The modified model can reflect the effect of medium principal stress change on the medium principal stress parameter,and it is compared with the true triaxial test taking the medium principal stress parameter as constant.

The coefficient of intermediate principal stress and orientation of principal stress are varied so that their influences on shear b.

A series of tests are conducted for loose sand under complex stress conditions with different coefficient of intermediate principal stress,orientation of principal stress and mean principal stress.

It is found that the coefficient of intermediate principal stress is smaller than 0 at plane-stress condition,which maybe one of the possible reasons leading to the numeric analysis result inconsistent with the testing result when the generalized Mises criterion used.

Determination of stressing parameters of environmental stress screening(ESS)and its consideration;

The elastoplastic analysis of the bending of the thickness-varying ring plate made of ideal material has been carried out in terms of the introducing parameter stress field, and its relevant elastoplastic stress field and the demarcation line between elasticity and plasticity are given.

Evaluation of effect of intermediate principal stress on sand shear strength;

The influence of intermediate principal stress on studying the characteristic of soil;

Influence of intermediate principal stress on deformation and strength of gravel;

Experimental study on effect of initial intermediate principal stress coefficient on dynamic shear modulus and damping ratio of medium-dense fly ash;