摘要
某水库大坝为土工膜防渗石渣坝,坝面利用复合土工膜作为面板进行防渗。对该水库大坝建立三维非线性有限元模型,模拟大坝填筑施工、复合土工膜铺设及水库蓄水过程,分析了竣工期和蓄水期下坝体和复合土工膜的应力变形情况,论证了该土工膜防渗石渣坝结构设计的合理性。计算结果表明,蓄水前后坝体的位移和应力分布符合一般规律,且蓄水对坝体安全有利,坝体不会出现剪切破坏;复合土工膜在坝面下半部分由于受边界约束出现拉应变,产生拉应力,但计算得到的横向和纵向安全系数均满足规范要求,土工膜安全可以得到保证。
For a certain reservoir dam that is a geomembrane face rockfill dam,the composite geomembrane is used as the face slab on the dam surface to prevent seepage.A three-dimensional nonlinear finite-element model of this reservoir dam was built to simulate the dam filling construction,the laying of the composite geomembrane,and the process of reservoir impoundment.The stress and deformation of the dam body and the composite geomembrane during the completion and impoundment periods were analyzed,and the rationality of the structural design of this geomembrane face rockfill dam was demonstrated.The calculation results show that the distribution of the dam body displacement and stress before and after impoundment follows the general rules and that impoundment is beneficial to the safety of the dam.Moreover,the shear failure of the dam body is prevented.The composite geomembrane is subject to tensile strain and stress in the lower half of the face slab due to boundary constraints.Nevertheless,the lateral and longitudinal safety factors calculated meet the requirements of design specifications,and the safety of the geomembrane is guaranteed.
作者
赵昱豪
李振华
陈司宁
龚汉忠
林威
ZHAO Yuhao;LI Zhenhua;CHEN Sining;GONG Hanzhong;LIN Wei(College of Water Conservancy&Hydropower Engineering,Hohai University,Nanjing 210098,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China)
出处
《人民珠江》
2022年第8期83-87,共5页
Pearl River
基金
江苏省研究生实践创新计划基金(SJCX21_0199)。
关键词
石渣坝
复合土工膜
应力变形
有限元法
rockfill dam
composite geomembrane
stress and deformation
FEM