重力坝最大可能破坏模式的探讨

An approach to the most possible fallure mode of gravity dams

本文将重力坝的上下游水位、坝体坝基强度等作为随机变量,首次用随机有限元法探讨了重力坝在自重和水压等荷载作用下的最大可能破坏模式;编制了相应的FMAP程序,用系统可靠度理论汁算了整个重力坝的失效概率及可靠度.最后,提出了极限状态设计概念,即以系统破坏程度建立相应的目标可靠指标来设计重力坝.

The most possible failure mode of gravity dams subjected to water pressure and self-weight of the dam is studied by the plane random finite element method. The strength limit state and the sliding limit state are considered. The upstream and downstream water levels of the dam, the elastic modulus and unit weight of the dam and its foundation, the tensile and compressive strength of the material, the friction factor and the cohesion between the dam and the foundation are considered as the random variables. A special program for the method is compiled and used to calculate a gravity dam. The results obtained indicate that the method is available for finding the most possible failure mode and failure probability of a dam.