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GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING EMPIRICAL DESIGN METHODS – UBC GEOMECHANICS RESEARCH –CERM3 WORKSHOP R. PAKALNIS - UBC.

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Presentation on theme: "GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING EMPIRICAL DESIGN METHODS – UBC GEOMECHANICS RESEARCH –CERM3 WORKSHOP R. PAKALNIS - UBC."— Presentation transcript:

1 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING EMPIRICAL DESIGN METHODS – UBC GEOMECHANICS RESEARCH –CERM3 WORKSHOP R. PAKALNIS - UBC

2 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING INTRODUCTION ANALYTICAL OBSERVATIONAL EMPIRICAL SAFETY & WORKABLE INTRODUCTION INTRODUCTION QUANTIFY ROCK MASS QUANTIFY ROCK MASS RELATE TO PAST PRACTICE RELATE TO PAST PRACTICE PREDICTION PREDICTION

3 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING STOPE DESIGN PILLAR DESIGN SPAN DESIGN SUPPORT 1998

4 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING

5 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING STRESS INDUCED LOAD INPUT PARAMETERS GUESTIMATE

6 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING STRUCTURE GEOMETRY SHEAR STRENGTH SUPPORT

7 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING ROCK MASS CLASSIFICATION RMR (1976) Q - SYSTEM (1974)

8 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING OPENING DESIGN STABILITY GRAPH (ELOS) CRITICAL SPAN CURVE

9 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING ELOS – EQUIVALENT LINEAR OVERBREAK SLOUGH

10 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING PARALLEL STRUCTURE B = 0.2, 0.3 RELAXED HW A = 1 WALL DIP C = ( 8 - 6 * COS f )

11 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING MODIFIED STABILITY GRAPH – RADIUS FACTOR

12 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING RADIUS FACTOR = 1.1 X HYDRAULIC RADIUS

13 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING OPENING DESIGN STABILITY GRAPH (ELOS) CRITICAL SPAN CURVE

14 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING SPAN DESIGN CURVE

15 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING WEAK ROCK MASS SEISMICITY EXTENT OF FAILURE (5.5 2.5 2.5 5.5) 6ft 10ft 3ft x 3ft BOLT SPACING (0.5*10ft*5ft*3ft)/11ft 3 /ton= 7ton 5ft

16 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING

17 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING PREDICTIVE TOOL SPAN ESTIMATION 292 CASE HISTORIES (160 STABLE, 59 POT, 73 UNSTABLE) 18 X 18 GRID - NEURAL OUTPUT (324 pts) 3 1 3

18 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING PREDICTIVE TOOL SPAN ESTIMATION NEURAL NET RESULTS IN CONTOUR PLOT OF 1=.100% STABLE TO 3=100% UNSTABLE TRAINING ERROR = 12%

19 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING PILLAR DESIGN PILLAR LOAD/UCS PILLAR WIDTH/HEIGHT

20 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING

21 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING PILLAR STABILITY GRAPH

22 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING Wp/Hp < 1 SEISMICITY PILLAR STABILITY GRAPH

23 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING 1700m below surface 47g/tonne GOLD 600 TPD GOLDCORP RED LAKE MINE

24 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING STABLEUNSTABLEFAILED LOW BURST POTENTIALMEDIUM BURST POTENTIALHIGH BURST POTENTIAL Pillar Stability Graph FS>1.4 on Pillar Stability Graph 1.0 < FS < 1.4 FS<1.0 Induced Stress Criteria s 1/UCS< 0.5 0.5 < s 1/UCS< 0.6 s 1/UCS > 0.6 Pillar Geometry Wp/Hp > 32< <3 Wp/Hp < 2 Observations Minor ground working, minor spallingGround working, pillar spallingSubstantial bursting * * in process of being evaluated - microseismic BURST PRONE CRITERIA

25 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING STUDY AT QUINSAM MINE – BRITISH COLUMBIA - CANADA

26 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING SURFACE SUBSIDENCE OVER SHALLOW EXCAVATIONS

27 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING ANGLE OF CRITICAL DEFORMATION IS <10 o FROM VERTICAL STRUCTURAL CONTROL DEPTH OF CAVE AS MUCH AS 14X EXCAVATION HEIGHT

28 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING CONCLUSIONS CALIBRATION TO ANALYTICAL AND EMPIRICAL APPROACHES MODIFIED ACCORDING TO MINE BEHAVIOUR SAFETY & WORKABLE INTERPOLATE, NOT EXTRAPOLATE KNOW THY DATABASE TOOL

29 GEOMECHANICS DESIGN GROUP UBC MINING & MINERAL PROCESS ENGINEERING ACKNOWLEDGEMENT NIOSH CERM3


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