横观各向同性岩基对重力坝地震响应的影响  

Influence of Transverse Isotropic Layered-rock Foundation on Seismic Response of Gravity Dam

作　　者：燕柳斌[1] 陈志[1] 苏国韶[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《水力发电》2010年第8期25-27,58,共4页Water Power

基　　金：广西自然科学基金(0832023);广西研究生教育创新项目(105930903073)

摘　　要：采用基于有限单元法的振型分解反应谱法,研究横观各向同性的层状岩基对重力坝地震响应的影响。研究结果表明,层状岩基的横观各向同性对地震荷载下重力坝的坝踵应力影响不容忽视;层状岩基平行层面与垂直层面方向弹性模量的差异对重力坝的坝体自振频率、坝顶位移及坝踵应力影响显著;岩层倾角对坝体自振频率影响不大,但对坝顶位移及坝踵应力影响较大,倾角60°～135°对坝踵应力分布较为不利。The seismic response of gravity dam founded on the transverse isotropic layered-rock was studied by using finite element method based on modal response spectrum method.The results show that the transverse isotropic of layered-rock foundation is a major factor on heel stress of gravity dam,the difference on elastic modulus of bedding parallel and vertical direction has significant influence on dam body natural frequency,crest displacement and heel stress,and the inclination of layered-rock has little effect on natural frequency of dam body,but great effect on crest displacement,and negative heel stress distribution when the inclination is between 60 to 135 degree.

关 键 词：横观各向同性 岩基 重力坝 地震响应 Gravity Dam Seismic Response 应力影响 自振频率 振型分解反应谱法 坝踵 层状 有限单元法 应力分布 岩层倾角 位移 频率影响 量的差异 地震荷载 坝体 坝顶 

分 类 号：TV73[水利工程—水利水电工程] TM612[电气工程—电力系统及自动化]