软弱岩体对西龙池上库1#副坝应力变形的影响分析

西龙池抽水蓄能电站上库1#副坝为沥青混凝土面板堆石坝,坝址地质地形复杂,有软弱岩层出露。本文采用E-B模型和Bursers粘弹性模型分别模拟堆石材料和沥青混凝土材料的应力应变关系,对该坝进行二维及三维应力变形有限元分析,计算结果较合理地揭示该坝在施工和蓄水过程中的受力和变形性状。本文对改善面板变形的两种软弱岩体开挖处理措施的效果作出了数值模拟和合理评价,为设计提供了参考。

Influence of weak rock on stress-deformation of auxiliary dam 1 # of Xilongchi upper reservoir

Stress-deformation analysis by using nonlinear FEM is performed on the auxiliary dam 1~# of the upper reservoir of Xilongchi pumped-storage hydroplant,a bitumen concrete faced rockfill dam.Duncan-Chang's E-B model and the Burgers model are used to describe the mechanical behaviors of the rockfill materials and the bitumen concrete face plate respectively.Two counter measures are proposed to solve the differential deformation of the bitumen concrete face plate due to the weak rock layer just below and evaluated by numerical simulation.The computed results illustrate the stress-deformation of the dam at stages of the final construction and full water storage.Some advices are provided to the project designs.