摘要
填埋是我国生活垃圾的主要处置方式。复合衬垫系统作为污染物与外部环境之间的屏障,是现代生活垃圾填埋场的重要组成部分。复合衬垫界面的动力剪切强度较低,在地震作用下填埋场极易沿衬垫界面发生滑移,并进一步造成填埋场整体结构的失稳破坏。针对国内外现有填埋场中常见的糙面HDPE土工膜-压实黏土复合衬垫界面,利用大型界面动力直剪仪,开展了考虑剪切位移振幅因素影响的动力剪切试验,得到了糙面土工膜-压实黏土衬垫界面的应力-位移曲线及动剪切强度演化过程,并进一步分析了动剪切模量和动阻尼比的振幅相关性。通过与已有涉及其他类型衬垫界面的对比,分析了糙面土工膜-压实黏土作为填埋场复合衬垫的抗震有利因素。
Landfill is the main disposal method of municipal solid waste in China.Liner system is a vital part for modern municipal solid waste(MSW)landfills due to its essential function as a barrier between pollutants and environment.However,due to the relatively lower shear strength between landfill liners,the composite liner interface may become the potential slip interface under earthquake loading,which will lead to instability of the landfill.In this paper,a series of dynamic shear tests considering the effect of shear displacement amplitude were carried out by using a large interface direct shear apparatus,the shear stress-displacement relations and dynamic shear strength evolution process of textured HDPE geomembrane-compacted clay composite liner interface were obtained.The amplitude correlation between dynamic shear modulus and dynamic damping ratio were further analyzed.The comparisons between existing data on other composite liner materials validate the efficiency of textured geomembrane-compacted clay when the landfill exposed to dynamic loading.
作者
冯世进
史嘉梁
郑奇腾
FENG Shijin;SHI Jialiang;ZHENG Qiteng(Key Laboratiry of Geotechnical and Underground Engineering,Ministry of Education,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)
出处
《结构工程师》
2024年第3期125-134,共10页
Structural Engineers
基金
国家自然科学基金重点项目(41931289)
国家自然科学基金杰出青年基金项目(41725012)
国家重点研发计划项目(15ZZ081)。
