Study on mechanical characteristics of dark green silty clay in Shanghai with disturbed state concept model

摘要

The dark green silty clay in Shanghai is a bearing stratum for pile foundation. Research on the mechanics characteristics of the stratum will provide with important significance both in theory and in practice. In this paper, a new constitutive model of saturated soft clay is established based on the disturbed state concept (DSC) theory. The mechanical characteristics of the dark green silty clay in Shanghai are studied using the consolidation-undrained triaxial shear tests under various confining pressure states. The relationship among axial stress, axial train and pore water pressure of the clay is obtained. The constitutive model of clay based on the DSC theory is verified by the test results. The disturbance of soil influencing on single pile set-Ilement is discussed by a numerical calculating example. The research shows that the proposed DSC constitutive model can describe the mechanics response of the stratum preferably.