上覆层填料物理力学特性对复合衬垫界面剪切特性影响研究  

Influence of Physical and Mechanical Properties of Overlying Filler on Shear Strength Characteristics of Composite Liner Interface

作　　者：杨贵花 王湘春 贺建清[2] 陈秋南[2] 李军伟 YANG Guihua;WANG Xiangchun;HE Jianqing;CHEN Qiunan;LI Junwei(Geological Survey Institute of Hunan Province,Changsha 410014,Hunan,China;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411100,Hunan,China;Natural Resources Survey Institute of Hunan Province,Changsha 410014,Hunan,China)

机构地区：[1]湖南省地质调查所,湖南长沙410014 [2]湖南科技大学岩土工程稳定控制与健康监测省重点实验室,湖南湘潭411100 [3]湖南省自然资源调查所,湖南长沙410014

出　　处：《矿冶工程》2024年第1期16-20,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(52078211);湖南省自然科学基金(2017JJ30252);湖南省自然资源厅基金(20230143DZ)。

摘　　要：采用改进ZLB-1型三联流变直剪仪研究了填料特性对复合衬垫界面剪切特性的影响,得到上覆层填料不同物理力学特性在不同法向应力下的剪切应力-位移曲线。结果表明,黏土与砂土均出现了位移软化现象,且随含砂率增加,位移软化现象更明显;土工膜-钠基膨润土垫界面在复合衬垫界面中摩擦系数最低,且饱和状态下界面摩擦系数明显低于非饱和状态下界面摩擦系数。含砂率增加,复合衬垫界面间似黏聚力降低,似摩擦角先降低后增加再降低;含水率增加,似黏聚力和似摩擦角均先增大后减小。The influences of physical and mechanical properties of overlying filler on the shear strength characteristics of composite liner interface were studied by adopting a modified ZLB-1 triple rheological direct shear apparatus,and shear stress-strain curves of overlying filler under different normal stresses were obtained.The experimental results show that both clay and sand present displacement softening behavior,which becomes more obvious with the increase of sand content.Among the interface of composite liners,the interface between geomembrane and sodium bentonite pad has the lowest friction coefficient,and the friction coefficient in saturated state is significantly lower than that in the unsaturated state.As the sand content increases,the pseudo-cohesion between the interface of composite liner decreases,while the pseudo-friction angle initially decreases,and then increases followed by another decrease.As the water content increases,both the pseudo-cohesion and pseudo-friction angle decrease after an initial increase.

关 键 词：上覆层 填料 直剪仪 衬垫材料 防渗材料 界面摩擦系数 

分 类 号：TU592[建筑科学—建筑技术科学]