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A THEORETICAL AND EXPERIMENTAL STUDY FOR ESTIMATING THREE-DIMENSIONAL IN-SITU STRESSES FROM CORE DISCING

Research Project

Project/Area Number 08405066
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

MATSUKI Koji  Dept.Geoscience and Technology, Tohoku Univ.professor, 大学院・工学研究科, 教授 (10108475)

Co-Investigator(Kenkyū-buntansha) OKUMURA Kiyohiko  Dept.Geoscience and Technology, Tohoku Univ.research associate, 大学院・工学研究科, 助手 (40177184)
SAKAGUCHI Kiyotoshi  Dept.Geoscience and Technology, Tohoku Univ.research associate, 大学院・工学研究科, 助手 (50261590)
KIYOHASHI Hiroshi  Dept.Geoscience and Technology, Tohoku Univ.associate professor, 大学院・工学研究科, 助教授 (70005263)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1997: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1996: ¥9,100,000 (Direct Cost: ¥9,100,000)
KeywordsCore discing / Three-dimensional in-situ stresses / Triaxial loading system / Saddle shaped disc / Tensile principal stress analysis / 真三軸試験装置 / ネットワークモデル / 三次元地圧力 / 引張主応力 / 引張主ひずみ
Research Abstract

The direction and the magnitude of tensile principal stresses within and below a long HQ core stub were analyzed with a finite element method for 77 in-situ stress conditions. 26 stress conditions were identified to be those under which core discing is likely to occur. A criterion for core discing was then proposed by evaluating the maximum tensile principal stress which is necessary for the contour plane to be formed throughout a cross-section of the core. A detail analysis on the distributions of the direction of tensile principal stresses showed that almost planar surfaces might be formed in the central part of the end surfaces of a dics and that large difference between the maximum and intermediate principal stresses might produce a so-called saddle shaped periphery. Summarizing the results obtained by the analysis, a procedure for determining principal in-situ stress directions from the geometry of a disc was proposed, based upon the symmetry of the end surfaces, the normal direction in the central part of the end surfaces and the direction of the concave or the convex axes in the end surfaces.
To verify the methods for estimating three-dimensional in-situ stresses from core discing, described above, experiments on core discing were carried out for Shirakawa welded tuff and Kimachi sandstone by loading a block containing a long core with a triaxial loading system. The criterion for core discing proposed in this study approximately estimated the stresses at which core discing initiated for Shirakawa welded tuff. However, the stresses predicted by the criterion did not coincide with the experimental results for Kimachi sandstone, for which the core discing was accompanied by compressive failure at the borehole bottom. A saddle shaped dicing was not observed for these rocks even if two horizontal stresses were different.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 本郷公・松木浩二・坂口清敏: "一般的地圧下におけるコアディスキングの発生条件" 資源・素材学会誌. 113巻・3号. 155-161 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松木浩二・本郷公・坂口清敏: "引張主応力解析に基づくコアディスキング形状と三次元地圧の関係" 資源・素材学会誌. 113巻・5号. 317-324 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Matsuki, K.Hongo and K.Sakaguchi: "A tensile principal stress analysis for estimating three-dimensional in-situ stresses from core discing" Proc.the International Symposium on Rock Stress. 343-348 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 鈴木誉・奥村清彦・坂口清敏・松木浩二: "コアディスキング発生条件に関する実験的研究" 資源・素材学会誌. 投稿予定. 155-161 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hongo, K.et al.: "A criterion on core discing in the general state of in-situ stresses" Journal of The Mining and Materials Processing Institute of Japan. 113-3. 155-161 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Matsuki, K.et al.: "The relationship between the shape of a disced core and three-dimensional in-situ stresses estimated by a tensile principal stress analysis" Journal of The Mining and Materials Processing Institute of Japan. 113-5. 317-324 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Matsuki, et al.: "A tensile principal stress analysis for estimating three-dimensional in-situ stresses from core discing" Proc.the International Symposium on Rock Stress, Kumamoto. 343-348 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Suzuki, H.et al.: "Experimental study on the stress conditions for core discing under a general state of in-situ stresses" Journal of The Mining and Materials Processing Institute of Japan. (to be submitted). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 鈴木 誉・松木浩二 他: "コアディスキングの発生条件に関する実験的研究" 資源・素材学会春季大会講演集. 106-106 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 本郷公 他: "一般的地圧下におけるコアディスキングの発生条件" 資源と素材. 113巻3号. 155-161 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 松木浩二 他: "引張主応力解析に基づくコアディスキング形状と三次元地圧の関係" 資源と素材. 113巻5号. 317-324 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Matuki et al: "A tensile prnciprl stress amalysis for estinating three-climemsal in-situ stresses from cove discing" Rock Slress (Proc.Int.Synpo.in Rock Stress). 343-348 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 本郷公 他: "一般的地圧下におけるコアディスキングの発生条件" 資源と素材. (掲載予定)3号. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 松本浩二 他: "引張主応力解析に基づくコアディスキング形状と三次元地圧の関係" 資源と素材. (掲載予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hatuski. K. et al.: "A tensile poincipal stress analysis for estimating three-demensional in-situ stresses from core ciscing" Proc. Int. Synpo. on Rock Stress. (in press). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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