Prediction of coupled HM effects on the Shuibuya CFR dam safety due to cracks in concrete face slabs
The concrete faced rockfill (CFR) dam of the Shuibuya Hydropower Project, with the maximum height of 233 m, is up to now the highest CFR dam built in the world. During construction and after completion of the project, however, a group of cracks were discovered on the concrete face slabs, which is the major measure for seepage control of the dam. Though measurements have shown that the cracks would not endanger the safety of the dam, sensitivity analysis is still needed to predict the seepage behavior of the dam in partial or complete deficiency of the face slabs on a coupled hydro-mechanical (HM) basis. In this study, a coupled saturated flow and stress process was considered to investigate the effects of the concrete face slab deficiency on the seepage behavior and safety of the dam. The deformation response of the rockfills is described by using the Duncan-Chang nonlinear elastic E-B model, together with the Desai’s thin layer elements for the interface between the face slabs and the buffer material. The coupling effect of stress on hydraulic conductivity of the rockfill is described by the Gangi’s model, which is embedded in the code for saturated flow process formulated with an adaptive variational inequality for eliminating the singularity at the outlet seepage points and resultant mesh dependency. Sensitivity analysis was performed to predict the coupled HM behavior of the CFR dam and the numerical results agree well with the field measurements.
Yifeng Chen Xinying Mao Chuangbing Zhou
State Key Laboratory of Water Resources and Hydropower Engineering, Wuhan University, Wuhan
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）