Geotextile or goecomposite drain sheets are used commonly for collecting and draining the seepage water in an embankment or the pore water in a cohesive soil with high moisture content. In these cases the combined hydraulic characteristics of the multi-layered structure depend on both the permeability of soil and the transmissivity in plane direction and the permittivity in cross-plane direction of a geodrain sheet. In this study a laboratory two dimensional model test is conducted for a cohesive soil embankment in which a geotextile is placed. The effects of thickness of geotextile, overburden pressure and degree of compaction (i.e. soil density and permeability) on the hydraulic properties of the models are investigated and the results of tests and the interaction between the geotextile and the soil conditions are discussed.

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Geotextile, which is a sheet-like drainage or permeable material in both a normal direction to the plane and its cross-sectional direction, is often applied recently to the usage of the embankment constructed using a high moisture content cohesive soil including a poor surplus soil produced in a construction site or the backfilling material needed to be dewatered in cases of fully saturated condition. In this study a laboratory model test experiment is carried out to investigate a fundamental hydraulic behavior of soil-geotextile composite system and the effects of thickness of spunbonded geotextile, overburden pressure, different gradation of soil, degree of compaction (apparent density of soil on tansmissivity and permittivity of the complex system.