Comparison of Undisturbed and Remolded Samples using Triaxial Equipment
by
Siti Aisyah Bt Yahya
Dissertation submitted in partial fulfillment of the requirements for the
Bachelor of Engineering (Huns)
Universiti Teknologi PETRONAS Bandar Seri Iskandar
31750Tronoh
Perak Darul Ridzuan.
(Civil Engineering)
JANUARY 2012
CERTIFICATION OF APPROVAL
Comparison of Undi11turbed and Remolded Samples using Triaxial Equipment
Tl.... 7
by
Siti Aisyah Bt Y ahya
A project dissertation submitted to the Civil Engineering Department Universiti Tcknologi PETRONAS in partial fulfillment of the requirement for the
BACHELOR OF ENGINEERiNG (Hons) (CIVIL ENGINEERING)
~ ~
(Dr. yed Baharom Azahar Syed Othman)
UNIVERSITI TEKNOLOGI PETRONAS TRONOH, PERAK
January 2012
CERTIFICATION OF ORIGINALITY
This is to certify that I am responsible for the work submitted in this project, that the original work is my own except as specified in the references and acknowledgements, and that the original work contained herein have not been undertaken or done by unspecified sources or persons.
(SITI AISY AH BT Y AHYA)
ABSTRACT
Geotechnical engineers or engineering geologist perlormed geotechnical investigation to obtain information on the physical properties of soil and rock around a site to design earthworks and foundations for proposed structures.
A wide variety of laboratory tests can be performed on soils to measure a wide variety of soil properties. Some soil properties are intrinsic to the composition of the soil matrix and are not affected by sample disturbance, while other properties depend on the structure of the soil as well as its composition, and can only be effectively tested on relatively undisturbed samples.
Triaxial shear tests is a type of test that is used to determine the shear strength properties of a soil. It can simulate the confining pressure a soil would see deep into the ground. It can also simulate drained and undrained conditions.
This aim of this research is to compare the soil strength characteristics between undisturbed and remolded samples by testing both samples using Triaxial Equipment.
Several undisturbed sample will be collected using specified soil samplers together with a sufficient amount of soil to be prepared into remolded samples in the laboratory. The undisturbed and remolded sample will then be tested using Unconsolidated Undrained Triaxial Test.
TABLE OF CONTENTS
CERTIFICATION ABSTRACT.
CHAPTER I: INTRODUCTION
1.1. Project Background 1.2. Problem Statements
1.3. O~ectives and Scope of Study.
CHAPTER2: LITERATURE REVIEW 2.1 Sample remolding 2.2 Triaxial Test
2.3 Soil Shear Characteristics 2.4 Review of Journals
CHAPTER3: METHODOLOGY
3.1 Project work.
3.2 Experimentation Operational Framework.
3.3 Result and Analysis.
CHAPTER4: RESULT AND DISCUSSION.
CHAPTERS: CONCLUSION 3.1 Conclusion.
3.2 Recommendation.
REFERENCES
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LIST OF FIGURES
Figure 2.1: Diagram of A Typical Triaxial Cell 4
Figure 2.2: The graphically presented Coulomb Strength Equation 6
Figure 3.1: Project Activities Flow 8
Figure 3.2: Experimental Framework 9
Figure 3.3: Disturbed samples taken from site 3, 4 and 5 10
Figure3.4: Hand auger 10
Figure 3.5: Undisturbed sample in steel tube taken using hand auger 10
Figure 3.6: Disturbed sample in oven 11
Figure 3.7: Disturbed sample is crushed into fme pieces using rubber hammer 11 Figure 3.8: Specimen is being weighed and put in oven 12
Figure 3.9: Sieve equipment 13
Figure3.1 0: The soil is being mixed with water using mixer 15
Figure 3.11: Sealed sample 15
Figure 3.12: Soil compaction 16
Figure 3.13: Compacted soil 16
Figure 3.14: Triaxial test mould is placed onto the compacted soil 17 Figure 3.15: Samples are wrapped and stored in a dessicator 17
Figure 4.1: Example of sheared sample (sample 3) 22
Figure 4.2: Shearing stage of Sample 4 UD (A) 22
Figure 4.3: Shearing stage of Sample 4 UD (A) 23
Figure 4.4: Shearing stage of Sample 4 UD (C) 23
Figure 4.5: Mohr Circle of Sample 4 UD 24
Figure 4.6: Shearing stage of Sample 4 R (A) 25
Figure 4.7: Shearing stage of Sample 4 R (B) 26
Figure4.8: Shearing stage of Sample 4 R (C) 26
Figure 4.9: Mohr Circle of Sample 4 (Remolded) 27 Figure 4.10: Shear strength of Sample 4 (Undisturbed and Remolded) 28 Figure 4.11: Shear strength of Sample 1 (Undisturbed and Remolded) 29 Figure 4.12: Shear strength of Sample 2 (Undisturbed and Remolded) 29 Figure 4.13: Shear strength of Sample 5 (Undisturbed and Remolded) 30 Figure 4.14: Shear strength of Sample 3 (Undisturbed and Remolded) 30
LIST OF TABLES
Table 3.1: Site locations which soil samples are taken 9 Table 3.2: Confining pressure applied to each specimens. 19
Table 4.1: Summary of basic test results 21
Table4.2: Conditions at failure of Sample 4 UD 24
Table 4.3: Shear strength properties of Sample 4 UD 25 Table 4.4: Conditions at Failure for Sample 4 (Remolded) 27
Table 4.5: Shear strength properties of Sample 4 28
Table4.6: Shear strength properties for undisturbed and remolded sample 31
