The objective of this study was to evaluate shear behavior and failure mechanisms of composite systems comprised of a geosynthetic clay liner (GCL) and textured geomembrane (GMX). Internal and interface direct shear tests were performed at normal stresses ranging from 100 kPa to 2000 kPa on eight different GCL/GMX composite systems. These composite systems were selected to assess the effects of (i) GCL peel strength, (ii) geotextile type, (iii) geotextile mass per area, and (iv) GMX spike density. Three failure modes were observed for the composite systems: complete interface failure, partial interface/internal failure, and complete internal failure. Increasing normal stress transitioned the failure mode from complete interface to partial interface/internal to complete internal failure. The peak critical shear strength of GCL/GMX composite systems increased with an increase in GMX spike density. However, the effect of geotextile type and mass per area more profoundly influenced peak critical shear strength at normal stress > 500 kPa, whereby an increase in geotextile mass per area enhanced interlocking between a non-woven geotextile and GMX. Peel strength of a GCL only influenced the GCL/GMX critical shear strength when the failure mode was complete internal failure.

这项研究的目的是评估由土工合成粘土衬里（GCL）和纹理土工膜（GMX）组成的复合系统的剪切行为和破坏机理。在八种不同的GCL / GMX复合系统上，在100 kPa至2000 kPa的正应力下进行了内部和界面直接剪切测试。选择这些复合材料系统来评估（i）GCL剥离强度，（ii）土工布类型，（iii）单位面积的土工布质量和（iv）GMX钉密度的影响。对于复合系统，观察到三种故障模式：完全接口故障，部分接口/内部故障和完全内部故障。法向应力的增加将故障模式从完整的接口转换为部分接口/内部，以完成内部故障。GCL / GMX复合系统的峰值临界剪切强度随GMX峰值密度的增加而增加。但是，土工布类型和单位面积质量的影响更深地影响了法向应力> 500 kPa时的峰值临界抗剪强度，因此，每单位面积土工织物质量的增加增强了非织造土工织物与GMX之间的互锁。当破坏模式为完全内部破坏时，GCL的剥离强度只会影响GCL / GMX的临界剪切强度。