长江科学院院报2017，Vol.34Issue(2)：110-113,4.DOI:10.11988/ckyyb.20161056
高土石围堰复合土工膜防渗三维有限元分析
Three-dimensional Finite Element Analysis on Composite Geomembrane of High Earth Rockfill Cofferdam
摘要
Abstract
To reflect the mechanical properties of composite geomembrane in 3-D finite element calculation is a technical problem to be solved.On the basis of summarizing current numerical methods of geomembrane simulation, we propose to simulate the geomembrane using membrane element in 3-D finite element calculation.By building a finite element model of high earth-rock cofferdam of 65 m height with geomembranes contacted with dam in the up-stream and downstream,we simulated the flexible and rigid constraint conditions of geomembrane boundary respec-tively in filling construction and impounding stages.Results suggest that the membrane element could well reflect the flexible tensile properties of geomembrane.The proposed method could also adapt to the stepped filling in 3-D finite element simulation.Moreover,it could conveniently and effectively display the displacements and stresses of geomembranes in post-processing.The displacement distribution of geomembrane under flexible boundary restraint was the same with that under rigid boundary constraint;while the principal tensile stress and its distributed region under flexible boundary constraint were slightly smaller than those under rigid constraint.The calculation results are consistent with the general rules of earth-rockfill dam.关键词
复合土工膜/薄膜单元/三维有限元/高土石围堰/变形特性Key words
composite geomembrane/membrane element/3D finite element/high earth rockfill cofferdam/deform-ation characteristics分类
建筑与水利引用本文复制引用
徐晗,陈云,饶锡保,潘家军..高土石围堰复合土工膜防渗三维有限元分析[J].长江科学院院报,2017,34(2):110-113,4.基金项目
国家自然科学基金项目（51309029）；长江科学院创新团队项目（CKSF2015051／YT）；长江科学院院所基金项目 （）
