Test research on deformation and strength properties of soft clay under special stress path

By conducting the conventional triaxial drained shear test,K0 consolidation axial loading shear test and K0 consolidation lateral unloading drained shear test,we simulate the real stress paths of soil body at lateral parts of foundation pit and analyze the deformation and strength properties of the soil under the above three different stress paths.The results show that: under the 3 testing stress paths,the principle stress differences of the failure of soft clay increase with consolidation confining pressure linearly;the deformation and strength properties of soft clay under lateral unloading stress path are distinct with conventional triaxial drained shear test;compared with condition of consolidation isotropically drained shear test,cohesion is reduced and angle of internal friction increases under K0 consolidation condition.The results have theoretical meanings for foundation pit design,and the soil parameters that can reflect real stress path of soil body are suggested.