Abstract
Being nearly impervious, geosynthetic clay liner (GCL) can be used as an alternative of conventional compacted clay liner in many cases. According to the requirement of waterproof protection of Yungang Grotto, the authors conducted permeability test and shear test on GCL. A simple method was proposed to investigate the seepage coefficient of GCL, which can also be used to estimate the permeability of the composite comprising GCL and the surrounding soil. Shear test was made with a slab, friction angle of the interface between GCL and soil was measured.