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Structural Analysis of a Mechanized LHD Trench Undercut Caving System.


PB95216768

Publication Date 1995
Personal Author Jude, C. V.
Page Count 51
Abstract This U.S. Bureau of Mines (USBM) report presents results of stress analyses and field observations to investigate the effects of elevated trench drifts on the structural stability of rock mass zones surrounding a production draw drift in a mine utilizing a mechanized load-haul-dump (LHD) trench undercut panel caving system. A two-dimensional boundary-element mine stress model was developed to predict the locations and extent of damaged rock mass zones surrounding draw drifts where adjacent, parallel trench drifts are either elevated or not elevated above the LHD production draw drift level. A Mohr-Coulomb shear-failure criterion was obtained directly from in situ borehole shear test data. Hoek-Brown Shear-failure parameter values were computed from borehole-shear and triaxial test data. A procedure is described to estimate these parameters when a rock mass rating (RMR) value and triaxial data on intact samples exist, and no borehole shear test data exist. Results indicate that trench drifts, elevated to the level equal to the height of the LHD production draw drift, would not minimize material damage nor significantly enhance the stability of rib and crown pillar zones surrounding production draw drifts in the mechanized LHD trench undercut caving panel investigated at this mine.
Keywords
  • Structural analysis
  • Mining engineering
  • Structural stability
  • Stress analysis
  • Structural failure
  • Boundary element method
  • Boreholes
  • Rock mechanics
  • Mines(Excavations)
  • Shear stress
  • Load-haul-dump trench undercut panel caving system
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
Corporate Authors Bureau of Mines, Denver, CO. Denver Research Center.
Document Type Technical Report
Title Note Rept. of investigations/1995.
NTIS Issue Number 199516
Structural Analysis of a Mechanized LHD Trench Undercut Caving System.
Structural Analysis of a Mechanized LHD Trench Undercut Caving System.
PB95216768

  • Structural analysis
  • Mining engineering
  • Structural stability
  • Stress analysis
  • Structural failure
  • Boundary element method
  • Boreholes
  • Rock mechanics
  • Mines(Excavations)
  • Shear stress
  • Load-haul-dump trench undercut panel caving system
  • Bureau of Mines
  • 48A - Mineral Industries
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