Analysis on Progressive Failure Characteristics of Slope Flexural Toppling Based on Discrete Element Method
A set of dominant steeply inclined discontinuities generally exists in flexural toppling slopes.The rock mass bends and deforms to the free surface under self-weight or external forces,showing obvious flexible features.Based on a physical model test,a cor-responding discrete element model was established to simulate the progressive failure of slope flexural toppling.Meanwhile,the mechani-cal mechanism and failure characteristics of rock flexural toppling were systematically analyzed.The results show that the plastic zone penetration is a necessary and non-sufficient condition for the failure of such slopes,and the internal stress of the cantilevered rock shows inhomogeneity in the bending process.Further,the influence law of key mechanical parameters on the fracture surface was explored.It is concluded that the dip angle of the fracture surface increases with the increase of joint friction angles,while the influence of joint cohesion and rock tensile strength is not significant.The research can provide scientific reference for the analysis and design of toppling slopes.
flexural topplingrock slopediscrete element methodfailure mechanism
万方数据
维普
