摘要
在土石坝坝体防渗中,土工膜有时作为一种防渗材料铺设在坝体的上游坡中,以保护坝体的安全运行。在试验基础之上,重点分析复合土工膜的主要力学特性,并结合一座建在深厚覆盖层上的复合土工膜防渗土石坝,对其进行非线性结构分析,着重研究复合土工膜与坝体结构面之间的剪切变形特性。试验结果表明,复合土工膜与坝体粗粒料垫层结构面的剪应力-剪应变关系为应变软化型。计算结果表明,在现有可能不利条件下,该坝坝体、坝基及复合土工膜的应力变形均在合理可控范围之内,大坝结构安全能够满足要求。
In seepage prevention of dams,geomembranes are commonly used to prevent seepage on the front side of a dam in order to protect the safety of the dam.Based on experimental tests,main mechanical properties of composite geomembrane are analyzed,the nonlinear finite element method is used to calculate the deformation and stress of a composite geomembrane rockfill dam,Shear deformation characteristic between composite geomembrane and the structure plane of dam body is studied.The experimental results show that constitutive mode of composite geomembrane and coarse-grained materials cushion layer interface is strain-softening and that deformation and stress behaviors of dam body,dam foundation and composite geomembrane are in the normal state under unfavorable conditions.
出处
《中国农村水利水电》
北大核心
2011年第5期101-104,共4页
China Rural Water and Hydropower
基金
国家高等学校博士点专项科研基金资助课题(200807580007)
新疆水利水电工程重点学科基金资助项目(xjzdxk-2002-10-05)
关键词
土石坝
复合土工膜
摩擦试验
剪切特性
接触面
earth-rock dam
composite geomembrane
test of friction
characteristic of shear
contact face
