破损拱坝的安全评价

Safety Evaluation of Sick Arch Dam

将矿产统计学中的克里格法应用到水工结构的安全评价上来,把材料的力学性能参数看作是空间随机场,根据样本点的实测值得到各个单元的力学性能参数。拱坝的应力状态不能反映其安全性,其安全性在于解除多余约束的难易程度上,因此若对破损拱坝进行安全评价必须进行破坏追踪,在破坏追踪的过程中,每当破坏一个单元,就把其力学参数看作一样本点,重新计算材料的随机场,以反映破坏过程中材料随机场对时间(破坏过程)的关系。

In this paper, the material parameters were looked as stochastic field, and the ordinary Kriging method that used in geostatistics was introduced to evaluate the safety of dam. The material parameters were regard as regionalized variables. Not only the random but also the structural of the parameter are taken into account. Every element's parameter can be obtained by use of the sample data. The stress status cannot reflect the safety of dam. The key to the safety of dam is the difficulty to relieve the highly indetermination. So cracking trajectories became necessary to evaluate the safety of arch dam. Once an element is crack, its material parameters were changed at the same time in the process of cracking tracing. This method is used to simulate the stochastic process of cracking.