Development of embankment erosion model considering effect of cohesive soil on critical non-dimensional shear stress

2015 Fiscal Year Final Research Report

• Project/Area Number: 26820197
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Saitama University
• Principal Investigator: YAGISAWA Junji 埼玉大学, 理工学研究科, 准教授 (70549998)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 粘性土 / 移動限界 / 含水比 / 細砂含有率

Outline of Final Research Achievements

For preventing the embankment breaching, to elucidate erosion mechanism of the embankment is quite important. In previous research, erosion characteristics of cohesive soil has been investigated by changing water content. However, water content of embankment in vertical direction should be changed at the flood event. Therefore, the objective of this study is to elucidate the effect of vertical distribution of water content of cohesive soil on non-dimensional critical shear stress by conducting flume experiment.
In the experiment, well-mixed fine sand and O.A. Clay were used as cohesive soils. Initial water content of cohesive soil was set around 30%. Four water content sensors set at 1cm (L1), 2cm (L2), 4cm (L3) and 8cm (L4) from the initial surface respectively. As a result of experiment, water content was increased only L1 layer. Non-dimensional critical shear stress of cohesive soils decreased with increasing the water content gradient between L1 and L2 layer.

Free Research Field

水工水理学