Study on Deformation Early Warning Index of Concrete Gravity Dam

The traditional method of determining the dam safety monitoring index uses the hypothesis of small deformation and continuity of deformation, it can not band the stability against sliding of the gravity dam and the deformation of the dam together organically. Here the discontinuous deformation analysis (DDA) based on block theory is introduced into studying the relationship between stability of dam and its deformation. Considering the whole stability against sliding of the dam and its foundation, the whole stability against sliding of the 3# dam section of the Three Gorges left-bank workshop is analyzed in detail by use of the intensity reduced factor method, and the inner relation between the factor of safety and the displacement of dam is obtained. According to the destabilization criterion and the relation curve between the dam displacement and the intensity reduction coefficient, the dam structure behavior is determined, and the deformation early warning index of the dam under elastic condition and the load-bearing limiting condition are estimated.