深厚覆盖层上复合土工膜防渗堆石坝筑坝特性研究

在扼要分析防渗土工膜主要力学特性的基础上，结合一在建的深厚覆盖层上复合土工膜防渗堆石坝，对其进行非线性结构分析，着重研究复合土工膜和防渗墙的受力变形特性，并对几种不同规格的复合土工膜进行选型分析，确定适合大坝选用的防渗复合土工膜。此外，对坝体和坝基材料参数变化对复合土工膜和防渗墙受力变形的影响进行了敏感性分析。研究表明，在现有可能不利条件下该坝复合土工膜和防渗墙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。

Study of construction behavior of composite geomembrane rockfill dam on thick alluvium deposit

Based on the brief discussion of main mechanical properties of geomembrane, the nonlinear finite element method is applied to calculate the deformation and stress of a composite geomembrane rockfill dam on thick alluvium deposit which is under construction, with emphasis on the mechanical behaviors of composite geomembrane and anti-seepage concrete wall. According to the calculation results, several types of composite geomembrane are discussed and the appropriate one is chosen for the dam. Furthermore, the sensitivity analysis of the earth-rockfill material parameters on the mechanical characters of composite geomembrane and concrete wall is done. The analysis results show they can meet the need of the dam’s normal operation.