坝体结构稳定性计算分析

Calculation and Analysis of Dam Structure Stability

利用非线性静力有限元法,以锡伯图水库的枢纽工程碾压式沥青混凝土心墙砂砾石坝为例,对砂砾石过渡料、沥青混凝土的心墙、基础垫层料、坝壳和各接触面单元分别采用不同的计算模型进行大坝静力有限元分析,计算不同阶段坝体和心墙的位移及应力。结果表明坝体及坝基在水库竣工期和蓄满期位移变化不大,符合土石坝变形规律。心墙并未出现拉应力,但水压力小于竖向应力,其也没有出现水力拉裂或劈裂的现象。

Take the roller compacted asphalt concrete core sand-gravel dam of Xibotu Reservoir as an example.Using the nonlinear static finite element method,the dam static finite element analysis was carried out using different calculation models for the sand-gravel transition material,the core wall of asphalt concrete,the foundation cushion material,the dam shell and each contact surface element.And calculate the displacement and stress of the dam body and core wall at different stages.The results show that the displacement of the dam body and dam foundation does not change much during the completion period and the full storage period of the reservoir,which is in line with the deformation law of the earth-rock dam.There is no tensile stress in the core wall,but the water pressure is less than the vertical stress,and there is no hydraulic cracking or splitting phenomenon.