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Abstract Taking the deformed rock mass of Longpan slope along Jinsha River for example，the dynamic response and failure mechanism of slope rock mass under seismic loading are simulated by distinct element method. The time-history curve of artificially synthetic acceleration is used，and the effect of excess static pore water pressure is taken into account. The following results are obtained. The seismic inertia force results in accumulation of shear stress. The discontinuous structures are crucial to wave transmission. The ultimate dynamic response of slope system takes place at the initial period of seismic loading. Essentially the main mechanism of deformation and failure of rock mass induced by earthquake is the coupling effect of shear stress and excess static pore water pressure accumulation. At the same time，the results show that the deformed rock mass of Longpan slope is unlikely to form a long-distance landslide. This conclusion has important application value for the choice of dale dam site along Jinsha River.
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Received: 03 July 2008
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