EVALUATING WATER PERMEABILITY OF AIR-PERMEABLE WATER-PROOF GEOSYNTHETICS LAID ON RIVER DIKE DURING OVERTOPPING

Abstract

In order to increase the resistance of river dike against seepage failure and overtopping erosion during flood, we proposed covering the river dike with the air-permeable water-proof geosynthetics as a countermeasure. In this paper, the waterproof performance of the joint part of geosynthetics was evaluated based on the laboratory experiment. The joint part of the geosynthetics can be a weak point during overtopping because it may allow some water infiltrate into the dike and erosion occurs. From the experiment, it was found that the geosynthetics prevented the overtopping water leakage completely when the joint was glued.