A STRAIN HARDENING MODEL REFLECTING STRESS PATH CORRELATION OF CORASE-GRAINED MATERIALS
Coarse-grained materials have become main filling materials of high fill engineering in mountainous areas,and building a constitutive model,which can well reflect its stress-strain behavior,is significant for the simulation analysis and safety evaluation of high fill engineering.On the basis of analyzing large scale triaxial experimental results,a new elastic-plastic model is proposed by combining the hardening soil model and the modified cam-clay model,in which the logarithmic relation of strength parameters of coarse-grained materials is also adopted.The new model can not only reflect the nonlinear deformation behavior,nonlinear strength property,confining stress dependence of stiffness,and dilatancy of coarse-grained materials,but also is capable of considering the stress path correlation and simulating the deformation of coarse-grained materials under complex stress paths.Besides,the model parameters can be defined by conventional triaxial experiments.Finally,the model is validated by comparing with different stress path experimental results on coarse-grained materials.