MINE ENGINEERING ROCK MECHANICS
(…a personal view…)
W.G. Pariseau
Professor of Mining EngineeringDepartment of Mining Engineering
University of Utah, Salt Lake City, UT
ARMA WORKSHOPJune 26, 2010Park City, Utah
PAST ACHIEVEMENTS(that I have seen since 1960’s)
Where we are and how we got here…
Morning Panel Presentation
ARMA WORKSHOP
June 26, 2010
Park City, Utah
PAST PRACTICAL ACHIEVEMENTS: (laboratory testing, mine measurements, analysis, comparisons, demonstration…)
1. MINE FILL
2. IN SITU STRESS MEASUREMENT
3. STRESS ANALYSIS FOR DESIGN
4. ROCK SLOPE STABILITY
5. CABLE BOLTING AND VCR MINING
6. DRIFT AND FILLCRETE MINING
7. NUMERICAL METHODS FOR DESIGN
Mine Fill Research: lab testing +mine measurements+ FE modeling
SRC, USBM,Coeur d’Alene Mining District
Stress Measurement In Situ
Overcoring at the Kelly Block Cave Mine,Anaconda Co., Butte, MT
HI Cells
USBM BDG’s4-prong, 1-prong
Doorstoppers(4-gauge)
Stress Analysis for Design(the early years, for example)
• La Mecanique des Roches, J. Talobre, 1957
• Rock Mechanics and the Design of Structures in Rock, L. Obert and W. I. Duvall (1967).
• Elasticity, Fracture and Flow, J. C. Jaeger, 1969
• Rock Mechanics Principles, D.F. Coates (1970).
Mainly, stress concentration about holes of simple shape, using
results from elasticity theory, e.g., the problem of a circular hole in
plane strain or plane stress (Kirsch equations), other shapes using
complex variable theory – applied mathematics, pre-computer era.
Rock Slope Stability – Economics!
Rock Slope Engineering, E. Hoek and J. Bray, 1974
(wedge failures, joints, toppling, slip circles, drainage, blasting)
Rock Slope Stability – Economics! Guidelines for Open Pit Slope Design,
J. Read and P. Stacey (eds) 2009. (wedge failures, joints, toppling, slip circles, drainage, blasting, risk analysis)
Rock Slope Stability…2009
Blasting
Drainage
CABLE BOLTING & VCR MINING
INSTRUMENTATION and MINE MEASUREMENTS of DISPLACEMENTS
R=0.84
DRIFT& FILLCRETE MINING
75 ft span
instrumentation first and second pillar blasts
back fillcrete is holding nicelyTurquoise Ridge, Nevada, 2002
Numerical Methods for Design, i.e., FEM• Berkeley Pit, 1969
Numerical Methods for Design, i.e., FEMGalena Mine, 1972
Numerical Methods…• Continuum codes: FEM, BEM, FDM,
• Rock Block codes: DEM, NMM, DDA
(physical laws, kinematics, material laws)- equilibrium (static, dynamic) equations
- strain displacement equations- stress strain equations
NOTE: Continuum codes accommodate discontinuities and Rock Block codes
accommodate deformable blocks.
FUTURE NEEDS
(afternoon panel presentation)
Where do go from here?
ARMA WORKSHOP
June 26, 2010
Park City, Utah
Thank you!