• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Evaluation of Rock Inclusion Geometrical Complexity and its Influence on Fracturing Process by AE Measurement

Research Project

Project/Area Number 10650912
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionMuroran Institute of Technology

Principal Investigator

ITAKURA Ken-ichi  Muroran Institute of Technology, Department of Computer Science and Systems Engineering, Associate Professor, 工学部, 助教授 (20168298)

Co-Investigator(Kenkyū-buntansha) SATO Kazuhiko  Muroran Institute of Technology, Department of Computer Science and Systems Engineering, Professor, 工学部, 教授 (30002009)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsAE / Acoustic Emission / Rock Fracture / Geometrical Complexity / Inclusion / Image Analysis of Cracks / Uniaxial Compressive Test / FEM
Research Abstract

Underground rock masses and rock slopes consist of various rock types having different physical properties and geometry. In such rock engineering sites, unexpected failures tend to occur when rocks containing inclusions are affected by stress change. Depending upon geometry and physical properties of the inclusion in matrix rock, stress concentration induces local fractures with acoustic emission (AE) and catastrophic failure can occur. To monitor an unstable rock area using AE techniques, it is therefore important to know the relationship between inclusion rock features and AE activity.
In this study, using cylindrical and plate-shaped rock specimens consisting of andesite and tuff, Brazilian and uniaxial compression tests were carried out to determine the relationship between AE source locations and complexity of inclusion geometry appearing on the surfaces of sliced specimen sections. Geometrical complexity was represented by some texture analysis indexes. Also, to evaluate local stress concentration areas, 2-D FEM analysis was conducted for the sliced specimen sections.
Experimental and analytical results are :
1. The number of AE events during loading was found to depend on the ratio of inclusion volume to the specimen. The AE waveform from the andesite area contained higher frequency components than the tuff area waveform.
2. Most AE sources were located along the eventual fracture plane ; some of them were located along the inclusion-matrix boundary which was estimated to concentrate local stress by FEM.
3. More AE sources were found to be present in sliced sections with a higher complexity index value of inclusion. It was believed that local stress concentration occurred in sections with a complex structure and that more microfracturing was therefore generated with AE.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 板倉賢一: "AE震源分布のフラクタル構造に基づいた岩石内き裂系のモデル化に関する研究"資源・素材学会. 114,12. 919-924 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 板倉賢一: "AE法による岩石破壊機構の同定"資源・素材関係学協会合同秋季大会講演資料. A1. 17-20 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 渡部義範: "応力下の岩石から発生するAEのフラクタル性とき裂画像観察に基づく3次元き裂分布モデルの構築について"第6回地下と土木のAE国内コンファレンス論文集. 6. 100-105 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 板倉賢一: "インクルージョンを有する岩石の破壊過程とAE活動について"資源・素材関係学協会合同秋季大会講演資料. A3. 81-84 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 高嶋厚志: "岩石供試体内のインクルージョン形状とAE発生特性について"第12回アコースティック・エミッション総合コンファレンス論文集. 12. 173-178 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ken-ichi ITAKURA: "Geometrical Complexity of Rock Inclusion and its Influence on AE Activity"Progress in Acoustic Emission. IIIX. 71-76 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ken-ichi ITAKURA: "Geometrical Complexity of Rock Inclusion and AE Activity"J.of Acoustic Emission. 19(in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ITAKURA Ken-ichi et al.: "Modeling Method for Cracks in Rocks based on the Fractal Structure of the AE Source Distribution."J.of the Mining and Matrial Processing Institute of Japan. 114. 918-924 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ITAKURA Ken-ichi et al.: "Understanding of Rock Failure Mechanism from AE Measurement Method"Proc.of Autumn Conf.of MMIJ and related Society. A1. 17-20 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] WATANABE Yoshinori et al.: "3-D Crack Distribution Model of Rock Specimen under Stress based on Fractal Structure of AE Source and Crack Image."Proc.of 6^<th> Domestic Conf.on Subsurface and Civil Eng.AE. 6. 100-105 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ITAKURA Ken-ichi et al.: "Fracturing Process and AE Activity of Rock Specimen with Inclusion."Proc.of Autumn Conf.of MMIJ and related Society. A3. 81-84 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] TAKASHIMA Atsushi et al.: "Inclusion Geometry of Rock Specimen and its Influence on AE Activity."Proc.of National Conf.on AE. 173-178 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ITAKURA Ken-ichi et al.: "Geometrical Complexity of Rock Inclusion and its Influence on AE Activity"Progress in Acoustic Emission. IIIX. 71-76 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] ITAKURA Ken-ichi et al.: "Geometrical Complexity of Rock Inclusion and AE Activity"J.of Acoustic Emission. 19(in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ken-ichi ITAKURA: "Geometrical Complexity of Rock Inclusion and its Influence on AE Activity"Progress in Acoustic Emission. IIIX. 71-76 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ken-ichi ITAKURA: "Geometrical Complexity of Rock Inclusion and AE Activity"J.of Acoustic Emission. 19(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 渡部義範: "応力下の岩石から発生するAEのフラクタル性とき裂画像観察に基づく3次元き裂分布モデルの構築について"第6回地下と土木のAE国内コンファレンス論文集. 6. 100-105 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 板倉賢一: "インクルージョンを有する岩石の破壊過程とAE活動について"資源・素材関係学協会合同秋季大会講演資料. A3. 81-84 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 高嶋厚志: "岩石供試体内のインクルージョン形状とAE発生特性について"第12回アコースティック・エミッション総合コンファレンス論文集. 12. 173-178 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 板倉賢一: "AE震源分布のフラクタル構造に基づいた岩石内き裂系のモデル化に関する研究" 資源・素材学会誌. 114,12. 919-924 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 板倉賢一: "AE法による岩石破壊機構の同定" 資源・素材関係学協会合同秋季大会講演資料. A1. 17-20 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi