2021 Fiscal Year Final Research Report
Development of new slope protection technologies using biocementation by focusing on locality
| Project/Area Number |
19H02229
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 地域性 / バイオセメンテーション / 法面 / 炭酸カルシウム / ウレアーゼ |
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| Outline of Final Research Achievements |
This study aimed to develop a new slope protection method of CaCO3 precipitation to solidify the surface soil of a slope, and to confirm the effectiveness of this method by focusing on the regional characteristics of microorganisms inhabiting the soil around the application site of the slope protection works.
A bacterial strain suitable for CaCO3 precipitation was identified in the surface soil of a slope in Hokkaido, Japan through screening for ureolytic bacteria suitable for biocementation in cold regions. The CaCO3 precipitation characteristics of this bacterial strain were investigated, and laboratory solidification tests using syringes and slope models were conducted using geomaterials with different particle size distributions. Furthermore, a field trial was conducted on the surface soil of a slope in Hokkaido, Japan. In conclusion, the effectiveness of the newly developed method was confirmed.
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| Free Research Field |
地盤環境工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の主な特徴は，自然界で生物が生成する鉱物（バイオミネラル）の1つであるCaCO3を地盤の固化材料として利用している点にある。すなわち，法面保護工で用いられているモルタルやコンクリートの材料であるセメントを使用せず，そして施工対象となる現場周辺の地盤に生息する微生物の地域性に着目し，寒冷地においてCaCO3の析出に適した菌株を活用したバイオセメンテーションにより法面表層地盤を固化させる新しい技術であり，法面の保護・保全に関する対策技術として有効な選択肢が増えることにつながる。
得られた研究成果は，低環境負荷で景観に配慮した持続可能な新しい法面保全技術としての適用が期待される。
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