Study on improvement of log piling method for liquefaction mitigation by adding special functions

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420489
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Fukui National College of Technology
• Principal Investigator: Yoshida Masaho 福井工業高等専門学校, 環境都市工学科, 教授 (90210723)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 地震 / 液状化 / 木材 / 間隙水圧消散

Outline of Final Research Achievements

Although a countermeasure against liquefaction using logs is aiming at increasing the density of loose sandy ground, it allows that some layers partially liquefy against Level 2 earthquake ground motions. The log with drainage function based on a water pressure dissipation method was proposed by opening holes in a core and on the surface of the log. The principle of the method is to dissipate water pressure when an excess pore water pressure increases by Level 2 earthquake ground motions. Permeability tests and small scale shaking table tests were conducted to evaluate the effectiveness of the piling log with drainage function. As a result, the log with drainage could reduce the rate of accumulation of excess pore water pressure and increase the velocity of its dissipation by its high permeability. Furthermore, the settlement of lightweight structure could be mitigated because the effect of log with drainage improved liquefaction resistance.

Free Research Field

地震工学