糙面土工膜表面微凸体的法向变形规律  

Normal Deformation Law of the Asperities on the Surface of the Rough Geomembrane

作　　者：顾月 施建勇 GU Yue;SHI Jian-yong(Geotechnical Research Institute,Hohai University,Nanjing 210000,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210000,China)

机构地区：[1]河海大学岩土工程科学研究所,南京210000 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210000

出　　处：《科学技术与工程》2024年第7期2841-2846,共6页Science Technology and Engineering

基　　金：国家自然科学基金重点项目(41530637)。

摘　　要：土工膜在垃圾填埋场衬垫系统中具有重要作用,其中糙面土工膜(GMX)与无纺土工织物(GT)的界面强度较低且极易发生滑坡。糙面土工膜表面分布着高度不均且随机分布的微凸体,而微凸体的细观力学特性决定了GMX/GT的界面强度。本文利用改进的大型直剪仪对GMX/GT界面进行了单轴压缩试验,并用轮廓仪测量了压缩前后的土工膜表面轮廓高度。将GMX/GT的接触模型进行简化,研究了在法向载荷逐渐增加时的粗糙表面微凸体的法向变形规律。通过将理论结果和试验结果进行对比,明确了土工膜表面微凸体的变形过程,从细观角度揭示了糙面土工膜的法向变形机理。Geomembranes play an important role in the liner system of landfills,where the interfacial strength between rough geomembranes(GM)and nonwoven geotextiles(GT)is low and prone to landslides.There are highly uneven and randomly distributed asperities distributed on the surface of the rough geomembrane,and the mesomechanical properties of the asperity determine the interfacial strength of GMX/GT.A modified large direct shear apparatus was used to conduct uniaxial compression tests on the GMX/GT interface,and the contour height of the geomembrane surface before and after compression was measured using a profiler.By simplifying the contact model of GMX/GT,the normal deformation law of a rough surface asperity with gradually increasing normal load was studied.By comparing the theoretical and experimental results,the deformation process of the asperity on the surface of the geomembrane is clarified,and the normal deformation mechanism of the rough geomembrane is revealed from a microscopic perspective.

关 键 词：土工膜微凸体 压缩试验 法向变形 HERTZ接触理论 

分 类 号：TU502[建筑科学—建筑技术科学]