William G. Pariseau “Design Analysis in Rock Mechanics"

William G. Pariseau “Design Analysis in Rock Mechanics"
Taylor & Francis | 2006-10-20 | ISBN: 041540357X | 560 pages | PDF | 6,4 MB

 Supplying numerous example problems illustrating design analysis techniques, this text approaches important design issues in rock mechanics from a mechanics of materials foundation. It addresses rock slope stability in surface excavations, shaft and tunnel stability, and entries and pillars. The book also covers three-dimensional caverns with an emphasis of backfill and cable bolting and addresses the geometry and forces of chimney caving. Appendices contain supplementary information about rock, joint, and composite properties, rock mass classification schemes, and useful formulas. A solutions manual is available for the many problems posed at the end of each chapter.

Content
Preface xi
Acknowledgments xv
1 Introduction  (1.06 Mb)
1.1 A practical design objective 3
1.2 Problem solving 4
1.3 Units 5
1.4 Background information 6

• Rock mechanics literature 6
• Mechanical properties of rock 7

1.5 Problems 7

• Basics 7
• Review of stress 8
• Review of strain and elasticity 10

2 Slope stability  (0.5 Mb)
2.1 Translational rock slope failures 18

• Planar block slides 18
• Saftey factor improvement 31
• Wedge failures 38

2.2 Rotational slope failures 60

• Remedial measures 68
• Base failures 70
• Toppling failures 72

2.3 Problems 73

• Planar block slides 73
• Wedge failures 78
• Rotational slides 81
• Dynamics, toppling 85

3 Shafts  (1.9 Mb)
3.1 Single unlined naturally supported shafts 87

• Shaft wall stress concentration 88
• Unlined circular shafts 89
• Unlined elliptical shafts 94
• Unlined rectangular shafts 101
• Shaft wall strengths 113

3.2 Shaft wall support and liners 121

• Shaft wall bolting 122
• Circular shaft liners 130
• Circular steel rings 140

3.3 Multiple naturally supported shafts 142

• Circular shafts in a row 142
• Shaft pillar safety 148
• Two circular shafts of different diameter 153
• Elliptical shafts in a row 155
• Rectangular shafts in a row 158

3.4 Problems 162

• Single, naturally supported shafts 162
• Supported shafts, liners, bolts, rings 169
• Multiple shafts 173

4 Tunnels  (0.5 Mb)
4.1 Naturally supported tunnels 175

• Single tunnels 177
• Single tunnel joints 184
• Multiple tunnels 189

4.2 Tunnel support 194

• Fixed steel sets 194
• Pattern bolting – rock reinforcement 208
• Combination support 212
• Yieldable steel arches 218
• Light segment liner 219

4.3 Problems 220

• Naturally supported tunnels 220
• Supported tunnels 221
• Rock mass classification schemes, RQD 226

5 Entries in stratified ground  (0.5 Mb)
5.1 Review of beam analysis 229

• Basic beam formulas 230
• Important special cases 234

5.2 Softrock entries 243

• Naturally supported roof 243
• Bolted roof 255
• Point anchored roof bolting 255
• Distributed anchorage roof bolting 261
• Roof trusses 264

5.3 Problems 266

• Naturally supported roof 266
• Bolted roof 268

6 Pillars in stratified ground  (0.5 Mb)
6.1 Pillars in a single seam 277

• Tributary area, extraction ratio analysis 277
• Size effect on strength 281

6.2 Pillars in dipping strata 289

• Extraction ratio formulas for pillars in dipping seams 289
• An unconventional Mohr’s circle representation 293
• Generalized Mohr’s circle 298
• Backfill effects on pillar safety factors 300

6.3 Pillars with joints 306

• Flat seam pillars with joints 306
• Dipping seam pillars with joints 310

6.4 Pillars in several seams 315

• Columnized main entry pillars 315
• Staggered chain entry pillars 321

6.5 Barrier pillars 324
6.6 Problems 329

7 Three-dimensional excavations  (0.7 Mb)
7.1 Naturally supported caverns and stopes 346

• Spheroidal excavations 347
• Cubical and brick-shaped excavations 356

7.2 Joints in cavern and stope walls 363
7.3 Tabular excavations 364 7.4 Cavern and stope support 366

• Hardrock mine fill 367
• Cable bolt support 386

7.5 Problems 390

• 3D Caverns 390
• Back fill 391
• Cable bolting 393

8 Subsidence  (1.7 Mb)
8.1 Chimneys 397

• Chimney cave geometry 398
• Caving rock flow 405
• Chimney cave forces 407
• Chimney cave water forces 417
• Support near caving ground 421

8.2 Troughs 430

• Limit of subsidence 431
• Maximum subsidence 433
• Critical width 433
• NCB subsidence profile 435
• Angle of draw and subsidence factor adjustments 440
• NCB strain profile 444
• Surface damage 451
• Multipanel, multiseam subsidence 455
• Alternative approaches to subsidence 461

8.3 Problems 461

• Chimney caving 461
• Combination support 464
• Subsidence troughs 467

Appendix A: Background literature 469
A.1 Books about fundamentals of mechanics 469
A.2 Books about rock mechanics 470
A.3 Books containing rock properties 471
A.4 General sources of rock mechanics information 472

Appendix B: Mechanical properties of intact rock and joints 473
B.1 Elastic moduli of intact rock 474

• Young’s modulus 474
• Poisson’s ratio 477
• Shear modulus 479
• Anisotropy 480

B.2 Strength of intact rock 482

• Tensile strength 482
• Unconfined compressive strength 485
• Compressive strength under confining pressure 495
• Mohr–Coulomb strength 497
• Hoek–Brown strength 499
• Drucker–Prager strength 499
• Nonlinear n-type strength 501
• Compressive strength test data 501

B.3 Joint stiffness 507

• Normal stiffness 508
• Shear stiffness 509

B.4 Joint strength 509
B.5 Simple combinations of intact rock and joints 512

• Continuously jointed rock mass moduli 514
• Discontinuously jointed rock mass moduli 518
• Continuously jointed rock mass strengths 520
• Discontinuously jointed rock mass strengths 523

Appendix C: Rock mass classification schemes for engineering 529
C.1 Rock quality designation 529
C.2 Terzaghi modified scheme 529
C.3 RSR, RMR, and Q 530
C.4 Comparisons of Hp estimates 531

Appendix D: Some useful formulas 533
D.1 Stress 533

• Normal and shear stress on a plane 535
• Principal (normal) stresses 536
• Principal shear stresses 537
• Mohr’s circle 538

D.2 Strain 539

• Strain rosettes 539
• Small strain–displacement relations 541

D.3 Stress–strain relationships, Hooke’s law 541

• Hooke’s law in one dimension – Young’s modulus and shear modulus 541
• Hooke’s law in two-dimensions – plane stress and plane strain 549

References 551
Index 557

Download Here