Effective use of soil generated from disaster waste as a geomaterial considering the decay process of wood chips

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630199
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Nagoya University
• Principal Investigator: NAKANO Masaki 名古屋大学, 工学(系)研究科(研究院), 教授 (00252263)
• Co-Investigator(Kenkyū-buntansha): NONOYAMA Hideto 名古屋大学, 工学研究科, 助教 (00624842)
• Co-Investigator(Renkei-kenkyūsha): KATAYAMA Arata 名古屋大学, エコトピア科学研究科, 教授 (60185808)
• Research Collaborator: OHTSUKA Yoshikazu (株)奥村組, 土木本部土木統括部環境技術室 ; OHTSUKA Yoshikazu 日本国土開発(株), 技術センター土質・地盤研究室 ; ARAKI Takeru 名古屋大学, 工学研究科 ; HAMAJIMA Keisuke 名古屋大学, 工学研究科 ; JIN-NO Takuma 名古屋大学, 工学部
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 地盤材料学 / 締固め / 一軸圧縮強さ / 災害廃棄物 / 特殊土 / 有効利用

Outline of Final Research Achievements

Shear strength tests were carried out on soil samples mixed with tsunami disaster waste deposits containing wood chips. 3 kinds of mixing rates were used on 2 kinds of soils of different soil densities and the results showed ductile shear behavior with a reduction in unconfined compressive strength and stiffness with the higher mixing rates of wood chips.
While taking into consideration of the decay process of wood chips, 2 kinds of tests were carried out. One was to mix the soil sample with sterilized wood chips and keep it in a constant temperature and humidity room before the shear test. For this, at fixed moisture content, the strength remained constant even after 13 months. The other was to mix and keep the soil with decaying wood chips in the same room before shear test and here, even though the strength decreased with the decay process, the compacted soil around the chips inhibited the chips from decaying and consequently, the strength was constant within the first 4 months.

Free Research Field

地盤工学