GEOSYNTHETIC REINFORCEMENT-COHESIVE SOIL INTERFACE DURING PULLOUT

摘要

The influence of soil's physicochemical property (cohesion) on the pullout behavior of different geosynthetic reinforcements was studied in this paper. This was accomplished by considering the pullout load-displacement curves measured at different points along the reinforcement. One woven geotextile and four geogrids with different stiffnesses and geometries were studied. The measured load-displacement and the deduced load-deformation curves were examined to determine the interface strength parameters (interface adhesion and friction). The influence of the interface adhesion on the load-deformation curve for a given segment of the reinforcement was indicated by an inflection point that corresponds to a compatibility force. The compatibility force is the force required to produce displacements at both ends of the segment. The load-deformation curves were bilinear for relatively weaker reinforcements and nonlinear for stronger reinforcements. The compatibility forces were used to back-calculate the reinforcement-soil interface adhesion and the angles of interface friction. The angles of interface friction were found to be inversely proportional to the squared root of the confining (overburden) stress level of the tests.