MINE ENGINEERING ROCK MECHANICS - Slope Engineering, E. Hoek and J. Bray, 1974 (wedge failures,...

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Transcript of MINE ENGINEERING ROCK MECHANICS - Slope Engineering, E. Hoek and J. Bray, 1974 (wedge failures,...

  • 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

  • PAST ACHIEVEMENTS

    (that I have seen since 1960s)

    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 dAlene Mining District

  • Stress Measurement In Situ

    Overcoring at the Kelly Block Cave Mine, Anaconda Co., Butte, MT

    HI Cells

    USBM BDGs

    4-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 Stability2009

    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 nicely

    Turquoise Ridge, Nevada, 2002

  • Numerical Methods for Design, i.e., FEM

    Berkeley Pit, 1969

  • Numerical Methods for Design, i.e., FEM

    Galena 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!