A series of CU compression tests on a simple clay (Ladd, 1964) provided the following test...

A series of CU compression tests on a simple clay (Ladd, 1964) provided the following test results:

(a) In an axial compression test, if σ'c = 200 kPa, determine (qf, pf, and p'f. (b) Find ɸ' and c'. A special lateral extension stress path test was conducted on this clay in which the decrease in lateral stress was exactly equal to the increase in axial stress; that is, -Δσ3= Δσ1. For this case, if σ'c = 400 kPa, determine Δσ1, q, p, p', and An (c) when the axial strain is 4% and (d) at failure.