Dynamic analysis of side slope stability against deep sliding

Mechanical characteristics of rock joints and interfaces under cyclic loading are important to stability safety of upper structure.For an example,three kinds of models are compared in dynamic stability analysis against sliding.Finite element method is used and rock structural surfaces are simulated with contact elements.The sliding security is evaluated by displacements,yield region of contact surface and point safety coefficient.Elasticperfect plastic model underestimate the deformation capability of contact surface,relative displacement obtained is less than real value,yield region is on the high side,and safety coefficient is on the low side.In simplified nonlinear model,contact stiffness decreases when shear relative displacement increases,deformation capability and safety coefficient are overestimated.In complex nonlinear model,the characters of peak friction and dilation wear under cyclic load of natural rock joints are considered,and the numerical analysis result lies between last two models.