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Evaluation of water content in rock mass by electromagnetic and resistivity tomography. Denjiha, hiteiko tomography ni yoru ganban no gansui jotai hyoka

Journal Article:

Abstract

As a method to evaluate the rock mass, electromagnetic tomography and resistivity tomography were tested on the original site. The electromagnetic tomography can tomographically analyze the propagation velocity and initial amplitude damping. The resistivity tomography uses a finite element method from the initial resistivity distribution model and finally gives a model which is nearly equal to the actual resistivity distribution. Both the above tomographic analyses can detect the crushed spot as a low velocity, high damping and low resistivity spot. However, the electromagnetic tomography could detect finer structure than the resistivity tomography. The water content of rock mass was evaluated from the damping coefficient which was given by the amplitude damping tomography of electromagnetic wave. If it is compared with the water content which is given by the dielectric constant of velocity tomography, there partially exists discrepancy between both, because the damping coefficient contains information on cracks which disperse and reflect the electromagnetic wave. Between the resistivity and porosity, there exists a known experimental formula, which was satisfied by the presently given resistivity. 9 refs., 10 figs.
Authors:
Inaba, T; Inoue, M; Matsumoto, K [1] 
  1. Kajima Corp., Tokyo (Japan)
Publication Date:
Oct 31, 1993
Product Type:
Journal Article
Reference Number:
NEDO-93-921368; EDB-94-146120
Resource Relation:
Journal Name: Kajima Gijutsu Kenkyusho Nenpo (Annual Report, Kajima Technical Research Institute); (Japan); Journal Volume: 41
Subject:
42 ENGINEERING; MOISTURE; GEOPHYSICAL SURVEYS; ROCK BEDS; TOMOGRAPHY; ELECTRIC CONDUCTIVITY; ELECTROMAGNETIC RADIATION; AMPLITUDES; CLEARANCE; CRACKS; DAMPING; DIELECTRIC PROPERTIES; FINITE ELEMENT METHOD; MICROSTRUCTURE; REFLECTION; SCATTERING; VELOCITY; WAVE PROPAGATION; CALCULATION METHODS; DIAGNOSTIC TECHNIQUES; ELECTRICAL PROPERTIES; NUMERICAL SOLUTION; PHYSICAL PROPERTIES; RADIATIONS; SURVEYS; 422000* - Engineering- Mining & Underground Engineering- (1980-)
OSTI ID:
6968676
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: ISSN 0918-015X; CODEN: KGKNE9
Submitting Site:
NEDO
Size:
Pages: 239-244
Announcement Date:

Journal Article:

Citation Formats

Inaba, T, Inoue, M, and Matsumoto, K. Evaluation of water content in rock mass by electromagnetic and resistivity tomography. Denjiha, hiteiko tomography ni yoru ganban no gansui jotai hyoka. Japan: N. p., 1993. Web.
Inaba, T, Inoue, M, & Matsumoto, K. Evaluation of water content in rock mass by electromagnetic and resistivity tomography. Denjiha, hiteiko tomography ni yoru ganban no gansui jotai hyoka. Japan.
Inaba, T, Inoue, M, and Matsumoto, K. 1993. "Evaluation of water content in rock mass by electromagnetic and resistivity tomography. Denjiha, hiteiko tomography ni yoru ganban no gansui jotai hyoka." Japan.
@misc{etde_6968676,
title = {Evaluation of water content in rock mass by electromagnetic and resistivity tomography. Denjiha, hiteiko tomography ni yoru ganban no gansui jotai hyoka}
author = {Inaba, T, Inoue, M, and Matsumoto, K}
abstractNote = {As a method to evaluate the rock mass, electromagnetic tomography and resistivity tomography were tested on the original site. The electromagnetic tomography can tomographically analyze the propagation velocity and initial amplitude damping. The resistivity tomography uses a finite element method from the initial resistivity distribution model and finally gives a model which is nearly equal to the actual resistivity distribution. Both the above tomographic analyses can detect the crushed spot as a low velocity, high damping and low resistivity spot. However, the electromagnetic tomography could detect finer structure than the resistivity tomography. The water content of rock mass was evaluated from the damping coefficient which was given by the amplitude damping tomography of electromagnetic wave. If it is compared with the water content which is given by the dielectric constant of velocity tomography, there partially exists discrepancy between both, because the damping coefficient contains information on cracks which disperse and reflect the electromagnetic wave. Between the resistivity and porosity, there exists a known experimental formula, which was satisfied by the presently given resistivity. 9 refs., 10 figs.}
journal = {Kajima Gijutsu Kenkyusho Nenpo (Annual Report, Kajima Technical Research Institute); (Japan)}
volume = {41}
journal type = {AC}
place = {Japan}
year = {1993}
month = {Oct}
}