Effective conditions to detect crack wave radiating from a fluid-filled crack in a finite test piece of rock

Shin Ito, Kotaro Sekine, Hirokazu Moriya, Kazuo Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

It is examined by numerical calculation how to detect crack wave radiating from a fluid-filled crack in a finite test piece of the rock, emphasizing the application to geometrical characterization of a geothermal reservoir crack. Boundary Integral Equation Method is employed for the numerical calculation. It is revealed that resonance of the test piece and stimulation e.g., hitting by hammer to stimulate the crack, have strong effect on radiation pattern from a crack in a finite test piece. In the case of large stiffness due to contact between the asperities on the upper and lower surfaces of the crack, it is difficult to detect the crack wave. In the case of measuring crack wave on the surface of the test piece, it is better for measuring that the surface of the test piece is near the crack surface. If surface of test piece is not near the crack surface, higher modes of crack wave are veiled in resonance of the test piece and stimulation.

Original languageEnglish
Pages (from-to)158-163
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number762
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • Boundary element method
  • Coupled problem
  • Elastic wave
  • Elasticity
  • Geothermal energy
  • Geothermal reservoir crack

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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