Research on In-soil Tensile Test of Geosynthetics

The soil-reinforcement technology in geosynthetics has become a wildly acceptable approach for constructing soil structure. Homever,the test technique for the geosynthetics is much backward compared with engineering application.For example,there are significant differences between the results of regular tensile test in air and in-soil tensile test for the geosynthetics.In this paper,study on the tensile response test of geosynthetics in-soil using a new developed multifuncational geosynthetics in-soil tensile apparatus under different confinement conditions is done.The in-soil tensile properties of five different geosynthetics under four normal loads are tested. The results show that the differences of test curves between in-air and in-soil tests are big,especially for nonwoven geotextile as reinforce.Because the normal loading on both sides of tensile materials equals a function of side confinement,the secant modulus of geosynthetic incrase significantly.