【摘要】 针对纳子峡面板砂砾石坝实际情况,采用三维非线性动力有限元法,建立了大坝的三维有限元模型,计算了大坝在设计地震作用下的地震响应。根据面板坝土石料的三轴试验结果,选用坝料的残余应变模式,建立了同时计入残余体应变和残余剪应变的面板砂砾石坝地震永久变形计算模式,应用应变势概念及其相应的整体变形计算方法,计算预测了纳子峡面板坝的地震永久变形,分析了坝体地震永久变形的量值和分布规律。结果表明,大坝在7.5度地震作用下具有较好的抗震能力,其永久变形能够满足工程需要。更多还原

【Abstract】 According to the actual situation of Nazixia facing sand-gravel dam,and adopting the 3-D nonlinear dynamic finite element method,a 3-D finite element model is set up to calculate the seismic response of the dam under designed earthquake action.Based on the results of triaxial test,the dam material’s residual strain mode is chosen to set up the calculation model for the earthquake-induced permanent deformation of facing sand-gravel dams through considering both residual shear strain and residual volumetric strain.Then the earthquake permanent deformation of Nazixia facing sand-gravel dam is predicted,and the permanent deformation’s magnitude and distribution law of the dam is analyzed.The results show that the dam has a good aseismic capacity,which could meet the needs of the engineering’s permanent deformation.更多还原