Numerical Simulation of the Large Deformation of Weak Broken Roadways Surrounding Rock under Dynamic Pressure

The formation of the constitutive equation uesd in this paper was based on geometric, physical nonlinear characteristic of rock, and strain softening of rock. Geometric characteristic of rock was analysed buy using polar decomposition theorem. Physical nonlinear characteristic of rock was analysed buy using incremental theory. The strain softening of rock was consider as coming from the damage of large deformation process. Non-linear finite element program based on the constitutive equation hereinbefore mentioned was formed. Fucun mine was chose as engineering background. The wall rocks of roadways are grouped to different engineering geology groups; and the rock mechanical parameters of wall rock are determined based on geological investigation of field engineering and indoor rock mechanical experiment. Numerical simulation of the large deformation of weak broken Fucun colliery roadways surrounding rock under dynamic pressure was finished using the non-linear finite element program. The simulation results and field test results were analyzed and compared. Numerical simulation results are in good agreement with the field test results.