IN-SOIL HYDRAULIC TRANSMISSIVITY OF GEOSYNTHETIC DRAINS IN THE LABORATORY

摘要

When geosynthetics such as plastic board drains are employed for drainage material in embankment, the drainage ability could be deteriorated owing to the sustained earth pressure, implying that the cross sectional area of the geosynthetics could be decreased by the compressive overburden stress. In engineering practice, it is thus of great importance to evaluate the in-soil performance of geosynthetic drains. In so doing, the in-soil hydraulic transmissivity of geosynthetic drains should be properly measured in the laboratory. In this paper, the hydraulic transmissivity of two types of plastic board drains was carefully examined in the laboratory by using fine-grained clay, poorly graded fine sand and well-graded granular material.