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Determination of Near Field Excavation Disturbance in Crystalline Rock

Published online by Cambridge University Press:  28 February 2011

Robert Koopmans  and
Robin W. Hughes
Robert Koopmans
Affiliation:
Ontario Hydro, 800 Kipling Avenue, Toronto, Ontario, Canada, M8Z 5S4
Robin W. Hughes
Affiliation:
Ontario Hydro, 800 Kipling Avenue, Toronto, Ontario, Canada, M8Z 5S4
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Extract

A procedure has been established to assess the effectiveness of various excavation techniques using a computerized borehole dilatometer system developed by the authors[l]. This system, which incorporates data acquisition and computer capabilities, allows data to be collected and analyzed quickly in the field. The zone of disturbance is determined by conducting borehole tests at relatively close intervals and profiling the results with depth from the excavation wall. A similar concept of using deformation moduli measurements from plate bearing tests to detect changes in bedrock conditions is discussed by Koopmans[2]. In general, lower moduli are obtained in disturbed zones which have become stress relieved due to rock relaxation and/or the presence of rock discontinuities while higher values are obtained in relatively undisturbed zones which have not become stress relieved due to an absence of rock relaxation and/or rock discontinuities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 567
Copyright
Copyright © Materials Research Society 1985

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References

1. Koopmans, R. and Hughes, R.W. (1984). An Automated and Computerized Dilatometer System to Measure Deformation Modulus of Rock, Western States Mining Expo-84, Reno, Nevada.Google Scholar
2. Koopmans, R. (1983). Bedrock Degradation as Determined from Plate Bearing Tests, International Symposium on Soil and Rock Investigations by In-Situ Testing, Paris, vol 2, pp 77–81.Google Scholar
3. Hustrulid, W. and Hustrulid, A. (1975). The CSM Cell-A Borehole Device for Determining the Modulus of Ridigity of Rock, 15th Symposium on Rock Mechanics, South Dakota.Google Scholar
4. Jakubick, A.T. (1984). Personal Communication.Google Scholar
5. Wong, J., Hurley, P.A. and West, G.F. (1984). Small Scale Cross-Borehole Seismology for Mapping of Dynamic Elastic Moduli and Detection of Cracks Within Rock Masses, prepared for Atomic Energy of Canada.Google Scholar
6. Koopmans, R. (1982). Near Surface In-Situ Stress Measurements - Lac du Bonnet Batholith, Manitoba, Ontario Hydro Research Report No 82-73-H.Google Scholar
7. McKay, D.A. (1982). Lac du Bonnet Geomechanical Test Results, Ontario Hydro Research Report No 82-441-K.Google Scholar