True Triaxial Undrained Shear Tests of a Coarse Sand

A series of true triaxial compression tests of Fujian Standard Sand under different cell pressures and intermediate principal stress coefficients are performed on a true triaxial testing apparatus.The stress-strain characteristics of the coarse sand under the undrained conditions are obtained.The effect of the intermediate principal stress coefficient on the deviatoric stress,pore water pressure,stress ratio,and effective principal stress ratio with the coefficient of variation of principal stress is also discussed in this paper.