Title 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

Published Washington, DC : National Academy Press, 1993

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Description 1 online resource (x, 92 pages) : illustrations Contents 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 Notes "Panel on Borehole Stability"--Page iii Panel chairman: Jean-Claude Roegiers English Print version record Subject Borehole mining. Boring. drilling (process) TECHNOLOGY & ENGINEERING -- Mining. Borehole mining Boring Form Electronic book Author Roegiers, Jean-Claude. National Research Council (U.S.). Panel on Borehole Stability. National Research Council (U.S.). Geotechnical Board. National Research Council (U.S.). Commission on Engineering and Technical Systems. ISBN 0309572258 9780309572255

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