EVALUATING IN-SOIL AND PLANE HYDRAULIC TRANSMISSIVITY OF GEOSYNTHETICS DRAINS BY LABORATORY TEST

In an attempt to reduce the risk for embankment failures induced by recent heavy rainfalls, geotechnical engineers are increasingly concerned with proper method for geosynthetic drains in an embankment. In such case, the in-plane hydraulic transmissivity could be deteriorated implying that clogging of the geosynthetic drains and/or the cross sectional area of the geosynthetic drains could be decreased by the compressive overburden stress. In engineering practice, thus it is great importance to evaluating the performance of geosynthetic drains in soil. In so doing, the in-soil hydraulic transmissivity of geosynthetics drains should be properly measured in the laboratory. In this study, the hydraulic transmissivity evaluated under different overburden pressures is focused on the variation of the cross sectional area of drainage material. Modified in-soil test apparatus after JGS(plan) is used with or without three kinds of soils showing different soil particle grading. In this study, the hydraulic transmissivity under different overburden pressures is evaluated. The tests focused on the variation of the cross sectional area of drainage material. Modified in-soil test apparatus after JGS(plan) is used with or without three kinds of soils showing different soil particle grading.