Nonlinear analysis of mine slope permanent displacement under seismic actions

The stability of mine slopes under earthquake has always been a hot topic, while the nonlinear strength of rock and soil have a more significant impact on slope safety.In this paper, the stability of mine slopes under different failure conditions are studied with the influence of tension cut-off.The plane strain logarithmic spiral rotation mechanism of limit analysis is selected to derive the work equation of yield acceleration under various combination of slope angle, frictional angle, overload coefficient, seismic load and tension cut-off factor.The classical Newmark method is used to derive and calculate the displacement of a typical mine slope in a mining project in Hezhou city.The results show that the tension cut-off has huge influence on yield acceleration of slope while the overload would cause greater reduction of the yield acceleration.On the other hand, the permanent displacement of mine slope considering tension cut-off would be two times of its counterpart without considering tension cut-off.As a result, the consideration of tension cut-off is critical to the seismic stability design of mine slope.