Study on the application of Liquefied Stabilized Soil reinforced with fiber material for ground disaster prevention

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04590
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: Muroran Institute of Technology
• Principal Investigator: Kohata Yukihiro 室蘭工業大学, 大学院工学研究科, 教授 (90215301)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 地盤防災 / 流動化処理土 / 埋戻し材 / 繊維材補強 / 泥水密度 / 養生日数 / 変形特性 / 強度特性

Outline of Final Research Achievements

It has been reported that increasing the amount of solidifier added to a Liquefied Stabilized Soil increases its strength and causes brittle behavior, which may reduce its seismic resistance, and that mixing fiber material improves the brittle properties after the peak. In this study, triaxial compression tests were conducted on in-situ and laboratory cured specimens to compare and investigate the effects of slurry density and curing time on the strength and deformation properties of fluidized treated soil mixed with fiber material. The results showed that the strength of the Liquefied Stabilized Soil tended to increase with the number of curing days, and the effect of the number of curing days increased with the mixing of the fiber material. The effect of curing time was more pronounced in the case of mixing fiber material, and the degree of damage tended to decrease as the curing time increased.

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

地盤防災対策の一つとして，液状化が想定される地盤に埋戻し材として流動化処理土を用いる場合には，その脆性的な力学挙動を改善，かつ耐震性を向上させた流動化処理土を用いることにより，耐震性のある地盤を構築することが重要な課題となっている．本研究によって，流動化処理土を地盤防災対策に適用する際には，配合設計基準図で得られる泥水密度範囲においては，より大きな泥水密度を選択すること，繊維材で補強すると初期剛性が大きくなることなどが明らかにされ，繊維材で補強された流動化処理土を地盤防災対策として適用することは，粘り強い地盤を造成するという観点から，大変有用な手法であることが明らかとなり，社会的意義が大きい．