DISCUSSION ON APPLICABILITY OF BINARY-MEDIA MODEL TO REMOLDED LOESS

The main objective of the present study is to verify the applicability of binary-media model to remolded loess. To this end,triaxial compression tests are carried out. The stress-strain relationships and failure modes of specimen are obtained. The effects of confining pressure on the deformation behavior of specimen are analyzed. Moreover,we compare the characteristics of deformation behavior of remolded loess and the basic assumptions of binary-media model. The binary-media model is supposed to be a suitable approach to describe the mechanic behavior of remolded loess. Therefore,we proposed a parameter determination rule based on the characteristics of each parameter. The validity is further verified through the comparison between the fitting curves and the testing data. The suggest order of parameter determination is 'the elastic modulus of the bonded element → the breakage ratio → the parameters of frictional element → local strain coefficient'. The results indicate that double bear state is found in remolded loess sample and the stress-strain relationships of sample can be precisely described by the binary-media model. The higher the confining pressure,the faster the structural damage. Moreover,the frictional element shares most of the axial load in the late period of loading regarding the softening curve. With the transition of the stress-strain curve to the hardening type,load shared by the friction element decreases gradually at the late period of loading.