某铀尾矿库整治工程的三维地震动力响应研究  

Three-dimensional Seismic Dynamic Response of Renovation Project of a Uranium Tailings Pond

作　　者：郭大平 纪俊双 李玉雷 胡良才 李哲辉 张宁 GUO Daping;JI Junshuang;LI Yulei;HU Liangcai;LI Zhehui;ZHANG Ning(The Fourth Research and Design Engineering Corporation,CNNC,Shijiazhuang 050021,China;Hebei Water Conservancy Planning and Design Institute Co.,Ltd.,Shijiazhuang 050011,China)

机构地区：[1]中核第四研究设计工程有限公司,河北石家庄050021 [2]河北省水利规划设计研究院有限公司,河北石家庄050011

出　　处：《铀矿冶》2024年第4期94-105,共12页Uranium Mining and Metallurgy

摘　　要：铀尾矿库是重大危险源,在各种工况(包括极端灾害条件)下均应确保其安全可靠。地震工况是影响铀尾矿库安全的重要工况之一,采用三维动力有限元法对某铀尾矿库整治工程进行了地震模拟分析,选择考虑小应变刚度的硬化土模型和液化土模型作为本构模型,考虑罕遇地震的极端工况,将地震波特征参数和尾矿动力特性参数输入有限元地震动力模拟计算中,得到各工况尾矿库的位移云图、加速度云图、加速度时程曲线、潜在液化范围、增量位移云图等。结果表明,在地震作用下,坝体位移呈现累积增大的特征,整治工程实施后坝体位移明显降低;整治工程未对加速度反应造成明显改变;液化区主要分布在块石反压平台以下的堆积坝体,以浅层(深度约3~6 m)液化为主,对液化情况改善有限;整治工程实施后,罕遇地震工况下的最小安全系数由0.975提升至1.061,安全性得到了根本提升。Uranium tailings pond is a major safety and environmental hazard,and it is very important to ensure the safety and reliability under all conditions(including extreme disaster condition).Seismic condition is an important extraordinary working condition affecting the safety of uranium tailings ponds.Focused on the renovation project of a uranium tailings pond,the three-dimensional dynamic finite element method is applied to simulate and analyze seismic condition of uranium tailings pond for the first time.HS small model and UBC3D-PLM model constitutive model are selected to simulate and analyze a uranium tailings pond by dynamic finite element method.Seismic wave characteristic parameters and tailings dynamic characteristic parameters are taken into the finite element seismic dynamic simulation calculation,and the extreme conditions of rare earthquake are considered in the calculation,the displacement nephogram,acceleration nephogram,acceleration time history curve,potential liquefaction range and incremental displacement nephogram are obtained.The results show that the displacement of the dam body increases continuously under earthquake action,and the displacements of dam body decrease obviously after the implementation of the renovation project;there is no obvious change in the acceleration response caused by the renovation project;the liquefaction area is mainly distributed in the slope of the filled dam below the rock-filled platform,mainly in shallow layers(depth of about 3~6 m),and the improvement of liquefaction is limited.The stability safety factor of the dam body under rare earthquake increases from 0.975 to 1.061,the security of rare earthquake condition gets fundamental improvement.

关 键 词：铀尾矿库 整治工程 动力稳定 加速度响应 三维数值模拟 有限元分析 液化 

分 类 号：TL942[核科学技术—辐射防护及环境保护]