A Constitutive Model of Rock and Its Application in Numerical Simulation of Underground Explosion

摘要

In this paper a useful and special constitutive model of rock material suitable for the numerical study of stress waves induced by underground explosion is discussed and developed. The influences of microdefect (microcrack and micropore) on the nonlinear behavior of rock are described by reduction coefficient and porosity evolution. Strain hardening and damage softening are taken into account by different yield surface at different deformation stage. Finally, numerical simulations are carried out for a typical underground nuclear explosion and the results are compared to those measured in the field or published in other papers. The achievement of the numerical simulation shows that the model developed in the paper is reasonable and effective.