Dilatancy Model of Heterogeneous Rock with Confining Stress

To reflect the effect of confining stress on the dilatancy of rock, the relation between dilatancy angle and confining stress is presented through index of dilatancy. The heterogeneity of rock is modeled by Weibull distribution, and rock is supposed as the ideal elastic-plastic material. Then the dilatancy model of heterogeneous rock with confining stress is presented, and the code is developed in FLAC. In case study, the three sets of schemes in uniaxial plane strain compression and varied lateral restraint are studied, our main conclusions are as follows: (1) The effects of dilatancy angle on the bearing capacity of rock exist. Under the unvariable other conditions the strength of rock slightly increases with the increment of dilatancy angle.(2) With the increment of dilatancy angle the post-strength element of rock dilates much larger, and the area of the shear bands also increases. (3) The model presented in this paper can reflect the effect of confining stress on the dilatancy of rock, and the correspond conclusions accord with the experimental results.