高堆石坝面膜防渗体非散粒体垫层工程特性试验——高面膜堆石坝关键技术（五）

针对传统土工膜垫层材料不能满足深覆盖层上高堆石坝面膜防渗体稳定性及适应变形要求的问题,采用室内渗透系数、抗压、抗弯折、直剪及结构模型试验等方法对一种新型多孔垫层材料——聚合物透水混凝土的透水性能、基本力学特性、界面抗剪强度及适应坝体变形能力等工程特性进行了一系列试验研究,并与传统无砂混凝土垫层材料的工程特性进行了对比试验与分析。试验结果表明,聚合物透水混凝土在具有较高强度和透水性的同时,还具有较低的弹性模量和显著的韧性特征,相对无砂混凝土具有更强的适应坝体变形能力,更适合用作深覆盖层上高堆石坝面膜防渗体垫层。

Experimental research on engineering property of non-granular cushion for high membrane faced rockfill dam:key technology of high membrane faced rockfill dam (V)

For the high rockfill dam built on the foundation of large overburden depth, the traditional cushion materials cannot maintain the stability of geomembrane surface barrier and satisfy the requirement of adaptability to dam deformation. Laboratory experiments such as: permeability test, compressive strength test, flexural property test, interface direct test, and structural model test were carried to evaluate the permeability, basic mechanical property, interface strength, and adaptability to deformation of new porous cushion material (polymer permeable concrete). Additionally, comparative tests and analysis of traditional cushion material-non-fine concrete-were also conducted. The test results show that polymer permeable concrete not only has high mechanical strength and water permeability, but also has lower elasticity modulus and obvious toughness. It is indicated that polymer permeable concrete has stronger adaptability to flexural deformation compared to non-fine concrete. It is concluded that the polymer permeable concrete is a better alternative to the traditional cushion material of geomembrane surface barrier for high rockfill dam built on thick foundation.