Experimental study on behavior of interface between soil and geotextile

A series of tests were performed to investigate the monotonic and cyclic behavior of the interface between geotextile and soil. A functional module for geotextile drawing test was appended to a large scale cyclic test apparatus for soil-structure interface. The monotonic and cyclic shear tests of the interface between geotextile and gravel as well as geotextile drawing tests were conducted with the apparatus. The interface was found to exhibit strain-softening and obvious aeolotropic normal displacement which was affected by the normal stress. The drawing test results show that the shear strength of the interface is not proportional to the normal stress because of its dilatancy behavior due to shear application. The combination of the shear test and geotextile drawing test is recommended as a rational test approach for a comprehensive understanding of the behavior of soil-geotextile interface.