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PB93132850

Publication Date	1992
Personal Author	Pariseau, W. G.; Whyatt, J. K.; McMahon, T. J.
Page Count	22
Abstract	The U.S. Bureau of Mines has been conducting a series of rock mechanics investigations at the Lucky Friday Mine in the Coeur d'Alene Mining District of northern Idaho. The present study uses rock deformation measurements to validate and calibrate a geomechanical model of the experimental Lucky Friday underhand longwall (LFUL) stope on the 5100 level of the Lucky Friday Mine, Mullan, ID. The calibrated three-dimensional, finite-element model and measurements of rock mass displacement show a correlation of 0.795. The calibration reduces rock mass modulus to 14 to 17 pct of laboratory values and rock mass strength (with an energy rule) to 37 to 41 pct of laboratory values. The model suggested that stress-related ground control problems would be encountered west of the stope where the vein makes a right-angle turn and then splits.
Keywords	Coal mining Rock mechanics Stope mining Investigations Calibrating Mathematical models Measurement Strength Finite difference theory Displacement Mechanical properties Mine bursts Stresses Depth Lucky Friday Mine Mullan(Idaho) Rock mass
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 50D - Soil & Rock Mechanics
Corporate Authors	Bureau of Mines, Spokane, WA. Spokane Research Center.
Supplemental Notes	See also Part 2, PB93-132843.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199306

Rock Mechanics Investigations at the Lucky Friday Mine. Part 3. Calibration and Validation of a Stope-Scale Finite-Element Model.

Rock Mechanics Investigations at the Lucky Friday Mine. Part 3. Calibration and Validation of a Stope-Scale Finite-Element Model.
PB93132850

Publication Date	1992
Personal Author	Pariseau, W. G.; Whyatt, J. K.; McMahon, T. J.
Page Count	22
Abstract	The U.S. Bureau of Mines has been conducting a series of rock mechanics investigations at the Lucky Friday Mine in the Coeur d'Alene Mining District of northern Idaho. The present study uses rock deformation measurements to validate and calibrate a geomechanical model of the experimental Lucky Friday underhand longwall (LFUL) stope on the 5100 level of the Lucky Friday Mine, Mullan, ID. The calibrated three-dimensional, finite-element model and measurements of rock mass displacement show a correlation of 0.795. The calibration reduces rock mass modulus to 14 to 17 pct of laboratory values and rock mass strength (with an energy rule) to 37 to 41 pct of laboratory values. The model suggested that stress-related ground control problems would be encountered west of the stope where the vein makes a right-angle turn and then splits.
Keywords	Coal mining Rock mechanics Stope mining Investigations Calibrating Mathematical models Measurement Strength Finite difference theory Displacement Mechanical properties Mine bursts Stresses Depth Lucky Friday Mine Mullan(Idaho) Rock mass
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 50D - Soil & Rock Mechanics
Corporate Authors	Bureau of Mines, Spokane, WA. Spokane Research Center.
Supplemental Notes	See also Part 2, PB93-132843.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199306