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Structural analysis of a mechanized LHD trench undercut caving system.

Authors
Jude-CV
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9542, 1995 Jan; :1-53
Link
NIOSHTIC No.
20039178
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-stability; Stress-analysis; Structural-failure; Boundary-element-method; Boreholes; Rock-mechanics; Mines-excavations; Shear-stress; Structural-analysis; Mining-engineering
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-216768
NTIS Price
A04
Identifying No.
RI-9542
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9542
State
CO
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