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Study on groundwater flow and transport properties considering the structural change of fracture system in rock masses.

Research Project

Project/Area Number 07454119
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionSaitama University

Principal Investigator

WATANABE Kunio  Saitama Univ., Engineering, Assoc.Prof., 工学部, 助教授 (00008880)

Co-Investigator(Kenkyū-buntansha) TOKUNAGA Tomochika  Univ.of Tokyo, Engineering, Res.Assoc., 工学部, 助手 (70237072)
OSADA Masahiko  Saitama Univ., Engineering, Res.Assoc., 工学部, 助手 (00214114)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1995: ¥5,300,000 (Direct Cost: ¥5,300,000)
Keywordsrock masses / fluid flow path / fracture system / permeability test / groundwater / 割れ目の可視化
Research Abstract

It is commonly accepted that fluid flow in granitic rocks mainly occurs through discontinuities such as joints, fractures and cracks. However all of discontinuities are not always the conduits. How do the fluid flow path form? The investigations of fracture system in Stripa mine, Aspo Hard Rock Laboratory and Kamaishi Mine suggest that fluid flow path mainly relates to the displacement along the fractures and in situ stress regime.
The effect of shear deformation on hydraulic properties of Miocene sandstone, Shirahama Ss, was investigated in drained triaxial compression experiments. Flow pump method developed by Olsen et al. (1985) is adopted in order to measure the hydraulic conductivity. The water to permeate was run out to two directions, that is the loading direction and the vertical to loading. These tests show that hydraulic conductivities at the peak stress for both tests increase about three times as large as the initial ones. The difference of hydraulic properties due to flow direction is now in consideration.
In order to examine the deformational and hydraulic properties of rock with fracture system, we developed the triaxial testing machine, in which the surface microstructure of specimen can be observed in a motion using a stereoscopic microscope. In this present study we first showed some experimental results in uniaxial compression test. The shearing process on fractures experimentally generated is simultaneously observed by stereoscopic microscope. The rotation and cutting of bridge, sliding on fracture plane and opening of fracture occur. Furthermore it is clear that these structures are continued inside the specimen by thin section observation. Next, permeability tests under triaxial compression were conducted for fractured Shirahama sandstone. The tests show that the slide along fractures mainly occur after the peak stress and hydraulic conductivity abruptly increase.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 森田豊: "地質構造の把握を基礎とした割れ目系のモデル化と地下水流れの解析" 月刊地球. (掲載予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 長田昌彦: "岩盤割れ目系の形成過程を考慮した浸透特性の評価" 月刊地球. (掲載予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 徳永朋祥: "堆積盆シミュレータを用いた油田形成過程の評価" 月刊地球. (掲載予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 鈴木尊: "変形下における岩石の透水性に関する研究" 土木学会年次講演会. III. 616-617 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 長田昌彦: "顕微鏡下岩石変形実験による微小割れ目のせん断過程の観察" 第46回応用力学連合講演会. 279-280 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 長田昌彦: "三軸圧縮下における岩石の浸透特性に関する研究" 地盤工学会. (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yutaka Morita and Kunio Watanabe: "Modelling of fracture system based on evaluation of geological structure and its application to groundwater flow analysis." Earth Monthly. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiko Osada: "Evaluation of hydraulic properties in rock masses considering the process of fracture system development." Earth Monthly. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tomochika Tokunaga: "Evaluation of the process of oil field formation using three-dimensional basin simulator." Earth Monthly. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takashi Suzuki and Masahiko Osada: "Study on hydraulic properties of rock under deformation." Proc.Of the 50^<th> annual conference of the Japan Society of civil engineers. 616-617 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiko Osada and Hiroyuki Takeishi: "Direct observation of shearing process on experimental fractures in sandstone under stereoscopic microscope." Japan NCTAM. 279-280 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiko Osada, Masayuki Usui and Takashi Suzuki: "Study on hydraulic properties of rock under triaxial compression." The 32th Japan National conference on Soil Mechanics and Foundation Engineering. (in print). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 森田豊: "地質構造の把握を基礎とした割れ目系のモデル化と地下水流れの解析" 月刊地球. (掲載予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 長田昌彦: "岩盤割れ目系の形成過程を考慮した浸透特性の評価" 月刊地球. (掲載予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 徳永朋祥: "堆積盆シミュレータを用いた油田形成過程の評価" 月刊地球. (掲載予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 鈴木尊: "変形下における岩石の透水性に関する研究" 土木学会年次講演会. III. 616-617 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 長田昌彦: "顕微鏡下岩石変形実験による微小割れ目のせん断過程の観察" 第46回応用力学連合講演会. 279-280 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 長田昌彦: "三軸圧縮下における岩石の浸透特性に関する研究" 地盤工学会. (発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Watanabe, K.: "In-site and labolatory tests for estimating the hydrolic properties of unsaturated rock." 8th ISRM Congress. 725-728 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 黒川潮: "原位置蒸発散量測定装置の作製と植虫の蒸発散特性の基礎研究" 応用地質. 36-4. 293-299 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 渡辺邦夫: "地下水研究に関する最近の話題" 土と基礎. 43. 7-11 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 渡辺邦夫: "光と色の環境に関する基礎研究" 第27回岩盤力学に関するシンポジウム. 26-30 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 渡辺邦夫: "神岡岩盤試験場での割れ目系特性調査とクロスホール透水試験へのDon-chemモデルの適用" 第27回岩盤力学に関するシンポジウム. 196-200 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yoshinaka, R.: "The comparison between dynamic and static strength of soft sedimentary works." Rock Foundation. 109-114 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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