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ROCK MASS QUALITY EVALUATION IN BAKHTIARY DAM SITE USING SEISMIC METHODS

H. Ramazi, M. Hossaini

First published: 2006DOI pendingView metrics

Abstract

This paper present a geophysical investigation performed for the Bakhtiary dam site in Iran. As it has been designed with 330 meter high, this dam would be the highest dam in the world. In the context of engineering seismology, seismic tomography may be relevant in problems where seismic refraction is currently used. Both of these techniques aim to detect subsurface velocity. In Bakhtiary dam site we used seismic refraction, tomography and borehole seismic tomography methods. For refraction seismic method Geotomo software that employed the time-depth and seismic velocity analysis function of the generalized reciprocal method (GRM) was used. Six exploration Gallery and two boreholes are drilled in Bakhtiary dam that GR1, GR2, GR3 are in right abutment and GL1, GL2, and GL3 are in left abutment. Cross-hole, cross-galleries and also between main and inlet of galleries seismic tomography were designed and surveyed. We used Geotomo software that employed the LSQR method for inversion problems which is commonly used in travel time tomography. Velocity images in GR2 and section of GR2-GR3 show very low velocity. The result of velocity images obtained by the borehole tomography is compared with geology surveying and rock mechanic experiments. It is found that velocity images are in a good agreement with rock mechanics data and geology surveying.

Publication details

Title
ROCK MASS QUALITY EVALUATION IN BAKHTIARY DAM SITE USING SEISMIC METHODS
Authors
H. Ramazi, M. Hossaini
Proceedings
6th International Scientific Conference - SGEM
Publisher
SGEM Scientific GeoConference
Year
2006
Pages
141-152
SWS Citekey
Ramazi2006141152
ISSN
1314-2704
ISBN
954-918181-2
Language
en
Publication type
Conference Paper
Keywords
Bakhtiary damP-wave velocityRefraction seismicRock mass qualitySeismic tomography
References7

  1. Mahab Ghodss Consulting Engineers, 2002, Engineering “Geology for Reservoir Dam and Power Plant of Bakhtiary” Technical report, (in Persian).

  2. Hayashi, k. and Takashi, T., 2001. “High Resolution Seismic Refraction Method Using Surface and Borehole Data for Site Characterization of Rock”, Internationa Journal of Rock mechanics & Mining, Science, Vol: 38, pp: 807 - 813.

  3. Palmer, Derecke 2001. “ Measurement of Rock Fabric in Shallow Refraction Seismology”. Exploration Geophiosics, Vol: 32, pp: 307 –314

  4. Griffin, R.H 1978. “Geophisical Exploration for Engineering and Environmental Investigations” Department of the Army U.S.Army Crops Engineers Washington, p.76.

  5. Steward, R.R., 1992. “Exploration Seismic Tomography: Fundamentals”, S.N.

  6. Domenico, Series Editor, Cource Notes Series, Vol.3.

  7. Sabir Co., 2006. “Results of flat Jacking in Dam and Power Plant of Bakhtiary”, Technical Report, (in Persian) 6th International Multidisciplinary Scientific GeoConference SGEM2006 www.sgem.org

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