Shear Test for Geotextile-Soil Systems

Abstract

Direct shear tests have been done with a large scale shear testing apparatus, in order to investigate the shearing characteristic between geotextile and soil, which is one of the basic and very important properties in application of geotextiles to the earth works. Tests have been carried out with three types of geotextiles, varying soil conditions and codition of shear test.
The results are following; First, the friction angle between plastic net and soil, and also non-woven fablic and soil can be considered nearly equal to the angle of shear of soil, regardless of the difference of water content of soil or soil types. On the contrary, geomenbraine shows lower angle of friction on condition of wet soils. And, with cohesive soils, any type of geotextiles indicate the same aparent cohesion as soil.
Further consideration has been added, on the basis of the resuls above, to the estimation of ancor length of geotextiles against the pull-out force.