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MINE ENGINEERING ROCK MECHANICS

MINE ENGINEERING ROCK MECHANICS. (…a personal view…) W.G. Pariseau Professor of Mining Engineering Department of Mining Engineering University of Utah, Salt Lake City, UT ARMA WORKSHOP June 26, 2010 Park City, Utah.

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MINE ENGINEERING ROCK MECHANICS

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  1. MINE ENGINEERING ROCK MECHANICS (…a personal view…) W.G. Pariseau Professor of Mining Engineering Department of Mining Engineering University of Utah, Salt Lake City, UT ARMA WORKSHOP June 26, 2010 Park City, Utah

  2. 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

  3. PAST PRACTICAL ACHIEVEMENTS: (laboratory testing, mine measurements, analysis, comparisons, demonstration…) • MINE FILL • IN SITU STRESS MEASUREMENT • STRESS ANALYSIS FOR DESIGN • ROCK SLOPE STABILITY • CABLE BOLTING AND VCR MINING • DRIFT AND FILLCRETE MINING • NUMERICAL METHODS FOR DESIGN

  4. Mine Fill Research: lab testing +mine measurements+ FE modeling SRC, USBM,Coeur d’Alene Mining District

  5. Doorstoppers (4-gauge) Stress Measurement In Situ USBM BDG’s 4-prong, 1-prong Overcoring at the Kelly Block Cave Mine, Anaconda Co., Butte, MT HI Cells

  6. 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).

  7. 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.

  8. Rock Slope Stability – Economics! Rock Slope Engineering, E. Hoek and J. Bray, 1974 (wedge failures, joints, toppling, slip circles, drainage, blasting)

  9. 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)

  10. Rock Slope Stability…2009 Blasting Drainage

  11. CABLE BOLTING & VCR MINING

  12. INSTRUMENTATION and MINE MEASUREMENTS of DISPLACEMENTS R=0.84

  13. DRIFT& FILLCRETE MINING Turquoise Ridge, Nevada, 2002 back fillcrete is holding nicely 75 ft span instrumentation first and second pillar blasts

  14. Numerical Methods for Design, i.e., FEM • Berkeley Pit, 1969

  15. Numerical Methods for Design, i.e., FEM Galena Mine, 1972

  16. 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.

  17. FUTURE NEEDS (afternoon panel presentation) Where do go from here? ARMA WORKSHOP June 26, 2010 Park City, Utah

  18. Thank you!

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