CHARACTERISTICS OF AIR-PERMEABLE WATER-PROOF GEOSYNTHETICS FOR COUNTERMEASURE AGAINST SEEPAGE FAILURE OF RIVER DIKE

Abstract

This paper studies a countermeasure method against seepage failure of the river dike by covering with the geosynthetics having air permeable and water proof properties. The influence of the placement of the geosynthetics on the behavior of pore-air and pore-water in the river dike was examined based on the laboratory experiment assuming the infiltration of the rainfall and river water into the unsaturated soil. An improved geosynthetics with enhanced the air permeability and the water proof as compared with the one in our previous study was used. As a result, it was recognized that the placement of the improved geosybthetics prevented the pore-air pressure generation and of the rainfall infiltration.