Study On The Wedge Stability Against Deep Siliding Of Gravity Dams

It is a key problem of stability against deep siliding in gravity dam designing.The stability against deep sliding of Nongling hydroelectric power station are calculated and analyzed by the theory of reliability, the method recommended in the Design Specification and Finite element method, on the basis of the introduction on traditional rigid equilibrium limit method. Several aspects listed below are researched:The three methods of stability against deep siliding for double-inclined wedge are discussed, and the formulas of equal safety factor and angle of splitting as the smallest resistance are deduced. The safety coefficients obtained by the different approaches are compared through an engineering example.The reliability calculating formulas and procedure for stability against deep siliding are deduced based on the theory of reliability. And the conclusions of the stability against deep sliding of 7th overflow dam of Nongling hydroelectric power station applied by the procedure are almost as same as applied by traditional rigid equilibrium limit method.Up to now there are no criterions about Finite element method applied to safety coefficient, the stability against deep sliding of 7th overflow dam of Nongling hydroelectric power station is analysed by ANSYS program and the judge rule about Finite element method applied to gravity dam stability against deep sliding is discussed in this thesis. A conclusion that the dam is safe and won't slide along deep interlayer can be drawn based on the comprehensive consideration including safety coefficient and stress distributing.The paper discusses the limitations involved in the wedge stability analysis method specified in the Design Specification. And the reasonable expression of analysis recommended in this paper is not only clear but also the result is apt to safety through a practical engineering example, supplying references and discussion forengineering design.