基于位移反分析的小湾拱坝稳定性评价

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Abstract The effects of cracking of Xiaowan arch dam on the possibility of cracking propagation，and on the stress，displacement and stability should be considered seriously after phased realistic impounding. The basic principle is three-dimensional nonlinear numerical computation by simulation of the construction process of Xiaowan arch dam and the cracks in the dam based on reasonable material parameters which are obtained by the multipoint displacement back analysis on the basis of the monitoring data. The result indicates that the parameters obtained by the displacement back analysis are reasonable and accurate；and the prediction of the dam displacement is of high precision，which can provide a good stability estimation of the dam. The predicting results fit well with the monitoring data and the results of geomechanical model test. The global deformation of the dam accords with the general pattern；and the possibility of crack propagation is very small under the normal water load. The effects of cracking on the global stability of the dam are very small；and the limit state of the dam is similar to that of no cracking working condition. Both of them crack from the surface to the inside，instead of cracking from the internal cracking.

Key words： hydraulic engineering Xiaowan arch dam crack displacement back analysis stability

Received: 21 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I11/2242

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