Effects of anisotropic consolidation of flow failure behavior of a silty sand

초록

A series of consolidated-undrained compression tests was performed to investigate the influence of the anisotropic consolidation on the flow failure behavior of a saturated loose sand. The specimens were formed initially at the relative desity of about 17% by the wet tamping method and consolidated with four different consolidation pressure ratios(Kc), 1.0, 0.7, 0.55, Ko. The test results show that the steady state line is a unique straight line on p'-q plane for all value of Kc. The relationship between the undrained residual strength(Sus) and the peak strength(Sp) of the loose slilty sand, showing the flow failure behavior, is found to be represented as a general equation, Sp/Pc'=AL+BL(Sus/Pc'), irrespective of the value of Kc. These coefficients, AL and BL, tend to vary linearly with the value of Kc.