Abstract:

                             The use of geosynthetics is to improve the performance of foundations when constructing on soft compressible foundation soils. The material properties of geosynthetics are important to their use in various applications. Geosynthetics have become well established construction materials for geotechnical and environmental applications in most parts of the world. This report presents a vertical pullout test (VPT) developed to measure the peak interface friction angle and cohesion between soil and planar geosynthetic products. Two types of geo-synthetic material of different sizes (150mm by 150mm and 300mm by 300mm) were evaluated using the pullout test. Series of pull-out tests were performed to study the interface characteristics between geogrids and soils. Two geogrids were used to investigate the interaction properties with clay. The function of geogrid reinforcement and the geogrid-soil interaction mechanism were mainly studied by experimental methods.

KEYWORDS - geo-synthetic material, cohesive soil, vertical pull-out test, triaxial shear test.