局部软弱岩体对重力坝变形及应力分布的影响  

Effect of Local Weak Rock Mass on the Deformation and Stress Distribution of Gravity Dam

作　　者：徐本锋 李贵斌 张萌 杨子越 陈亮帆 XU Benfeng;LI Guibin;ZHANG Meng;YANG Ziyue;CHEN Liangfan(Baoshan Energy Development Co.,Ltd.,Baoshan 678000,China;School of Water Resources and Hydropower,Hohai University,Nanjing 210098,China)

机构地区：[1]保山能源发展股份有限公司,云南保山678000 [2]河海大学水利水电学院,江苏南京210098

出　　处：《河南水利与南水北调》2024年第10期69-71,共3页Henan Water Resources & South-to-North Water Diversion

摘　　要：文章探讨了局部软弱岩体对重力坝变形及应力分布的影响。结合某重力坝工程,建立了包含坝体、基岩、不良岩体、断层和节理等断裂构造的三维有限元模型,并使用ABAQUS有限元软件分析了自重和水荷载等主要荷载作用下的坝体变形和应力分布。结果表明,局部软弱岩体对重力坝变形和应力分布有显著影响,尤其是不良岩体对坝体沉降和水平位移的影响较大。在完建工况下,不良岩体对地基不均匀沉降及坝体变形影响最大,典型坝段坝踵沉降量变化不到2mm,变化量为7.84%,引起的顺河向位移变化量为12.78%,横河向位移变化量为44.87%。不良岩体对各剖面处的压应力影响最大,特别是在1-1和2-2剖面处,坝底压应力增幅分别达到1.96倍和6.21%。相比之下,断层F11和节理FC09、FC12对变形和应力分布的影响较小。文章为类似工程提供了重要的理论依据和实际指导。This paper discusses the influence of local weak rock mass on the deformation and stress distribution of gravity dam.Combined with a gravity dam project,a three-dimensional finite element model including dam body,bedrock,weak rock mass,fault and joint structure was established,and the deformation and stress distribution under the main load such as dead weight and water load are analyzed using ABAQUS finite element software.The results show that the locally weak rock mass has a significant influence on the deformation and stress distribution of the gravity dam,especially on the settlement and horizontal displacement of the dam mass.Under the finished construction condition,the weak rock mass has the greatest impact on uneven settlement and dam deformation,the settlement of the typical dam heel is less than 2mm,7.84%,the displacement along the river is 12.78%,and the horizontal displacement is 44.87%.The weak rock mass has the greatest influence on the compressive stress at each section,especially at the 1-1 and 2-2 sections,where the increase of the compressive stress at the dam bottom reaches 1.96 times and 6.21%,respectively.In contrast,fault F11 and joints FC09 and FC12 had less effect on the deformation and stress distribution.The research provides important theoretical basis and practical guidance for similar projects.

关 键 词：重力坝 不良岩体 断层 节理 变形 应力 敏感性分析 

分 类 号：TV314[水利工程—水工结构工程]