衬垫变形对其渗透性能的影响  

Influence of liner deformation on permeability

作　　者：许四法[1] 叶科 汪俊 吕健威 王哲[1] XU Sifa;YE Ke;WANG Jun;LYU Jianwei;WANG Zhe(Institute of Geotechnical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学岩土工程研究所,浙江杭州310023

出　　处：《浙江工业大学学报》2025年第2期119-124,共6页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(52078467)。

摘　　要：压实黏土具有较好的防渗性能,常被用作卫生垃圾填埋场的衬垫材料,然而其抗裂性能较差,且在衬垫变形开裂后其防渗性能也进一步降低。笔者设计了一款模拟衬垫变形和渗透的试验装置,研究衬垫变形条件下其渗透性能的变化规律,并采用粒子图像测速技术计算分析衬垫表面土体的位移规律。试验结果表明:当变形量为1,2,3 cm时,衬垫产生裂隙,裂隙宽度分别为1,7,15 mm,衬垫破坏水头分别为4.6,4.2,3.6 m;衬垫变形时衬垫厚度对渗透性能有较大影响,当变形量为3 cm时,厚度20 cm的衬垫被裂隙贯穿,厚度30,40 cm的衬垫上部无裂隙区域厚度分别为8,20 cm。Compacted clay has good anti-seepage performance and is often used as a liner material for sanitary landfill sites.However,its crack resistance is poor and its anti-seepage performance is further reduced after the liner is deformed and cracked.In this paper,a test device is designed to simulate the deformation and permeability of the liner.The permeability variation of the liner system under deformation conditions is studied and the displacement of soil on the surface of the liner is calculated and analyzed by particle image velocimetry.The test results show that when the deformation is 1,2 and 3 cm,cracks occur in the lining with widths of 1,7 and 15 mm and the failure water head of the lining is 4.6,4.2 and 3.6 m,respectively.The thickness of the liner has a great influence on the permeability when the pad system is deformed.When the deformation is 3 cm,the liner with a thickness of 20 cm is penetrated by cracks and the thickness of the upper non-cracking area of the liner with thicknesses of 30 and 40 cm is 8 and 20 cm,respectively.

关 键 词：膨润土掺砂混合土 渗透性能 衬垫变形 裂隙 

分 类 号：TU398.9[建筑科学—结构工程]