Earth and Environmentals Science

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IOP Conference Series

Earth and Environmentals Science

International Conference on Earth Science, Mineral, and Energy (ICEMINE)

212

Volume 212 -2018 11–12 October 2018 Yogyakarta, Indonesia

EDITOR Dr. Ir. Sutarto

The Open acces journal for conference proceedings Iopscience.org/jpcs

IOP Publishing

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IOP Conference Series: Earth and Environmental Science

PAPER • OPEN ACCESS

International Conference on Earth Science, Mineral, and Energy With the theme, “Harmonizing on Exploration, Extraction, and Conservation”

To cite this article: 2018 IOP Conf. Ser.: Earth Environ. Sci. 212 011001

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ICEMINE

IOP Conf. Series: Earth and Environmental Science 212 (2018) 011001

IOP Publishing doi:10.1088/1755-1315/212/1/011001

1

Preface

It has been twelve years Faculty of Mineral Technology Universitas Pembangunan Veteran Yogyakarta held an annual national or international conference on energy, mineral, and earth science. This year the conference was called International Conference on Earth Science, Mineral and Energy (ICEMINE) 2018 with the theme “Harmonizing on Exploration, Extraction and Conservation”. This conference was held on 11th October 2018 and hosted by the Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta.

Geological conditions of Indonesia contribute a lot of mineral and energy resources. On the other hand, Indonesia also has high risks of geological disasters. We all have the right to explore and extract the mineral and energy resources in the earth through technology, but also have to maintain the environmental impacts and carry out conservation. Therefore, in this conference, we invite all geologists, geophysicists, petroleum engineers, mining engineers, metallurgist, environment and geo-tourism geoscientist as well as earth science students from all parts of society and institution of the world to share their knowledge, experience and concepts, in order an explore, extract and conserve. We wish those three activities could develop in harmony.

Yogyakarta, 11 October 2018 Editor in Chief

Dr. Ir. Sutarto

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IOP Conference Series: Earth and Environmental Science

List of Committee and Editor ICEMINE 2018

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ICEMINE

1

LIST OF COMMITTEE AND EDITOR ICEMINE 2018 A. List of Committee

No Name 1 Dr. Ir. Suharsono, MT

2 Dr. Suranto, MT 3 Dr. Ir. Sutarto, MT

4 Dr. Johan Danu Prasetya, S.Kel., M.Si 5 Yohana Noradika Maharani, ST, M.Eng, Ph.D 6 Ir. Peter Eka Rosadi, MT

7 Ayu Utami, ST, MS

8 Allen Haryanto Lukmana, ST, MT 9 Heru Suharyadi, ST

10 Wiji Raharjo, S.Si, M.Sc 11 Dr. Ir. Barlian Dwinagara, MT 12 Ir. Sayoga Heru Prayitno, MT 13 Dr. Ir. Dedi Kristanto, MT 14 Dr. Ir. Joko Susilo, MT 15 Soraya Faranisya, ST

B. List of Editor

NAMES INSTITUTION EMAIL

1 Prof. Sari Bahagiarti, K. UPN ‘Veteran” Yogyakarta [email protected] 2 Dr. Arifudin idrus Universitas Gadjah Mada (UGM)

Yogyakarta [email protected]

3 Prof. Sismanto Universitas Gadjah Mada (UGM)

Yogyakarta [email protected]

4 Dr. Suharsono UPN ‘Veteran” Yogyakarta [email protected]

5 Dr. Suranto UPN ‘Veteran” Yogyakarta [email protected]

6 Dr. Waterman

Sulistyana UPN ‘Veteran” Yogyakarta [email protected]

7 Dr. Eko Teguh Paripurna UPN ‘Veteran” Yogyakarta [email protected] [email protected] 8 Dr. C.Prasetyadi UPN ‘Veteran” Yogyakarta [email protected] 9 Dr. Tedy Agung C. UPN ‘Veteran” Yogyakarta [email protected] 10 Dr. Johan Danu UPN ‘Veteran” Yogyakarta [email protected] 11 Dr. Yohana N. M. UPN ‘Veteran” Yogyakarta [email protected] 12 Prof. Bambang

Prastistho UPN “Veteran” Yogyakarta [email protected]

[email protected] 13 Prof. C. Danisworo UPN “Veteran” Yogyakarta [email protected] 14 Prof. D. Haryanto UPN “Veteran” Yogyakarta [email protected] 15 Prof. Sutanto UPN “Veteran” Yogyakarta [email protected] 16 Dr. Dedy Kristanto UPN ‘Veteran” Yogyakarta [email protected] 17 Dr. Burhannudin Nur Universitas Trisakti [email protected] 18 Dr. Nur Ali Amri UPN ‘Veteran” Yogyakarta [email protected]

19 Dr. Yatini UPN ‘Veteran” Yogyakarta [email protected]

20 Dr. Jatmika Setiawan UPN ‘Veteran” Yogyakarta [email protected],

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IOP Conference Series: Earth and Environmental Science

Peer review statement

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ICEMINE

1

Peer review statement

All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientiﬁc standards expected of a proceedings journal published by IOP Publishing.

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Preface

Papers

Disaster Management and Environmental Issues

Volume 212 2018

Previous issue Next issue

International Conference on Earth Science, Mineral, and Energy 11–12 October 2018, Yogyakarta, Indonesia

Accepted papers received: 14 November 2018 Published online: 31 December 2018

 

011001 OPEN ACCESS

International Conference on Earth Science, Mineral, and Energy With the theme,

"Harmonizing on Exploration, Extraction, and Conservation"

View article PDF Open abstract



List of Committee and Editor ICEMINE 2018



Peer review statement



Groundwater quality analysis in dry seasons in Panggang Cay, Kepulauan Seribu, Jakarta, Indonesia

A Cahyadi, H Fatchurohman and I A Riyanto View article PDF Open abstract



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Conservation zones in a cultural heritages area of Penanggungan Volcano, based on volcanic- hydrogeological assessment, Mojokerto Regency, East Java, Indonesia

S B Kusumayudha, Y O Putra and P Pratiknyo View article PDF Open abstract



Scenario based volcanic hazard assessment from ash dispersion

S Lee, J Y Lee, H A Son and Y N Maharani



Seismic hazard mitigation for Bengkulu Coastal area based on site class analysis

R Misliniyati, L Z Mase, A J Syahbana and E Soebowo View article PDF Open abstract



Geohazard assessment in Borobudur Temple area, Central Java, Indonesia

H Murwanto, Sutarto, A Purwoarminta and A Sulaksono View article PDF Open abstract



Mangrove ecotourism management at local community in Jangkaran, Kulonprogo, using hierarchy analysis

J D Prasetya, Y N Maharani and I Rahatmawati View article PDF Open abstract



Conservation of groundwater in Nglanggeran Area, Gunung Kidul District, Yogyakarta

C Prasetyadi, B Prastistho, A Rodhi, P Pratiknyo, M G Rachman, Y Rizkianto, Arhananta, I Arina and A Nugraha View article PDF

Open abstract

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Efficiency of sea shells and crab ahells waste as eco-friendly adsorbent for treating acid rock drainage

I M Pratiwi, H Suharyadi and M Fransisco



Microseismic research using coherence and cross-correlation in Depok, Sleman, Yogyakarta

W Raharjo, I R Palupi, N B Wibowo, V D Supriyono and A P Setiahadiwibowo View article PDF

Open abstract

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Energy and Mineral Resources

Assesing efectiveness of sodium metabisulfite for treatment of coal tar wastewater

W A Setiawan, H Astika, T Astuti, A K Putra, A Ayuningtyas and H H Bahti View article PDF

Open abstract



Indonesian Waste Management: Municipal Biowaste Inventory at Yogyakarta City in 2017

A Utami, I W Widiarti, R R D Asrifah, F A Astuti, D H Santosa, M Gomareuzzaman and A Sungkowo View article PDF

Open abstract



Designing of Municipal Solid Waste (MSW) treatment plant in Onggomertan Village, Yogyakarta

I W Widiarti and M R Sugiarto



Identification of slip surface based on geoelectrical dipole-dipole in the landslides

hazardous area of Gedangsari District, Gunungkidul Regency, Province of Daerah Istimewa Yogyakarta, Indonesia

Y Yatini and I Suyanto



Treatment of brackish groundwater by zeolite filtration in Sumur Tua Wonocolo, Kedewan, Bojonegoro, East Java

E Yogafanny, K O Yohan and A Sungkowo



The content of heavy metals in vegetables in the hydrothermal alteration rocks Boto Wonogiri Central Java

D F Yudiantoro, M Nurcholis, D Haryanto, D S Sayudi, A Suproborini and M Abdurrahman View article PDF

Open abstract



CO adsorption the numerical simulations and the controlling factors to low rank coal

A Rahim, S S Surjono and D H Amijaya 2

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Geology at Beruang Kanan, Central Kalimantan, Indonesia

R Anjarwati, A Idrus and L D Setijadji



An initial study to investigate generating hydrocarbon potential of Tertiary Coals from Balikpapan and Pulaubalang Formations in Lower Kutai Basin, East Kalimantan, Indonesia

M Dwiantoro and Sundoyo



Study of the optimization of gold ore concentration using gravity separator (shaking

table): case study for LS epithermal gold deposit in Artisanal Small scale Gold Mining (ASGM) Paningkaban, Banyumas, Central Java

R Ernawati, A Idrus and H T B M Petrus



Macrolithotype and gas content of shallow low-rank coal of Muaraenim Formation at Musi Banyuasin, South Sumatera Basin

V Fintaru, B Rahmad, J Setiawan, A A Dewa and M A Ibrahim View article PDF

Open abstract



Alteration mineral mapping to identify primary tin potential using Landsat 8 images and geographic information system in Rimba Kulit Area, Southern of Bangka Island

Franto, Subagyo Pramumijoyo and Lucas Donny Setijadji View article PDF Open abstract



Mineralization study of Bukit Sambunggiri with the approach of geological and petrogenesys methods in Merawang Subdistrict, Bangka Regency

Guskarnali and Mardiah



Characteristics and distribution of gold in intermediete sulfidation deposit at Cipanggleseran, Banten, Indonesia

W Hidayat, Sutarto and Sutanto

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Copper resource estimation in PT X Batu Hijau, Regency of West Sumbawa, West Nusa Tenggara Province using geostatistical method

I Marwanza, C Nas, S P Badaruddin and M A Azizi View article PDF Open abstract



The alteration characteristic of Cu-Au skarn and porphyry-style alteration in The Deep Mlz, Ertsberg District, Papua, Indonesia

M Meirawaty, R A Furqan, S D Nuryana and A Yani View article PDF Open abstract



Regional tectonic and geochemical approach to distinguish bauxite characteristics in Pahang, Malaysia and West Kalimantan, Indonesia

R D Nugraheni, D Sunjaya and S Agustini



Characteristic of low rank coal from Warukin Formation, South Kalimantan and their implication for coal liquefaction

E Nursanto and A Ilcham



Epithermal Cu-Pb-Zn mineralization in the Cidolog Area, Sukabumi Regency West Java Province, Indonesia

H S Purwanto, Suharsono and A Puntadewa



The effect of coal petrology on the capacity of gas methane absorption in coal formation Tanjung Barito in Binuang Region, South Kalimantan

S Raharjo, S Bahagiarti, H S Purwanto and B Rahmad View article PDF Open abstract



Coal porosity and coal microscopic characteristic for coalbed methane (CBM) analysis of the Warukin Formation in Barito Basin, Idamanggala, Hulu Sungai Selatan, South Kalimantan

B Rahmad, S Raharjo, Ediyanto and E W Pramudiohadi View article PDF Open abstract

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Geological Engineering

Geological Sciences

Possible generation and existence of quartz veins at Cisolok Geothermal Area

U Sumotarto, F Hendrasto, M Meirawati and I H P Hasibuan View article PDF

Open abstract



Evaluation of coking properties bituminous medium volatile coal, Batu Ayau Formation, Kutai Basin, Central Kalimantan

D Tanggara, D H Amijaya and S S Surjono



Geochemical characterization of Kutai Basin coals using proximate and ultimate analysis

A Winarno, D H Amijaya and A Harijoko



Slope stability analysis in Lusi River, Kedungrejo using limit equlibrium method

D E Aryanti, O N Eveny, A Tulus and S Saptono View article PDF Open abstract



Three dimensional slope stability analysis of open pit limestone mine in Rembang District, Central Java

M A Azizi, I Marwanza, S A Amala and N A Hartanti View article PDF Open abstract



Support system analysis in building diversion tunnel ST1-ST4 of Leuwikeris dam construction at West Java Province

R H Prakoso and S Rachman



Stope stability analysis of limestone ex-mined area at Ponjong sub-district Special Region of Yogyakarta using finite element method

F Sariandi, G V Putra, G V Setyorini and S Saptono View article PDF Open abstract

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Diversity model of Pliocene-Pleistocene nannofossil of Kendeng Zone

S U Choiriah, C Prasetyadi, R Kapid and D F Yudiantoro View article PDF Open abstract



Textural analysis and crystal size distribution of plagioclase from Ciremai's a'ā lava:

Interpretation magmatic processes and crystallization time

W N Hamzah, I A Kurniawan, M Abdurrachman, I G B E Sucipta and M E Suparka View article PDF

Open abstract



Mineralogy and geochemistry of clays from Malaysia and its industrial application

A Hussin, A H A Rahman and K Z Ibrahim



Revealing granitic basement of Garba Hill, Muara Dua Region, South Sumatera based on landsat images, structure, and petrography

Idarwati, H S Purwanto, E Sutriyono and C Prasetyadi View article PDF Open abstract



Phenomenon of schistic breccia, autoclastic breccia and radiolarian chert, a Mesozoic

tectonic trace in Bantimala Tectonic Complex Area, Pangkep Regency South Sulawesi Province

Kaharuddin, A M Imran, C I Abdullah and A Jaya View article PDF Open abstract



Miocene tectonic of the Southeast Arm of Sulawesi, Indonesia: Based on petrology data, geochemistry, and Ar/ Ar geochronology of metamorphic rocks from Rumbia Complex

M Mawaleda, J R Husain, M Forster, E Suparka, C I Abdullah, N I Basuki and J Hutabarat

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

Conceptual model and recharge area of geothermal system in Gede-Pangrango and Pancar based on geochemical and hydrogeology

H C Natalia and N R Herdianita

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New nomenclature of Mt. Penanggungan stratigraphy, Pasuruan and Mojokerto Regency, East Java

E T Paripurno, G Pradhana, W Putra and G P Hartono View article PDF Open abstract



Inventory of geoheritage of the Muria Peninsula to develop geotourism

B Prastistho, Z Umam and Y A Rahadian



The potential of Negeri Atas Angin Geosite Bojonegoro

M N Setiawan, D Kristanto and J Setiawan



Rock types characteristics of Prambanan and Sambisari Temples, Yogyakarta Province, Indonesia

Sutarto, S B Kusumayudha, H Murwanto and S Faranisya View article PDF Open abstract



Opak fault: a comparative review

A Sutiono, B Prastistho, C Prasetyadi and Supartoyo View article PDF Open abstract



The evolution of Sidoarjo hot mudflow (Lusi), Indonesia

H T Wibowo, B Prastisho, C Prasetyadi and D F Yudiantoro View article PDF Open abstract



Morphotectono-volcanic of Tertiary volcanic rock in Kulon Progo mountains area, Yogyakarta-Indonesia

A Widagdo, S Pramumijoyo and A Harijoko



Tectonostratigraphy-volcanic of Gajah-Ijo-Menoreh Tertiary volcanic formations in Kulon Progo mountain area, Yogyakarta-Indonesia

A Widagdo, S Pramumijoyo and A Harijoko

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Geothermal

Mining Engineering

The estimation of potential heatloss based on thermal geochemical data in the Mount Pancar, Bogor, West Java Province

R Deandra and F Hendrasto

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Data integration: feed zone, temperature and material corrosion rate in the planning of production casing and liner completion in geothermal wells

Sudarmoyo

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Overview of the petrophysical and geochemical properties of the Ungaran Quarternary Volcano in relation to geothermal potential

D F Yudiantoro, D R Ratnaningsih, E W Pramudiohadi, A G B Kurnianto, D G Alfian, Arhananta and M Abdurrahman



Kriging by partition: case of Ciurug Quartz Gold Vein

N A Amri, Hartono and H T Siri



Determination of temporary support for squeezing zone underground mine PT. Cibaliung Sumberdaya

R Anggara and B Dwinagara



Dynamic discount rate through Ornstein-Uhlenbeck process for mining project valuation

A Ardian and M Kumral

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Weighted jackknife ordinary kriging - problem solution of the precision in mineral resources estimation

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Influence of drain hole inclination on drainage effectiveness of coal open pit mine slope

T A Cahyadi, L E Widodo, R A Fajar and A Baiquni View article PDF Open abstract

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Analysis of temporary support effectiveness in very softrock tunneling at Cisumdawu's Tunnel

O N Eveny, D E Aryanti, M Rusdiana and S Saptono View article PDF Open abstract

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The rock fragmentation control in long hole blasting – case study Antam Pongkor underground gold mine

T Fadillah

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Natural draining model on sandy clay loam soil above impermeable layer in mining over burden disposal

R A Fajar, L E Widodo, T A Cahyadi and A Rinaldi View article PDF Open abstract

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Effect double-primer placement for improving the fragmentation on harder material in stemming column: a case study

M R Ipmawati, D R Nainggolan, B Wiyono and R Sunarya View article PDF Open abstract

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Correlation between uniaxial compressive strength (UCS) and blasting geometry on rock excavation at PT Agincourt Resources

D R Nainggolan, R Sitorus, O N Eveny and F Sariandi View article PDF Open abstract



Blasting, fragmentation and wall quality result at West Wanagon slope stability project on Grasberg Mine

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Petroleum Engineering and Petroleum Geosciences

A review of soft computing application in mineral resources engineering

L E Widodo



Analysis of the double-tunnels interaction by using finite element method: influence of tunnels position and excavation sequence

M R Yulianto, S Saptono, D P Utomo and S O Bernadeht View article PDF Open abstract

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Validation of shale brittleness index calculation from wireline log of well BETRO-001 by using XRD test results and uniaxial test as parameters for determining potential of shale hydrocarbon - brown shale of Pematang Group Formation, Central Sumatra Basin, Bengkalis Trough

A Buntoro, C Prasetyadi, R A Wibowo, Suranto and A H Lukmana View article PDF

Open abstract

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Sensitivity analysis in using of artificial neural network models to determine infill well locations in a mature oil field

M T Fathaddin, M I Arshanda, Y A Rachman, E A P Putra, A Nugrahanti and S Kasmungin View article PDF

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Electro telluric resonance logging

A Guntoro and Sardjono

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Discover of GWLI as chemical flooding using SIT: experiment and analysis on key influence factor for oil recovery improvement

M Naser, M Erhayem, A Hegaig, M Abobakr, B Abobakr and A Masood View article PDF

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Waterflooding surveillance: real time injector performance analysis using Hall plot method & derivative

D R Ratnaningsih and I L Danny

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Anisotropic properties identification of Naintupo Formation, Tabul Formation and

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I S Ronoatmojo and M Burhannudinnur

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Influence of middle phase emulsion and surfactant concentration to oil recovery using SLS surfactant synthesized from bagasse

R Setiati, S Siregar, T Marhaendrajana and D Wahyuningrum View article PDF

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Effect of dissolved silica on stability of Hydrolyzed polyacrylamide in the Polymer injection

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Quick analysis of prediction using TCD (triple combo decline)

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Effectivity additives of baggase, ash straw, and sawdust wood albasia to compressive strength drilling cement

L Yunita and A I Irmaya

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Influence of temperature pyrolysis and biomass size particles on characterization of bio oil derived fromPinus Merkusii flower

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IOP Conference Series: Earth and Environmental Science

Three dimensional slope stability analysis of open pit limestone mine in Rembang District, Central Java

To cite this article: M A Azizi et al 2018 IOP Conf. Ser.: Earth Environ. Sci. 212 012035

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ICEMINE

1

Three dimensional slope stability analysis of open pit limestone mine in Rembang District, Central Java

M A Azizi¹, I Marwanza ^1,S A Amala¹, N A Hartanti¹

1Mining Engineering Department Universitas Trisakti Jalan Kyai Tapa No.1, Grogol, West Jakarta, Indonesia.

*corresponding author: [email protected]

Abstract. PT X is a limestone mine located in the district of Rembang, Central Java, which plans to expand and dig deeper. To ensure that the slope is stable, geotechnical study is needed.

However, if it is done in 2 dimensional (2D) the result might not always be representative. This research was conducted to determine the stability of single slope using three dimensional limit equilibrium method (3D LEM). The data was collected by doing geotechnical mapping of the drill core sample and conducting laboratory test of rock samples, i.e. the test of physical and mechanical properties of rocks. The result shows that there is a significant difference between 2D and 3D FoS. The volume of sliding is also presented.

Keywords : Factor of Safety, 3D Limit Equilibrium Method, Volume of failure, Limestone.

1. Introduction

Risk of slope failure is the multiplication between the failure probability (FP) against the consequences (avalanche volume, damage/loss of equipment or company assets, rehabilitation costs, fatality rate, and environmental damage). Risk management needs to be done to ensure that the potential risks of a mining operation can be controlled and measured. Research related to avalanche risk has been carried out by [9];

[15]; [17]; [16]; [18]; [10]; [11]; [12]; [7]; and [14]. If we want to reduce the risk the only key is actually at the FP itself. The higher the FP, the higher the risk.

In an overall slope design, PT X’s limestone mine, in Rembang district, Central Java Province requires a stable and optimum single slope design. By using rock mass strength data acquired from geotechnical structural mapping in drilling activities the slope can then be assessed. Before analyzing the overall slope, the single slope must first be confirmed stable because if it is not stable, the overall slope must not stable either.

These days the needs and pressure to analyze a slope 3 dimensionally is more sounds. This is because 2D analysis assumes that the width of slope is infinitely wide so then it neglects 3D effect. [5] stated that in most of the cases the width to height ratio is not sufficiently long and varies perpendicular to the slide movement.

Therefore, 3D analysis is considered important to be done to produced the representative FoS. Moreover, in 3D analysis the volume of failure can also be estimated while 2D analysis cannot. If the volume can be determinated, it can be useful as one of the considerations in giving failure prevention recommendation.

One of the most common methods usually used to analyze the stability of slopes is limit equilibrium method (LEM). In this research, the FoS of those lithologies were calculated with various angles of single

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ICEMINE

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slope so the optimum single slope could be determined. The analyzes were done in 2D and 3D. The comparison between 2D and 3D result of this research makes the need for 3D analysis more felt.

2. Methodology

2.1. 3D Limit Equilibrium Method

In 2D analysis a mass failure is defined based on the slip surface line in a sectional slope that will be divided into slices. Unlike 2D analysis, in 3D analysis a mass failure is discretized into columns. 3D LEM method is actually the extended formula from 2D LEM methods (Bishop, Janbu, Morgenstern-Price) in 2 orthogonal directions. [6] introduced the extended formula of Morgenstern-Price for 3D analysis that was also reduced to Bishop and Janbu methods. The formulations below are the summarized formulations of Bishop method reduced from Morgenstern-Price method used in this research to get the 3D FoS. Futher details about the derivations of it can be directly referenced in [6].

𝑎_𝑖= tan⁻¹{sin 𝜃_𝑖⁄[cos 𝜃_𝑖+ (cos 𝑎_𝑦𝑖⁄tan 𝑎′ cos 𝑎_𝑥𝑖)]} (II.1)

𝜃_𝑖= cos⁻¹{sin 𝑎_𝑥𝑖∙ sin 𝑎_𝑦𝑖} (II.2)

𝐹_𝑚𝑦=_∑(𝑊 ^∑{{𝐾^𝑦𝑖^[𝑓^1𝑖^𝑅𝑍^𝑖^+𝑓^3𝑖^𝑅𝑋^𝑖^]}}

𝑖+𝑃_𝑣𝑖)𝑅𝑋_𝑖+∑ 𝑁_𝑖(𝑔_1𝑖𝑅𝑍_𝑖−𝑔_3𝑖𝑅𝑋_𝑖) (II.3)

𝐹_𝑚𝑥= ^∑{{𝐾^𝑥𝑖^[𝑓^2𝑖^𝑅𝑍^𝑖^+𝑓^3𝑖^𝑅𝑌^𝑖^]}}

∑(𝑊_𝑖+𝑃_𝑣𝑖)𝑅𝑌_𝑖+∑ 𝑁_𝑖(𝑔_2𝑖𝑅𝑍_𝑖−𝑔_3𝑖𝑅𝑌_𝑖) (II.4)

𝐹_𝑚𝑧=^∑[𝐾_{∑ 𝑁(𝑔}^𝑧𝑖^(𝑓^2𝑖^𝑅𝑋^𝑖^−𝑓^3𝑖^𝑅𝑌^𝑖^)]

2𝑖𝑅𝑋_𝑖−𝑔_1𝑖𝑅𝑌_𝑖) (II.5)

𝐾_𝑦𝑖=^{𝐶^𝑖^+[(𝑊^𝑖^+𝑃^𝑣𝑖^{) (𝑔}^⁄ ^3𝑖^−𝑈^𝑖⁾^{] 𝑡𝑎𝑛 𝜙}^𝑖^}

1+(𝑓3𝑖𝑡𝑎𝑛 𝜙𝑖⁄𝑔3𝑖𝐹𝑚𝑦) (II.6)

𝐾_𝑥𝑖=^{𝐶^𝑖^+[(𝑊_1+(𝑓^𝑖^+𝑃^𝑣𝑖^{) (𝑔}^⁄ ^3𝑖^−𝑈^𝑖⁾^{] 𝑡𝑎𝑛 𝜙}^𝑖^}

3𝑖𝑡𝑎𝑛 𝜙_𝑖⁄𝑔_3𝑖𝐹_𝑚𝑥) (II.7)

𝐾_𝑧𝑖=^{𝐶^𝑖^+[(𝑊_1+(𝑓^𝑖^+𝑃^𝑣𝑖^{) (𝑔}^⁄ ^3𝑖^−𝑈^𝑖⁾^{] 𝑡𝑎𝑛 𝜙}^𝑖^}

3𝑖𝑡𝑎𝑛 𝜙_𝑖⁄𝑔_3𝑖𝐹_𝑚𝑧) (II.8)

𝑛_𝑖= {^{± tan 𝑎}^𝑥𝑖

𝐽 ,^{± tan 𝑎}^𝑦𝑖

𝐽 ,¹

𝐽} = {𝑔₁, 𝑔₂, 𝑔₃} (II.9)

𝑠_𝑖= {

sin(θ𝑖−𝑎𝑖)∙cos 𝑎_𝑥𝑖

sin θ𝑖 ,^{sin 𝑎}^𝑖^{∙cos 𝑎}^𝑦𝑖

sin θ𝑖 ,

sin(θ𝑖−𝑎𝑖)∙sin 𝑎_𝑥𝑖+sin 𝑎𝑖∙sin 𝑎𝑦𝑖 sin θ_𝑖

} = {𝑓₁, 𝑓₂, 𝑓₃} (II.10)

𝐽 = √tan²𝑎_𝑥𝑖+ tan²𝑎_𝑦𝑖+ 1 (II.11)

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ICEMINE

3

Where Ni, Ui = effective normal force and pore pressure force on column base; Si = mobilized shear force on column base; ai = space shear angle; a’ = projected shear angle; Ei = intercolumn normal force; Xi = intercolumn vertical shear forces; Hi = intercolumn horizontal shear forces; Pvi = vertical external force; RXi, RYi, RZi = lever arms; Wi = column weight; ni, si = unit vectors

The direction of sliding (ai) can be determined by changing the projected shear angle (a’) with certain interval until Fmx, Fmy, and Fmz values become the same as each other.

3. Data Analysis

Data collection’s location of material properties in 3D single slope stability analysis is at PT X, Rembang village, Central Java Province. The data were obtained from geotechnical drilling activities by using rock mass characterization method. In obtaining strength parameters in the calculation of RMR, a uniaxial compressive strength test was carried out with a sample in the form of core HQ, to determine the unit weight value of the physical properties and to determine the strength of intact rock using uniaxial compressive strength test and triaxial compressive strength test because the limestone in that location is categorized as primary limestone. The geometry of the single slope was 4,67 m berm long, 10 m in height, 10 m in width and slope angles 60⁰, 65⁰, 70⁰, 75⁰, and 80⁰. Material properties for high grade are unit weight 20.6 kN/m³, cohesion 170 kPa, internal friction angle 53.0 degrees and tensile strength 2500 kPa and for low grade unit weight 20.5 kN/m³, cohesion 120 kPa, internal friction angle 46.9 degrees and tensile strength 2250 kPa. For 2D analysis, the results were adopted from [13].

Figure 1. 3D LEM Slope Stability Analysis Result.

Table 1. 2D and 3D Analysis Result.

Lithology Slope Angle (°) 2D FoS

(Prakoso, 2018) 3D FoS

HG

60 6.36 7.796

65 5.87 7.493

70 5.41 7.088

75 4.97 6.5

80 4.49 6.536

LG

60 4.64 5.696

65 4.3 5.326

70 3.98 5.08

75 3.63 4.806

80 3.28 4.761

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4

Figure 2. 2D and 3D FoS Trendlines Between FoS and Slope Angles Variety.

Based on Table 1, in every simulation the slope is stable though the slope angle has been increased to 80°.

Therefore, the optimum single slope angle is determined. Both 2D and 3D analysis results show declining trends. The FoS also tends to be smaller with the increasing slope angle.

As seen in the result before, the 2D analysis produced smaller FoS than 3D analysis. This shows that the 3D effect really affects the FoS because the difference between 2D and 3D FoS is significant. This results support the past researches that stated 3D FoS is higher than 2D FoS that was summarized by [2] and [1] and stated in [8]. The only researches that stated 3D FoS is smaller than 2D FoS are Hovland (1977), Chen dan Chameau (1983), Thomaz and Lovell (1988), dan Seed, dkk. (1990), but in those researches there were significant potential inaccuracies involved as stated in Albataineh (2006) and Akhtar (2011).

Figure 3. Slope Angle and Volume of Sliding Chart.

Figure 9 shows that the volume of sliding decreases along with higher slope angle, because of the circular slip surface or area which affected by the slide gets smaller.

4. Conclusion

a. The optimum single slope angle for each lithology is at 80° with 3D HG FoS and 3D LG FoS value 6.536 and 4.761 respectively.

b. 3D FoS is found to be higher than 2D FoS in LEM and it is because of the existence of 3D effect that affects the FoS. The difference between 2D and 3D FoS is also significant. Thus, 2D analysis is not always representative.

c. The estimated volume of sliding generated from 3D LEM for HG and LG are 181 m³ and 163 m³ respectively with the trends go downward.

References

[1] Akhtar K 2011 Three Dimensional Slope Stability Analyses For Natural and Manmade Slopes, University of Illinois

[2] Albataineh N 2006. Slope Stability Analysis Using 2D and 3D Methods, University of Akron 3

4 5 6 7 8 9

60 65 70 75 80

FoS

Slope Angle (°)

2D HG FoS 2D LG FoS 3D HG FoS 3D LG FoS

50 100 150 200 250 300 350

60 65 70 75 80

Volume (m3)

Slope Angle (Degree)

HG LG

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5

[3] Amala S A 2018. Analisis Kestabilan Lereng Tunggal 3D Berdasarkan Hasil Kekuatan Batuan Utuh dan Massa Batuan Batugamping PT OMYA Indonesia Tahunan, Rembang, Jawa Tengah, Universitas Trisakti

[4] Bishop A W 1955 The Use the Slip Circle in the Stability Analysis of Slopes, Geotechnique, Vol 5, No. 1, pp 7-17

[5] Chakraborty A and Goswami D 2018 Three-Dimensional (3D) Slope Stability Analysis Using Stability

Charts, International Journal of Geotechnical Engineering.

https://doi.org/10.1080/19386362.2018.1465743

[6] Cheng Y M and Yip C J 2007 Three-Dimensional Asymmetrical Slope Stability Analysis Extension of Bishop’s, Janbu’s, and Morgenstern–Price’s Techniques, ASCE Journal of Geotechnical and Geoenvironmental Engineering, 133(12), 1544–1555. https://doi.org/10.1061/(ASCE)1090- 0241(2007)133:12(1544)

[7] H A Ardhi, Masagus Ahmad Azizi, Irfan Marwana, Pancanita N Hartami, Bani Nugroho 2017 Perbandingan Analisis Stabilitas Lereng Metode Kesetimbangan Batas Dengan Metode Elemen Hingga Menggunakan Pendekatan Probabilistik, Seminar Nasional Geomekanika 4 (SNG4) Padang, pp 179-185

[8] Hartanti N A 2018 Analisis Kestabilan Lereng Batugamping PT OMYA Indonesia, Rembang, Jawa Tengah Menggunakan Metode Kesetimbangan Batas Pada Software Slide3, Universitas Trisakti [9] M A Azizi dan Rr Harminuke Handayani 2011 Karakterisasi Parameter Masukan Untuk Analisis

Kestabilan Lereng Tunggal (Studi Kasus Di PT. Tambang Batubara Bukit Asam Tbk. Tanjung Enim, Sumatera Selatan), AVOER 2011, Fakultas Teknik Universitas Sriwijaya

[10] M A Azizi, S Kramadibrata, R K Wattimena, I D Sidi 2013 Characterization of the distribution of physical and mechanical properties of rocks at the Tutupan coal mine, South Kalimantan, Indonesia, EUROCK 2013 - Rock Mechanics for Resources, Energy & Enviroment pp 213-216

[11] M A Azizi, S Kramadibrata, R K Wattimena, I D Sidi 2013 Probabilistic Analysis of Physical Models Slope Failure, Procedia Earth and Planetary Science 6, pp 411-418

[12] M.A. Azizi, S. Kramadibrata, R K Wattimena, I D Sidi 2014 Risk Assessment Of Open Pit Slope Design At PT Adaro Indonesia, Indonesian Mining Journal 17 (3), pp 113-121

[13] Prakoso G 2018 Analisis Kestabilan Lereng Dengan Metode Kesetimbangan Batas Berdasarkan Hasil Pemetaan Geoteknik Sampel Batuan Inti Batugamping di PT OMYA Indonesia, Sale, Rembang, Jawa Tengah, Universitas Trisakti

[14] R A Abdullah, Dedy Yusufianshah, Mohd Asmawisham Alel, Siti Nurafida Jusoh, Mohd Azril Hezmi, Nor Zurairahetty Mohd Yunusand, Ahmad Nazri Ali, Masagus Ahmad Azizi 2018 Slope Stability Analysis Of Quarry Face at Karang Sambung District, Central Java, Indonesia, International Journal Of Civil Engineering & Technology (IJCIET) 9 (1) pp 857-864

[15] R K Wattimena, S Kramadibrata, I D Sidi, I Arif, M A Azizi 2012 Probabilistic Analysis of Single Bench Using New Slope Stability Curves, ISRM Regional Symposium-7th Asian Rock Mechanics Symposium

[16] R K Wattimena, S Kramadibrata, I D Sidi, M A Azizi 2013 Developing coal pillar stability chart using logistic regression, International Journal of Rock Mechanics and Mining Sciences 58 pp 55-60 [17] S Kramadibrata, R K Wattimena, I D Sidi, M A Azizi, Y Adriansyah 2012 Open Pit Mine Slope

Stability and Uncertainty, ISRM Regional Symposium-7th Asian Rock Mechanics Symposium [18] S Kramadibrata, R K Wattimena, M A Azizi, Y Wicaksana, I D Sidi 2013Physical modeling and

simulation of slope failure by means of centrifuge acceleration, ISRM International Symposium- EUROCK 2013

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SIMILARITY CHECK

(28)

Three dimensional slope stability analysis of open pit limestone mine in Rembang

District, Central Java

by Masagus Ahmad Azizi

Submission date: 03-Jun-2021 09:06AM (UTC+0700) Submission ID: 1599368624

File name: Three_dimensional_full.pdf (643.79K) Word count: 2262

Character count: 11493

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Three dimensional slope stability analysis of open pit limestone mine in Rembang District, Central Java

ORIGINALITY REPORT

PRIMARY SOURCES

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Submitted to School of Business and Management ITB

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1 Indikasi Plagiasi 2 Linearitas

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2 Ruang Lingkup dan kedalaman

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4 Kelengkapan unsur dan kualitas

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60% 9,00

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Jabatan/Pangkat :Kepala Lab. Eksplorasi Tambang/ Pembina utama Madya LEMBAR

HASIL PENILAIAN SEJAWAT SEBIDANG ATAU PEER REVIEW KARYA ILMIAH PROSIDING

Three Dimensional Slope Stability Analysis of Open Pit Limestone Mine in Rembang District, Central Java

Masagus Ahmad Azizi* (First Author merangkap Corresponding Author/Penulis Pertama merangkap penulis korespondensi)

Irfan Marwanza S. A. Amala N. A. Hartanti

: IOP Conference Series: Earth and Environmental Science : Volume 212

: Oktober 2018

Tempat pelaksanaan :

: IOP Publishing Jumlah halaman

https://iopscience.iop.org/article/10.1088/1755- 1315/212/1/012035/meta

URAIAN/KOMENTAR PENILAIAN , 21 %

linear Isi nilai pada shading kuning berikut ini

KOMPONEN YANG DINILAI

NILAI MAKSIMAL

NILAI AKHIR yang diperoleh

Kontribusi pengusul (Penulis

tunggal/pertama/korespondensi/anggota )*

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(42)

Judul Artikel Ilmiah :

Penulis Artikel Ilmiah : 1.

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e. Penerbit

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g. Tautan

Kategori Publikasi Artikel : Prosiding Internasional terindeks pada Scimagojr dan Scopus (maks 30)

 Prosiding Ilmiah Internasional Internasional terindeks pada SCOPUS, IEEE Explore, SPIE (maks 25) Prosiding Ilmiah Internasional tidak dipublikasikan (maks 15)

Prosiding Forum Nasional dipublikasikan (maks 10) Prosiding Forum Nasional tidak dipublikasikan (5)

No ASPEK

1 Indikasi Plagiasi 2 Linearitas

Internasional

bereputasi Internasional dipublikasikan

Internasional tidak dipublikasikan

Nasional

dipublikasi kan Nasional tidak dipublikasi kan 1 Kelengkapan dan kesesuaian unsur isi

jurnal 10% 2,5 2

pembahasan 30% 7,5 6

data/informasi dan metodologi 30% 7,5 6

4 Kelengkapan unsur dan kualitas penerbit 30% 7,5 7

Total 100% 25 21

60% 12,60

*) pilih salah satu

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pembahasan Baik

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21%

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KOMPONEN YANG DINILAI

NILAI MAKSIMAL

NILAI AKHIR yang diperoleh

Kontribusi pengusul (Penulis

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Jakarta, Desember 2020 Penilai Tempat pelaksanaan

Jumlah halaman

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Irfan Marwanza S. A. Amala N. A. Hartanti

: IOP Conference Series: Earth and Environmental Science : Volume 212

: Oktober 2018

: IOP Publishing :

LEMBAR

HASIL PENILAIAN SEJAWAT SEBIDANG ATAU PEER REVIEW KARYA ILMIAH PROSIDING

Three Dimensional Slope Stability Analysis of Open Pit Limestone Mine in Rembang District, Central Java

Masagus Ahmad Azizi* (First Author merangkap Corresponding Author/Penulis Pertama merangkap penulis

Earth and Environmentals Science

IOP Conference Series