Development of a warning index to stability of slopes due to rainfalls

2014 Fiscal Year Final Research Report

• Project/Area Number: 23580327
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Irrigation, drainage and rural engineering/Rural planning
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: KOHGO YUJI 東京農工大学, (連合)農学研究科(研究院), 教授 (30414452)
• Co-Investigator(Kenkyū-buntansha): SAITO Hirotaka 東京農工大学, 大学院農学研究院, 准教授 (70447514)
• Co-Investigator(Renkei-kenkyūsha): HORI Toshikazu 農研機構, 農村工学研究所, 研究室長 (20414451) ; HAYASHIDA Yoichi 農研機構, 農村工学研究所, 主任研究員 (50414454)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 降雨 / 斜面崩壊 / 不飽和土 / 弾塑性モデル / 飽和不飽和圧密解析 / 斜面模型実験

Outline of Final Research Achievements

The object of this research project is to develop a warning index to stability of slopes with the mechanical data of soils. In order to conduct it, we at first conducted following two points. The first one is to conduct 1g failure model tests due to rainfalls, and the second one is to develop slope stability analysis methods based on saturated and unsaturated consolidation analysis methods. It was found from the experimental tests that the saturated zones appear from the toes of the slopes and the failures start from the parts. The analysis method could simulate well the experimental results. It was found that the pore water pressure values measured at the toes of slopes are efficient as a warning index. However it takes much times and costs to measure them. It was found that it is very important to protect the toe parts of slopes.

Free Research Field

地盤工学