Laboratory verification of a new dilatrneter tool for stress measurement

T. Ito, K. Hayashi, A. Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to detect reopening of hydraulically induced axial cracks emanating from borehole, we developed a new dilatometer tool and proved it in the laboratory. The tool consists essentially of a packer around which deformation transducers sensitive to tangential strain are affixed. The packer is inflated to touch the borehole wall, and then pressure is increased step-wise and the resultant strains recorded. Initially, the circumferential strain developed around the borehole is radially symmetric. However, this becomes strongly asymmetric orice the cracks begin to open. Thus, the records of strain at different locations around the borehole indicate clearly the packer pressure at which the cracks begin to open. If the borehole is vertical, the detected pressure at crack opening allows us to estimate the maximum horizontal stress on condition that the minimum horizontal stress is estimated from the crack closure pressure observed in hydrofracturing test.

Original languageEnglish
Title of host publication4th North American Rock Mechanics Symposium, NARMS 2000
PublisherAmerican Rock Mechanics Association (ARMA)
Pages881-884
Number of pages4
ISBN (Print)9058091554, 9789058091550
Publication statusPublished - 2000
Event4th North American Rock Mechanics Symposium, NARMS 2000 - Seattle, United States
Duration: 2000 Jul 312000 Aug 3

Publication series

Name4th North American Rock Mechanics Symposium, NARMS 2000

Other

Other4th North American Rock Mechanics Symposium, NARMS 2000
CountryUnited States
CitySeattle
Period00/7/3100/8/3

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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