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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

past achievements that i have seen since 1960 s where we are and how we got here

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
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
slide4

Mine Fill Research: lab testing

+mine measurements+ FE modeling

SRC, USBM,Coeur d’Alene Mining District

slide5

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

stress analysis for design the early years for example
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).
slide7

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 Stability – Economics!

Rock Slope Engineering, E. Hoek and J. Bray, 1974

(wedge failures, joints, toppling, slip circles, drainage, blasting)

rock slope stability economics1
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)

slide12

INSTRUMENTATION and MINE

MEASUREMENTS of

DISPLACEMENTS

R=0.84

drift fillcrete mining
DRIFT& FILLCRETE MINING

Turquoise Ridge, Nevada, 2002

back fillcrete is holding nicely

75 ft span

instrumentation

first and second pillar blasts

numerical methods
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

FUTURE NEEDS

(afternoon panel presentation)

Where do go from here?

ARMA WORKSHOP

June 26, 2010

Park City, Utah