Undrained Triaxial Test
SCHOOL OF CIVIL ENGINEERING AND CONSTRUCTION
FACULTY OF SCIENCE, ENGINEERING & COMPUTING
Geotechnical Engineering 1
LEVEL: 5 MODULE: CE2045
Quick Un-Drained Triaxial Test
Report Author: Keith
GROUP MEMBERS: Ahmed Ahmed K1034749 Villamar Rodriguez K0916719
DATE OF EXPERIMENT: 4 February 2013
* Table of Contents Page *
1 Introduction and Objectives 2
2 Experimental Results 7 2.1 Raw Results 7 2.2 Graph 8 2.3 Final Results 9
3 Analysis and Discussion 10 3.1 Meaning of Results 10
4 Conclusion 11
5 References 12
6 Appendices 13
Introduction & objectives
The Tri-Axial test is a widely practiced laboratory method commonly used for testing the shear strength parameters of different soil types under drained or un-drained conditions.
The Tri-axial test involves applying radial and axial stresses or displacements to a cylindrical sample of soil obtained from a particular site. The soil sample is enclosed in a thin rubber membrane and setup vertically between two rigid ends in the pressure chamber, which is then filled with de-aired water and then the axial stress applied gradually digitally.
The pressure within the chamber is controlled by the de-aired water surrounding the sample. The stress capacity of the soil sample within the chamber increases as cell pressure increases.
The volume change in the soil sample is also controlled by measuring the volume of moving water within the chamber.
There are three main types of tri-axial tests that can be carried out on soil samples, depending on the drainage conditions and loading:
Consolidated – Drained (CD) Consolidated – Undrained (CU) Unconsolidated - Undrained (UU)
The purpose of carrying out an Undrained tri-axial test is to determine the properties of different types of soils under varying strains and stresses. It is carried out to get a better
FACULTY OF SCIENCE, ENGINEERING & COMPUTING
Geotechnical Engineering 1
LEVEL: 5 MODULE: CE2045
Quick Un-Drained Triaxial Test
Report Author: Keith
GROUP MEMBERS: Ahmed Ahmed K1034749 Villamar Rodriguez K0916719
DATE OF EXPERIMENT: 4 February 2013
* Table of Contents Page *
1 Introduction and Objectives 2
2 Experimental Results 7 2.1 Raw Results 7 2.2 Graph 8 2.3 Final Results 9
3 Analysis and Discussion 10 3.1 Meaning of Results 10
4 Conclusion 11
5 References 12
6 Appendices 13
Introduction & objectives
The Tri-Axial test is a widely practiced laboratory method commonly used for testing the shear strength parameters of different soil types under drained or un-drained conditions.
The Tri-axial test involves applying radial and axial stresses or displacements to a cylindrical sample of soil obtained from a particular site. The soil sample is enclosed in a thin rubber membrane and setup vertically between two rigid ends in the pressure chamber, which is then filled with de-aired water and then the axial stress applied gradually digitally.
The pressure within the chamber is controlled by the de-aired water surrounding the sample. The stress capacity of the soil sample within the chamber increases as cell pressure increases.
The volume change in the soil sample is also controlled by measuring the volume of moving water within the chamber.
There are three main types of tri-axial tests that can be carried out on soil samples, depending on the drainage conditions and loading:
Consolidated – Drained (CD) Consolidated – Undrained (CU) Unconsolidated - Undrained (UU)
The purpose of carrying out an Undrained tri-axial test is to determine the properties of different types of soils under varying strains and stresses. It is carried out to get a better
References: 1. Head, K. H. (1982) Manual of soil laboratory testing, Vol 2 Plymouth: Pentech Press 2. BS EN 1377-8:1990 Methods of test for soils for civil engineering purposes – Part 8: Shear strength tests (effective stress) [Online] available from bsol.bsigroup.com 3. Triaxial test < http://www.geotechdata.info/geotest/triaxial-test> [Date Accesed: 11-03-2013] 4. Bishop, A. W. Henkel, D. J. (1957) The Measurement Of Soil Properties in The Triaxial Test, E. Arnold 5. Donaghe, R. T., Chaney, R. C., Silver, M. L. (1988) Advanced Triaxial Testing of Soil and Rock, STP 977, Illustrated, ASTM International. Appendices Fig 1: Test Equipment Fig 2: Prepared Soil Sample Fig 3: Soil sample after testing Fig 4: Weighing Soil Sample