复合土工膜库盆防渗上水库应力变形性态分析  

Deformation and Stress Behavior Analysis of Upper Reservoir with Composite Geo-membrane as Impermeable Material

作　　者：周奕琦[1] 沈振中[1] 王伟[2] 马秀伟[2] 彭迪 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,南京210098 [2]中国水电顾问集团西北勘测设计研究院,西安710065 [3]扬州市城市防洪工程管理处,江苏扬州225000

出　　处：《南水北调与水利科技》2014年第2期160-163,174,共5页South-to-North Water Transfers and Water Science & Technology

基　　金：河海大学水文水资源与水利工程科学国家重点实验室专项基金(2009586012)

摘　　要：抽水蓄能电站上水库坝体和库盆的变形会影响其防渗结构和效果。某抽水蓄能电站上水库大坝为混凝土面板堆石坝,库底平台利用复合土工膜防渗。针对该坝体和库盆,建立三维非线性有限元模型,模拟坝体和库底回填料的施工填筑过程及水库蓄水过程,分析了蓄水期坝体、库底回填料和土工膜的变形应力情况,论证了该库结构设计的合理性。计算结果表明,蓄水期坝体的位移分布规律性较好,应力分布合理;土工膜的安全系数满足规范要求,选型合理;土工膜能较好地适应回填料的变形,不会出现脱空现象;在库盆中回填料与基岩的分界区,土工膜的法向位移等值线梯度较大,拉应力也较大,需要重点关注。The deformation of dams and reservoir basin of upper reservoir at the pumped storage power station can affect the an-ti-seepage structure and effects .The dam of upper reservoir at a pumped storage power station is a concrete faced rockfill dam and the impermeable material of reservoir bottom is composite geo-membrane .Aiming at the dam and the reservoir basin ,the 3-D non-linear finite element model was developed to simulate the filling process of the dam and backfill and the storage process of the reservoir .The deformation and stress of the dam ,backfill ,and composite geo-membrane were analyzed ,and the rationality of the structural design was demonstrated .The results showed that the displacement distribution and stress distribution of the dam were reasonable .The option on composite geo-membrane was reasonable as the safety factors met standard requirements .The composite geo-membrane can adapt to the deformation of the backfill very well without the occurrence of disengaging phenome-non .Emphasis should be put in the dividing area of backfill and bedrock as the gradient of the normal displacement equipotential line of composite geo-membrane was large and tensile stress was high .

关 键 词：抽水蓄能电站 上水库 面板堆石坝 复合土工膜 应力变形 非线性有限元法 

分 类 号：TV314[水利工程—水工结构工程]