Influence of Physical and Mechanical Properties of Overlying Filler on Shear Strength Characteristics of Composite Liner Interface
YANG Guihua1, WANG Xiangchun2, HE Jianqing2, CHEN Qiunan2, LI Junwei3
1.Geological Survey Institute of Hunan Province, Changsha 410014, Hunan, China;
2.Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan 411100, Hunan, China;
3.Natural Resources Survey Institute of Hunan Province, Changsha 410014, Hunan, China
Abstract：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.
杨贵花, 王湘春, 贺建清, 陈秋南, 李军伟. 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[J]. 矿冶工程, 2024, 44(1): 16-20.
YANG Guihua, WANG Xiangchun, HE Jianqing, CHEN Qiunan, LI Junwei. Influence of Physical and Mechanical Properties of Overlying Filler on Shear Strength Characteristics of Composite Liner Interface. Mining and Metallurgical Engineering, 2024, 44(1): 16-20.
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2024, Vol. 44 
