EFFECT OF BREATHABLE-WATERPROOF GEOTEXTILE ON PREVENTION OF THE PORE-AIR BLOW IN RIVER DIKE

Abstract

It has been pointed out that the pore-air blows off from the surface of river dike during heavy rainfall. It is therefore important to consider the influence of the pore-air blow on the stability of the dike. Based on the laboratory water infiltration experiment in the unsaturated soil column, we found that the pore-air pressure in the soil was generated by the seepage of the water when the air permeability at near the surface was reduced by the rainfall. The pore-air blow occurred due to the larger pore-air pressure. In this paper, the effectiveness of the breathable-waterproof geotextile on prevention of the pore-air blow is experimentally examined. As a result, it is shown that the pore-air blow is prevented in while keeping the air permeability at near the surface by laying the geotextile at the ground surface.