Development of a new self-healing soil improvement technology based on failure mechanism in micro-scale

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04696
• 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: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: Takano Daiki 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, グループ長 (80626218)
• Co-Investigator(Kenkyū-buntansha): 野々山 栄人 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), システム工学群, 准教授 (00624842) ; 宮田 喜壽 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), システム工学群, 教授 (20532790)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 固化処理土 / 可視化 / 微生物固化 / X線CT

Outline of Final Research Achievements

Improved soils that have failed due to external factors are generally considered to have lost their function and are completely rebuilt. In this case, control and repair from the early stages of failure and reinforcement with ductile materials to compensate for brittle properties enable effective inspection and repair, leading to a longer service life of the soil structure.In this context, it is necessary to clarify the strength properties and strength recovery characteristics of cement modified soil with self-healing function. In this study, as a basic research to solve this academic problem, cement modified clay with self-healing function was prepared, and loading tests and laboratory model tests were conducted to investigate its strength properties and strength recovery characteristics.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

本研究は改良土が有する破壊に対する弱点を効率的に克服かつそれを修復する機能を付与する補強手法を提案し，土構造物の長寿命化に資することを目的としている．一旦，外的要因により破壊に至った改良土はその機能を失ったとみなされ，全面的に再構築されることが一般的である．この際，破壊の初期段階から制御や修復を行い，脆性的な性質を補う延性的な材料へと補強することが効果的な検査・補修を可能とし，土構造物の長寿命化へとつながる．