Abstract
The reinforcement and separation are important functions for geotextiles used in road construction on the soft ground. In this paper, we experimentally investigated concentrating on the separation function, and had a try to represent the function quantitatively. The cyclic loads were employed to the test specimens, the settlement, pore pressure and the mixing between the subbase layer and the subgrade soil were measured. The needle-punched non woven had a enough strength and showed an excellent effect on the separation. As the result of considering the relationship between the separation and reinforcement function of geotextiles, it is obtained that the separation was principal function in road construction on soft ground.
