【摘要】 发展能够合理评价面板堆石坝在施工期、蓄水期与地震期应力与变形的数值分析方法对于面板堆石坝的设计和安全运行具有重要的意义。本文开发了三维弹塑性有限元分析程序,根据紫坪铺筑坝堆石料单调和循环荷载大型三轴试验确定堆石料的广义塑性模型参数,对紫坪铺面板堆石坝的施工、蓄水过程及汶川地震震害进行了数值模拟,并与实际施工监测和震害调查结果进行了对比。结果表明:数值计算得到的大坝在施工期、地震期的变形,地震后面板应力分布及施工缝错台均与实测结果规律一致。表明采用考虑压力相关性的堆石料广义塑性模型进行面板堆石坝的施工期、蓄水期与地震期的全过程模拟是可行的。更多还原

【Abstract】 Numerical or analytical methods developed to properly evaluate the deformation of concrete faced rock-fill dam(CFRD),which is important to the dam safety during construction and operation process.In this paper,a three dimentional elasto-plastic finite element procedure is developed to simulate the construction process and seismic response during Wenchuan earthquake of the Zipingpu CFRD.The rock-fill materials are described through a modified generalized plasticity model.The parameters of generalized plastic model are calibrated by monotonic and cyclic triaxial experiments of rock-fill materials of Zipingpu CFRD.The step-by-step construction,impoundment and earthquake process during Wenchuan earthquake are simulated in numerical procedure.The numerical results agreed well with in-situ monitoring records of dam settlements,distribution of slab stress and dislocation of construction joints.It is concluded that construction,impoundment and earthquake process finite element analysis of high CFRD is feasible by using generalized plastic model considering pressure dependency.更多还原