EFFECTS OF SAMPLE DISTURBANCE ON STRENGTH AND CONSOLIDATION PARAMETERS OF SOFT CLAY

概要

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Statistical properties such as the mean value and the coefficient of variation of undrained shear strength and consolidation parameters of disturbed soils were investigated through laboratory testing. A series of unconfined compression tests and standard consolidation tests were performed on natural deposits of Kuwana clay. The values of consolidation yield stress, P_c, and compression index, C_c, become larger than the actual values for a range of the ratio of q_u values of disturbed samples to the undisturbed sample, q_u-ratio, being greater than 0.8,and vice versa for a range of q_u-ratio being smaller than 0.8. The effects of sample disturbance on coefficient of consolidation, c_v, coefficient of volume compressibility, m_v, and coefficient of permeability, k, are different for the range of consolidation pressure, p, up to p_c. Therefore, the q_u-ratio is affected only by these consolidation parameters, and is independent of I_p, P, aud q_u values. For the normally consolidated region, the c_v, m_v, and k values of remolded soil are about 70%, 40%, and 80% smaller than those of the undisturbed soil, respectively. The relationship between consolidation parameters and sample disturbance is given as a function of the q_u-ratio. A comprehensive procedure to obtain the statistical values of strength and consolidation parameters of undisturbed specimens from those of disturbed samples is presented.
社団法人地盤工学会の論文
1994-09-15