Influence of Physical and Mechanical Properties of Overlying Filler on Shear Strength Characteristics of Composite Liner Interface
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.
万方数据
维普
