USF Triaxial Strengthh of Soil Lab Report

Question Description

Undrained triaxial compression test (without pore water pressure measurement)

To determine the undrained shear strength of a soil using the triaxial compression test.

The apparatus consists of a cell, which is filled with water under pressure; the specimen is loaded vertically, via a proving ring to measure load.

Calculate the moisture content of the soil as per Appendix A.
Calculate the results as follows:

(i) For each sample tested:

Plot the Deviator stress (s₁–s₃) vs. strain.
Find the failure values of Deviator stress and strain when the Deviator stress hits a peak value; this is denoted as (s₁–s₃)_f and e_f; ensure you correct the Deviator stress for the membrane correction (Figure 11 in BS1377-7:1990).

(ii) Plot the Mohr circle for each of the samples.

(iii) Determine the apparent cohesion (c_u) and the angle of shearing resistance (f_u) of the soil by using the best common tangent method.

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