A CD test was conducted on a sample of dense sand 38 mm in diameter x 76 mm long. The cell pressure was 200 kPa. The results are shown in the table below. Axial displacement (mm) Axial load (N) 0 0.3 0.6 1.0 1.3 1.6 1.9 3.2 5.2 128.1 225.9 338.9 451.8 508.3 564.8 604.3 593.0 576.0 564.8 525.2 497.0 480.0 6.4 7.1 9.7 12.9 15.5 (a) Using the data in the table, plot the Deviatoric stress (y-axis) against axial strain (x-axis) graph. (b) Using the graph from (a), draw the Mohr-circle at the peak (i.e., the maximum deviatoric stress). Determine the principal stresses as well. (c) Provided that the sample is sand, draw a failure envelope on the Mohr circle from (b) and determine the friction angle (0′).
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