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A study on piezoelectric effect of Rock

Research Project

Project/Area Number 09450383
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionThe University of Tokyo

Principal Investigator

OKUBO Seisuke  The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (90092155)

Co-Investigator(Kenkyū-buntansha) AKIYAMA Masao  The University of Tokyo, Graduate School of Engineering, Assistant, 大学院・工学系研究科, 助手 (00011172)
FUKUI Katsunori  The University of Tokyo, Graduate School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (70251361)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥5,600,000 (Direct Cost: ¥5,600,000)
KeywordsRock / Impact / piezoelectricity / electromagnetic wave / exploration / slope stability / prediction / 破壊 / 地震 / 地電流 / 電位差 / 圧電気 / 圧電現象
Research Abstract

Electromagnetic (EM) signal emitted from compressed and/or fractured rocks has been studied for many years. Some kinds of rocks contain many piezoelectric materials, for example, quartz. Therefore some researchers consider the piezoelectric effect as the dominant cause of the EM signals.
An experiment was carried out in which EM signal was emitted from a block of granite which contains a lot of quartz. The block of granite was manually impacted with a hammer ; a shockless hammer or a standard steel hammer. As a result of the experiment, it was found that EM signal was emitted on hammering. The first phase of the. observed EM signal was similar to strain measured by strain gauge affixed on the steel hammer. EM signal was also observed simultaneously by the electric robes on the surface of the block. Each electric robe was located at position separated by a distance from the hammered point. No time lag or delay was observed in this case. The primary/peak value of the observed voltage was inversely proportional to the distance from the hammered point. The same results were observed in all directions through the experiments. The later part of the EM signal was similar to the elastic wave observed with an acoustic emission (AE) sensor. The elastic wave signal observed with the AE sensor was delayed in proportion to the distance from the hammered point. It can be concluded that the EM signal is relatively large and potentially used for civil or mining purposes.

Report

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

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 前野 沢郎: "一軸圧縮荷重下での岩石の圧電性" 資源・素材学会 平成9年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 159- (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 寺嶋 卓文: "衝撃荷重下での岩石の圧電性" 資源・素材学会 平成10年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 164- (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] MAENO,T.: "Piezoelectricity of Rock in Uniaxial Compression" Proc.Fall Meet.MMIJ, (A). 159 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] TERASHIMA,T.: "A Study on Piezoelectric Effect of Rock." Proc.Fall Meet.MMIJ, (A). 164 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 前野 沢郎: "一軸圧縮荷重下での岩石の圧電性" 資源・素材学会 平成9年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 159 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 寺嶋 卓文: "衝撃荷重下での岩石の圧電性" 資源・素材学会 平成10年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 164 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 前野 沢郎: "一軸圧縮荷重下での岩石の圧電性" 資源・素材学会 平成9年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 159 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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