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Stability evaluation during mountain tunnel excavation considering spatial heterogeneity of geomechanical properties

Research Project

Project/Area Number 21K14382
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 25020:Safety engineering-related
Research InstitutionMatsue National College of Technology

Principal Investigator

Okazaki Yasuyuki  松江工業高等専門学校, 環境・建設工学科, 准教授 (50806081)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords山岳トンネル / 空間的不均質性 / 地盤物性 / 数値解析 / 安定性評価 / 山岳ト ンネル
Outline of Research at the Start

地盤は天然材料であるがゆえに,地盤物性が空間的に不均質な状態となっている.しかしながら,数値解析を用いて山岳トンネルの支保設計を行う場合,地盤物性の空間的な不均質性はモデル化に反映せず,地盤の各地層を均質な材料と仮定するのが一般的である.そのため,現状の数値解析を用いた山岳トンネルの支保設計は,地盤物性の空間的な不均質性がトンネル掘削時の安定性に及ぼす影響に関するリスク評価を十分にできていないと考えられる.
そこで本研究では,地盤物性の空間的な不均質性を確率場理論に基づいて考慮した連続体解析を用いて,地盤物性の空間的な不均質性が山岳トンネル掘削時のトンネルの安定性に及ぼす影響を確率的に評価する.

Outline of Final Research Achievements

In this study, the tunnel excavation analyses considering spatial heterogeneity of geomechanical properties was carried out to contribute to advancement of mountain tunnel design by numerical analysis. the effects of degree of heterogeneity and difference in design conditions in heterogeneous ground on tunnel stability during tunnel excavation were evaluated.
As a result, it was possible to calculate the probability of exceeding the critical shear strain that is stability index of mountain tunnels for each analysis case. Based on these results, it was considered that if the degree of heterogeneity and design conditions could be grasped in advance, it was possible to easily estimate the collapse risk of tunnel and utilize the results of this study for judgment on design change.

Academic Significance and Societal Importance of the Research Achievements

現状の数値解析を用いた山岳トンネルの設計は,地盤物性の空間的な不均質性がトンネルの安定性に及ぼす影響に関するリスク評価を十分にできていないと考えられる.実際に近年でも,数値解析による設計時の地盤物性の空間的な不均質性に関する評価不足が山岳トンネルにおける事故発生要因の1つとなっている場合がある.
そこで,本研究では,地盤物性の空間的な不均質性を考慮したトンネル掘削解析を実施し,不均質地盤におけるトンネルの崩壊リスクを簡易的に推定できるようにした.これを活用することで,地盤物性の空間的な不均質性に関するリスク評価をより詳細に実施できるようになると考えられる.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Open Access: 1 results,  Peer Reviewed: 2 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effect of spatial heterogeneity of geomechanical properties on stability of tunnel face2023

    • Author(s)
      Y. Okazaki, T. Fukuma, M. Ohya, S. Morimoto, H. Hayashi, M. Shinji
    • Journal Title

      Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World

      Volume: - Pages: 811-819

    • DOI

      10.1201/9781003348030-98

    • ISBN
      9781003348030
    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] Effects of Spatial Heterogeneity of Geomechanical Properties on Tunnel Behaviour during Tunnel Excavation2022

    • Author(s)
      Yasuyuki Okazaki, Hisashi Hayashi, Shingo Morimoto, Makoto Ohya, Masato Shinji
    • Journal Title

      Proceedings of the ITA-AITES World Tunnel Congress 2022

      Volume: P1053

    • Related Report
      2022 Research-status Report
  • [Journal Article] EFFECT OF SPATIAL HETEROGENEOUS DISTRIBUTION OF GEOMECHANICAL PROPERTIES ON STABILITY OF TUNNEL FACE2022

    • Author(s)
      OKAZAKI Yasuyuki、HAYASHI Hisashi、FUKUMA Tomoya、MORIMOTO Shingo、OHYA Makoto、SHINJI Masato
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. F2 (Underground Space Research)

      Volume: 78 Issue: 1 Pages: 22-32

    • DOI

      10.2208/jscejusr.78.1_22

    • ISSN
      2185-6583
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 地山物性の空間的な不均質性が山岳トンネル掘削時の天端沈下量に及ぼす影響2022

    • Author(s)
      岡崎泰幸、大屋誠、林久資、進士正人、森本真吾
    • Journal Title

      建設機械

      Volume: 58 Pages: 39-46

    • Related Report
      2021 Research-status Report
  • [Journal Article] 地山の空間的不均質性が山岳トンネル掘削時挙動に及ぼす影響2021

    • Author(s)
      岡崎泰幸、林久資、進士正人
    • Journal Title

      トンネルと地下

      Volume: 52 Pages: 71-78

    • NAID

      40022716877

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Effect of spatial heterogeneity of geomechanical properties on stability of tunnel face2023

    • Author(s)
      Y. Okazaki, T. Fukuma, M. Ohya, S. Morimoto, H. Hayashi, M. Shinji
    • Organizer
      ITA-AITES World Tunnel Congress 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of Spatial Heterogeneity of Geomechanical Properties on Tunnel Behaviour during Tunnel Excavation2022

    • Author(s)
      Yasuyuki Okazaki, Hisashi Hayashi, Shingo Morimoto, Makoto Ohya, Masato Shinji
    • Organizer
      ITA-AITES World Tunnel Congress 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 地山物性の空間的な不均質性が切羽の安定性に及ぼす影響2022

    • Author(s)
      岡崎泰幸、福間友哉、大屋誠、森本真吾、林久資、進士正人
    • Organizer
      土木学会第77回年次学術講演会
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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