Development of analytical procedure using phenomenalistic mathematical model for phase change-dependent geotechnical hazards in snowy cold regions

2014 Fiscal Year Final Research Report

• Project/Area Number: 24651204
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster science
• Research Institution: Hokkaido University
• Principal Investigator: ISHIKAWA Tatsuya 北海道大学, 工学(系)研究科(研究院), 教授 (60359479)
• Co-Investigator(Kenkyū-buntansha): KIMURA Ichiro 北海道大学, 大学院工学研究院, 准教授 (60225026)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 土砂災害 / 地盤工学 / 水工水理学 / 防災 / 積雪寒冷地

Outline of Final Research Achievements

This research develops an analytical procedure using a phenomenalistic mathematical model for the phase change-dependent geotechnical hazards in snowy cold regions by performing experimental and analytical studies. First, we established a new testing method for model tests on soil grounds subjected to freeze-thaw actions and seepage flow, and revealed that seepage pressure and frost-susceptibility and water retention-permeability characteristics of geomaterials seriously influenced the seepage erosion behavior of freeze-thawed soil ground. Next, we developed a numerical model to simulate this seepage erosion phenomenon with the framework of hydraulic erosion and overhanging failure by a triple-grid approach. Since the numerical results showed a good agreement with the experimental results, we concluded that the newly proposed analytical procedure is applicable to a freeze-thaw and seepage-erosion complex geotechnical hazards, which may occur in the snowy cold regions.

Free Research Field

地盤工学