Stability, failure, and measurements of boreholes and other circular openings / U.S. National Committee for Rock Mechanics, Geotechnical Board, Commission on Engineering and Technical Systems, National Research Council.
Material type:
TextPublication details: Washington, DC : National Academy Press, 1993.Description: 1 online resource (x, 92 pages) : illustrationsContent type: - text
- computer
- online resource
- 0309572258
- 9780309572255
- 622.24 22
- TN281 .U5 1993eb
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OPJGU Sonepat- Campus | E-Books EBSCO | Available |
"Panel on Borehole Stability"--Page iii.
Panel chairman: Jean-Claude Roegiers.
Print version record.
Stability, Failure, and Measurements of Boreholes and Other Circular Openings -- Copyright -- Contents -- EXECUTIVE SUMMARY -- INTRODUCTION -- FAILURE -- ABNORMAL STABILITY -- 1 EXCAVATION, MAINTENANCE, AND PERFORMANCE -- BEFORE THE EXCAVATION -- DURING EXCAVATION -- UNSUPPORTED OPENINGS -- CHANGE IN STRESSES -- CHANGE IN STRENGTH -- DECREASE IN SUPPORT CAPACITY -- SUPPORTED OPENINGS -- HOLE COLLAPSE -- INSUFFICIENT BONDING -- FORMATION DAMAGE -- LONG-TERM STABILITY -- 2 OBSERVATIONAL EVIDENCE -- FIELD OBSERVATIONS -- LABORATORY OBSERVATIONS
3 stability assessmentclosure measurements -- geophysical measurements -- in-situ stress conditions -- civil and mining engineering -- 4 rock-mass assessment -- scale of investigation and resolution -- mechanical properties and the stability of the openings -- primary factors affecting the remote assessment of rock-mass properties -- high-resolution surface sounding -- seismic methods -- electrical resistivity sounding -- radar sounding and radar tomography -- rock-mass exploration by means of pilot boreholes -- measurement-while-drilling (mwd)
5 analytical and numerical modelingunsupported openings -- elastic analysis -- inelastic analysis -- simplified bifurcation analysis -- isotropic far-field stresses -- numerical analysis of localization phenomena in deep boreholes -- nonlinear effects -- time-dependent effects -- scale effects -- supported openings -- elastic analysis -- nonlinear or time-dependent analysis -- intersections -- slabbing and exfoliation -- influence of preexisting discontinuities or structure -- discrete element method -- block theory
Discontinuous deformation analysis6 conclusions -- references
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