抄録
This paper presents the response of unreinforced and geosynthetic reinforced dry sand under static and dynamic loading conditions. A large scale triaxial apparatus, capable of testing specimens having a maximum size of 300 mm in diameter and 600 mm in height was used for the study. Large specimen size used in this study allowed to overcome the boundary effects present in triaxial testing of reinforced sands. A series of triaxial compression tests were performed on unreinforced and reinforced sand specimens to investigate the effect of the quantity of geotextile reinforcement on the mechanical behavior of sand. A woven geotextile was used in layers to reinforce the sand. Number of reinforcing layers was varied from one to six in different tests. It was observed that under static conditions the peak shear strength and stiffness increased with the inclusion of geotextile layers. Reinforcement benefit ratio increased with the number of layers but decreased with the increase in confining pressure, indicating that the reinforcement layers are more effective at low confining pressures. Cyclic triaxial tests were carried out at 1 Hz frequency and 4 kN cyclic load. Reinforced specimens exhibited substantially higher dynamic moduli compared to the unreinforced sand.
