Study on mechanism of failure of slope with frozen surface layer due to earthquake and its estimation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820194
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Tomakomai National College of Technology
• Principal Investigator: Tetsuya Tokoro 苫小牧工業高等専門学校, その他部局等, 准教授 (40610457)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 液状化 / 表層凍結 / 振動台実験

Outline of Final Research Achievements

This research intends to clarify the mechanism of the geotechnical disaster induced by earthquakes in the situation that surface is frozen in cold regions. we conducted a series of shaking table tests for the model that has frozen surface layer. We also conducted temperature-controlled direct shear test to estimate the mechanical characteristics at the frozen/unfrozen soil interface.According to the results obtained, the behavior of the excess pore water pressure under frozen surface is different from that of an unfrozen model because the frozen surface layer obstructs the drainage of water. Furthermore, compared with that for the unfrozen condition, the shear strength under frozen-surface is higher, and the internal friction angle is also larger. Therefore, we conclude that the undrained situation due to frozen surface layer and the increase in shear strength at the interface strengthen the resistance against liquefaction.

Free Research Field

地盤工学