Abstract
In a three-dimensional analysis of slope stability in discontinuous rock, it is very important to identify discontinuities which should be evaluated. Also the seismic force and water pressure which act to the rock-blocks affect to their stability. In this paper, a simplified method for extraction of the unstable wedge is proposed by formulating the wedge type failure condition of the rock slope, considering the water pressure and seismic force. The failure condition is formulated without the shape and scale of rock-blocks. Therefore, the proposed method is useful to evaluate the stability of surface wedges in rock slope with complex form.
