Development of a method to evaluate permeability of rock using barometric fluctuation

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02238
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: Saitama University
• Principal Investigator: Osada Masahiko 埼玉大学, 理工学研究科, 教授 (00214114)
• Co-Investigator(Kenkyū-buntansha): 竹村 貴人 日本大学, 文理学部, 教授 (30359591) ; 富樫 陽太 埼玉大学, 理工学研究科, 助教 (90753294)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 岩盤の浸透特性 / 大気圧変動 / 間隙空気圧 / モンテリ地下研究所 / オパリナスクレイ / 時系列解析

Outline of Final Research Achievements

In order to properly assess groundwater scenarios for HLW geological disposal projects, it is important to evaluate the hydraulic properties and their temporal changes in the excavation-damaged zone. In this study, field measurements and laboratory experiments were carried out with the aim of developing a method that can be used to continuously measure changes in rock hydraulic properties over a long period of time and that can be measured anywhere in the tunnel by utilizing atmospheric pressure fluctuations, which change daily as a natural phenomenon, as an external force for assessing hydraulic properties. The results showed that atmospheric pressure fluctuations can be used to evaluate the hydraulic properties at the tunnel wall. It was also shown that multi-point measurements could be used to evaluate the anisotropy of hydraulic properties of sedimentary rocks.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

岩盤の浸透特性は，様々な社会基盤を創成するうえで，必要な物性値である。本研究の成果により，簡便に，安価に，岩石の浸透特性をその異方性を含めて評価できるようになったことは，有用と考えられる。さらに，地層処分プロジェクトにおいては，経時変化を踏まえた物性評価が必要であり，これに貢献しえる手法を提案できたと考えている。