3D-FEM analysis of deep sliding stability of 3^# dam foundation of left power house of the Three Gorges Project

3DFEM computation model reflecting the real attitude and distribution of large structures and fault in the 3# dam foundation of the Three Gorges Project are created.The deep stability of dam foundation has been studied.A rational and practical method to judge the safety factor of dam foundation is proposed.The safety factor against sliding based on the concept of strength reserve of 3# dam foundation is given.