Effects of Levee Materials on Resistance Against Overflow Erosion for GRS Levee

Abstract

〒278-8510 千葉県野田市山崎2641) 2 正会員 (株)日水コン 名古屋下水道部 技術第一課 (〒456-0002 愛知県名古屋市熱田区金山町1-7-5) 3 正会員 博(工) 東京理科大学准教授 理工学部土木工学科 (〒278-8510 千葉県野田市山崎2641) 4 非会員 東京理科大学 理工学部土木工学科(同上)Recent extreme flood affected huge flood disaster with a large number of levee breaches which were mainly caused by overflow erosion. For increasing the resistance of levee to overflow erosion with attention to fine fraction of levee materials, we examine the resistance of armored and GRS (Geosynthetic-Reinforced Soil) levees. Various laboratory tests were conducted to evaluate the resistance of this method to overflow erosion. The results indicated that 1) the resistance of armored and GRS levees have high resistance against overflow erosion with the increase of fine fraction of levee materials mainly due to low permeability and high cohesion of fine sediment and 2) the GRS levee with fine sediment maintained the height of the levee during a longer duration than that with sand.