Study on the solidification experiment of long term settlement clay using Urease

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630222
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Takenaka Corporation, Takenaka Research and Development Institute
• Principal Investigator: Kaneda Kazuhiro 株式会社竹中工務店 技術研究所, その他部局等, 研究員(移行) (30314040)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 微生物触媒 / ウレアーゼ / 炭酸カルシウム / 粘性土 / 遅れ沈下 / 固化 / 骨格構造

Outline of Final Research Achievements

This research relates to reinforcement and repair of natural sedimented clay soils. The long-term settlement has occurred among embankment structures built on natural sedimented clay ground. Once settlement occurs, the cost of measures becomes huge, which is now a big problem. The long term settlement is caused by the softening accompanied by de-structured of the soil skeleton exceeding the preceding consolidation stress. Until now, countermeasures such as repair by overlay to make lightweight embankment, promotion of consolidation by drain installation are being implemented, but the effect is insufficient.
The purpose of this research is to precipitate calcium carbonate by inputting the elements such as urease and calcium in the clay soils to restore and strengthen the soil skeletal structure and deter lag settlement.

Free Research Field

地盤工学