ABSTRACT
Due to the presence of weak planes, a large number of high mountain slopes fail during strong earthquake. The failure mechanism of a slope under earthquake force is analyzed in this paper. The stress-strain curve at a point on the slope is presented in detail. Under the action of earthquake force, additional stress is generated in the slope. The additional stress is superimposed with the original stress to form the total stress. When the total stress exceeds the tensile strength of the rock mass, tensile failure occurs. The tensile failure process of the slope with double weak planes under strong earthquake is simulated by means of the finite element method. It is found that when the first main (tensile) stress is greater than or equal to the tensile strength of the rock, the rock mass will rupture. If the state of the total stress satisfies the plastic yield criterion, shear failure will occur; The tensile failure zone continuously expands during the process of seismic dynamic action. Under the seismic dynamic loading, the slope with double weak planes is easy to tension and rupture along the lower part of the weak plane. At the same time, the failure process of the slope was experimentally studied on a self-made dynamic experimental device. The experiment shows that the slope failure first occurs at the bottom of the weak plane layer, but the failure velocity of the upper part is faster. The numerical simulation results are in agreement with the experimental results.
