Behaviour of Geosynthetics Clay Liner Under Direct Shear Test

Abstract

Geosynthetics clay liner system is a key component of the engineered landfill. Both the internal and interface strengths of geosynthetics clay liner are very important for evaluating landfill stability. This paper presents a study on interface shear strength behaviour between geosynthetics clay liner and sand, and geosynthetics clay liner and Powai soil making use of a direct shear test. The experiments were carried out using dry state and submerged state of sand, and optimum moisture content and submerged condition of Powai soil. The interface shear strength of geosynthetics clay liner and sand, and geosynthetics clay liner and Powai soil found to be lower than the corresponding shear strength of sand and Powai soil. The apparent adhesion was increased, and interface friction angle was reduced during submerged condition.