Stability, failure, and measurements of boreholes and other circular openings /

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autores Corporativos: U.S. National Committee for Rock Mechanics, 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
Otros Autores: Roegiers, Jean-Claude
Formato: Electrónico eBook
Idioma:Inglés
Publicado: Washington, DC : National Academy Press, 1993.
Temas:
Borehole mining.
Boring.
Sondages (Mines)
Forage.
drilling (process)
TECHNOLOGY & ENGINEERING > Mining.
Borehole mining
Boring
Acceso en línea:Texto completo
Tabla de Contenidos:
  • 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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