Ground improvement technique using oyster shells and micro-organisms which live in Japan

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560614
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Kure National College of Technology
• Principal Investigator: KANO Seiji 呉工業高等専門学校, 環境都市工学分野, 教授 (40280408)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 地盤改良 / 微生物 / ビーチロック / 牡蠣殻 / 圧縮強度

Outline of Final Research Achievements

Soil improvement techniques using microorganisms have recently been focused on as the low cost and environmentally friendly technique for practical use in Japan. Sporosarcina pasteurii is mainly used for this technique in almost all researches. In this paper, three laboratory tests were carried out to examine urease microorganisms which live in Japan for this bio-treatment technique. Results revealed that the urease microorganisms were found in all natural beach rocks from Okinawa that these microorganisms could reproduce calcium carbonates in soil. It was also found that the unconfirmed compression strength of the specimen treated with microorganism from beach rocks showed almost the same strength as the one with Sporosarcina Pastuerii. Therefore this microorganism is useful for the bio-treatment technique, instead of Sporosarcina pasteurii. Furthermore dissolved oyster shells can be used to this technique as a Calcium ion.

Free Research Field

地盤工学