Developing a extremely cost effective liquefaction countermeasure

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289148
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Ehime University
• Principal Investigator: Okamura Mitsu 愛媛大学, 理工学研究科, 教授 (50251624)
• Co-Investigator(Kenkyū-buntansha): YASUHARA Hideaki 愛媛大学, 大学院理工学研究科, 順教授 (70432797)
• Co-Investigator(Renkei-kenkyūsha): HAYASHI Kazuyuki 和歌山工業高等専門学校, 准教授 (30587853)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 液状化 / 液状化対策 / 飽和度 / 砂 / 地震

Outline of Final Research Achievements

In order to obtain soil samples from the foundation soil just below a highway embankment where in-situ air injection had been conducted to desaturate the ground as a liquefaction countermeasure, a simple and cheap ground freezing method has been developed. Frozen samples will be taken from the ground wi the method in a near future to directly measure distribution of degree of saturation.
The durability of the desaturated soils, which is one of the concerns of the technique, depends on the sustainability of the injected air in the soil pore. To evaluate the evolution in degree of saturation (which ensures the longevity of injected air) numerical simulations were conducted considering advection and the molecular diffusion process of mass transfer by using the multiphase flow simulation model (TOUGH2) based on the finite difference method (FDM). It is confirmed that the unsaturated condition of the site will last more than 200 years.

Free Research Field

地盤工学