TUGAS BESAR MEKANIKA TANAH II TSI-61127

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TUGAS BESAR

MEKANIKA TANAH II

TSI-61127

NAMA : REDATUL HUSNA NO. BP : 2010921018

DOSEN : RINA YULIET, M.T

KELOMPOK KEAHLIAN GEOTEKNIK FAKULTAS TEKNIK UNIVERSITAS ANDALAS

PADANG

2022

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TUGAS BESAR MEKANIKA TANAH II

Oleh

Nama: REDATUL HUSNA No.BP: 2010921018 Asisten: GERI GUSHARDI

KELOMPOK KEAHLIAN GEOTEKNIK DEPARTEMEN TEKNIK SIPIL

FAKULTAS TEKNIK UNIVERSITAS ANDALAS

PADANG

2022

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Kelompok Keahlian Geoteknik

Departemen Teknik Sipil – Fakultas Teknik Universitas Andalas

Tugas Besar Mekanika Tanah II

Diketahui sebuah lereng dengan tinggi dan bentuk existing awal seperti pada gambar :

Dimana pada titik A akan dibangun diatasnya sebuah subgrade jalan selebar 10 meter, dengan dimensi dan bentuk rencana konstruksi sebagai berikut :

Parameter tanah :

•

Lapisan 1 (Lempung berpasir)

= =

= 19 kN/m

= 26,yx 

α = 62 º

E’ = 2500

v’ = 0,25

(5)

•

Lapisan 2 (Lempung berpasir )

•

Tanah Timbunan (Pasir berlempung)

Pertanyaan :

1. Periksalah kestabilan lereng pada :

a. Lereng 1 dengan menggunakan metoda bidang datar !

b. Lereng 2 dengan menggunakan metoda irisan (Fellinius dan Bishop) !

2. Hitunglah besar tegangan efektif dan gambarkan distribusi tegangan pada titik A,B,C dan D !

3. Hitunglah dengan menggunakan metoda Rankine !

a. Besar tekanan tanah lateral yang bekerja pada dinding penahan tanah

b. Besar tekanan tanah lateral pada dinding penahan tanah apabila diatas permukaan tanah bekerja beban terbagi rata sebesar q = 18,zx

= 54  = = =

=

= 26,zx  E’ = 2000 v’ = 0,25

➢ Kondisi kering = 1.yxz =

= = 35  E’ = 600 v’ = 0,3

➢ Kondisi jenuh = 1.xyz =

=

= 32 

E’ = 600

v’ = 0,3

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Redatul Husna (2010921018)

BAB III

ANALISIS KESTABILAN LERENG MENGGUNAKAN PLAXIS

Parameter Tanah

Material Moddel Model Mohr-Coloumb Mohr-Coloumb Mohr-Coloumb Linear Elastis -

Type of Behaviour Type Undrained (A) Drained Drained Non Pourus -

Berat Kering γ unsat 18 18 18.8 24 kN/m³

Berat Basah γ sat 18.11 18.11 20.5 24 kN/m³

Permeabilitas x kx 0.000001 0.000001 0,001 - m//d

Permeabilitas y ky 0.000001 0.000001 0,001 - m/d

Modulus Young E' 25000 20000 6000 14862705 kN/m²

Poison's Ratio v 0.25 0.25 0.3 0.3 -

Kohesi c 78.1 81.8 2 - kN/m²

Sudut Geser φ 26.81 26.11 35 - º

Dilatansi ψ 0 0 5 - º

Unit Parameter Symbol Lempung Berpasir 1 Lempung Berpasir 2 Timbunan DPT Gravity Wall

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Output Version 20.0.0.119

Project description

Project filename Step

Date

Company

Redatul Husna 2010921018 12/13/2022

Alfa 10 101 TB Mekanika Tanah II

Deformed mesh |u| (scaled up 0.500*10

^-3

times) Maximum value = 3570 m (Element 310 at Node 2473)

[*10³ m]

0 5 10 15 20 25 30 35 40 45 50 55

-4.00 0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 44.00

-12.00 -8.00 -4.00 0.00 4.00 8.00 12.00 16.00

(63)

Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

Total displacements |u| (scaled up 0.500*10

^-3

-4.00 0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 44.00

-8.00 -4.00 0.00 4.00 8.00 12.00 16.00

(64)

Project description : Alfa 10 Output Version 20.0.0.119 Company : TB Mekanika Tanah II

Project filename : Alfa 10

Output : Calculation information

Date : 12/13/2022 Page : 1

Step info

Phase Safety factor [Phase_1]

Step Initial

Calulation mode Classical mode

Step type Safety

Updated mesh False

Solver type Picos

Kernel type 64 bit

Extrapolation factor 1.000

Relative stiffness -0.05631E-12

Multipliers

Soil weight ΣM_Weight 1.000

Strength reduction factor M_sf -1.125E-3 ΣM_sf 10.29

Time Increment 0.000 End time 0.000

Staged construction

Active proportion total area M_Area 0.000 ΣM_Area 1.000

Active proportion of stage M_Stage 0.000 ΣM_Stage 0.000

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

Realised P_Excess,Max 90.78 kN/m²

(65)

Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

[*10³ m]

0 4 8 12 16 20 24 28 32 36 40

-3.00 0.00 3.00 6.00 9.00 12.00 15.00 18.00 21.00 24.00 27.00 30.00 33.00

-6.00 -3.00 0.00 3.00 6.00 9.00 12.00

(66)

Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

-2.50 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50 30.00 32.50

-5.00 -2.50 0.00 2.50 5.00 7.50 10.00 12.50

(67)

Date : 12/13/2022 Page : 1

Step info

Phase Safety factor [Phase_1]

Step Initial

Step type Safety

Updated mesh False

Solver type Picos

Kernel type 64 bit

Relative stiffness 0.01260E-12

Multipliers

Strength reduction factor M_sf 0.06353E-3 ΣM_sf 7.604

Staged construction

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

(68)

Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

times) Maximum value = 606.3 m (Element 755 at Node 5661)

[*10³ m]

0 2 4 6 8 10 12 14

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00

-4.00 -2.00 0.00 2.00 4.00 6.00 8.00 10.00

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Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

times) Maximum value = 606.3 m (Element 755 at Node 5661)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00

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Date : 12/13/2022 Page : 1

Step info

Phase Safety Factor [Phase_1]

Step Initial

Step type Safety

Updated mesh False

Solver type Picos

Kernel type 64 bit

Multipliers

Staged construction

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

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Kelompok Keahlian Geoteknik

Rekapitulasi:

Manual Plaxis

1 18 2.26 7.604

2 10 3.98 10.29

3 39 1.24 6.145

Percobaan Ke - Alfa SF

Kesimpulan:

Dari hasil perhitungan manual dan menggunakan software didapatkan hasil nilai

faktor keamanan berbeda. Dapat dilihat pada percobaan ke-2 dengan alfa 10º,

pada perhitungan manual didapat nilai SF = 3.98 sedangkan jika menggunakan

software nilai SF = 10.29. Jadi, untuk nilai faktor keamanannya Berbeda.

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Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

Stabilitas Lereng 1 TB Mekanika Tanah II

Deformed mesh |u| (scaled up 20.0 times)

Maximum value = 0.03135 m (Element 412 at Node 1695)

[m]

0 0.1 0.2 0.3 0.4 0.5 0.6

2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00

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Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

Total displacements |u| (scaled up 20.0 times) Maximum value = 0.03135 m (Element 412 at Node 1695)

2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00

0.00 2.00 4.00 6.00 8.00

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Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

[*10³ m]

0 4 8 12 16 20 24 28 32

-2.50 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50

-2.50 0.00 2.50 5.00 7.50 10.00 12.50

(75)

Project description

Date

Company

Redatul Husna 2010921018 12/13/2022

^-3

2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00

0.00 2.00 4.00 6.00 8.00

(76)

Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

Cartesian effective stress σ'

_xx

(scaled up 0.0100 times)

Maximum value = 0.1574 kN/m² (Element 1008 at Node 92) Minimum value = -78.60 kN/m² (Element 1304 at Node 11570)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

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Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

_yy

(scaled up 5.00*10

^-3

times)

[kN/m²]

-140.00 -130.00 -120.00 -110.00 -100.00 -90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00

0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50

-2.50 0.00 2.50 5.00 7.50 10.00 12.50

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Project description : Stabilitas Lereng Output Version 20.0.0.119 Company : TB Mekanika Tanah II

Project filename : Stabilitas Lereng Output : Calculation information

Date : 12/13/2022 Page : 1

Step info

Phase Cek Kondisi Exsisting [Phase_1]

Step Initial

Step type Safety

Updated mesh False

Solver type Picos

Kernel type 64 bit

Multipliers

Staged construction

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

(79)

Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

Sebelum Pembebanan 166 TB Mekanika Tanah II

Deformed mesh |u| (scaled up 20.0 times) Maximum value = 0.05170 m (Element 93 at Node 8402)

[m]

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

-2.50 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50

-2.50 0.00 2.50 5.00 7.50 10.00 12.50

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Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

Sebelum Pembebanan 166 TB Mekanika Tanah II

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

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Project description

Project filename

Date

Company

Redatul Husna 2010921018 12/14/2022

Sebelum Pembebanan TB Mekanika Tanah II

_xx

(scaled up 2.00*10

^-3

times)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

(82)

Project description

Project filename

Date

Company

Redatul Husna 2010921018 12/14/2022

Sebelum Pembebanan TB Mekanika Tanah II

_yy

(scaled up 0.500*10

^-3

times)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

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Project description : Sebelum Pembebanan Output Version 20.0.0.119 Company : TB Mekanika Tanah II

Project filename : Sebelum Pembebanan Output : Calculation information

Date : 12/14/2022 Page : 1

Step info

Phase Timbunan 2 [Phase_4]

Step Initial

Step type Plastic

Updated mesh False

Solver type Picos

Kernel type 64 bit

Relative stiffness 0.7207

Multipliers

Strength reduction factor M_sf 0.000 ΣM_sf 1.000

Staged construction

Active proportion total area M_Area 3.641E-3 ΣM_Area 1.000

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

(84)

Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

Setelah Pembebanan 175 TB Mekanika Tanah II

Deformed mesh |u| (scaled up 10.0 times)

Maximum value = 0.06386 m (Element 154 at Node 7466)

[m]

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

-2.50 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50

-2.50 0.00 2.50 5.00 7.50 10.00 12.50

(85)

Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

(86)

Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

_xx

(scaled up 2.00*10

^-3

times)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

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Project description

Date

Company

Redatul Husna 2010921018 12/14/2022

_yy

(scaled up 0.500*10

^-3

times)

Maximum value = 3.748 kN/m² (Element 203 at Node 7528) Minimum value = -869.6 kN/m² (Element 1080 at Node 11325)

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

-2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00

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Project description : Setelah Pembebanan Output Version 20.0.0.119 Company : TB Mekanika Tanah II

Project filename : Setelah Pembebanan Output : Calculation information

Date : 12/14/2022 Page : 1

Step info

Phase CeK dpt [Phase_6]

Step Initial

Step type Safety

Updated mesh False

Solver type Picos

Kernel type 64 bit

Relative stiffness -0.09121E-6

Multipliers

Staged construction

Forces

F_X 0.000 kN/m

F_Y 0.000 kN/m

Consolidation

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Kelompok Keahlian Geoteknik

Rekapitulasi :

Max Min Max Min

Kondisi Awal 4.532 0.157 -78.600 6.972 -136.000

DPT sebelum diberi beban 1.000 216.400 -224.500 1.005 -970.400 DPT setelah diberi beban 2.416 251.000 -239.700 3.748 -869.600 Tegangan Efektif (σ' x) Tegangan Efektif (σ' y)

Keadaan SF

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TIME SCHEDULE PENGERJAAN TUGAS BESAR MEKANIKA TANAH II

NO KEGIATAN DESEMBER

23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1 RESPONSI UMUM

2 RESPONSI KHUSUS 3 TAHAP 1

4 TAHAP 2 5 TAHAP 3 6 ACC JILID 7 PENGUMPULAN

RESPONSI UMUM RESPONSI KHUSUS PENGERJAAN WARNING ACC JILID

PENGUMPULAN LAPORAN HARI MINGGU