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Coal mine ground control

Author: Syd S Peng
Publisher: Morgantown, WV : Dept. of Mining Engineering/College of Engineering and Mineral Resources, ©2008.
Edition/Format:   Print book : National government publication : English : 3rd edView all editions and formats
Summary:
This book includes 14 chapters. It begins with the introduction of U.S. coal mining methods in chapter I. Rock properties and in-situ stresses are described in chapter two. The geological conditions that form the rock strata and their anomalies as well as the geophysical methods employed to detect the anomalies are illustrated in chapter three. Chapter four contains an exhaustive list of topics on roof bolts and
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Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Syd S Peng
ISBN: 9780978938345 0978938348
OCLC Number: 277087221
Notes: "A Wiley-Interscience publication."
Description: xi, 750 pages : illustrations (some color) ; 25 cm
Contents: Machine derived contents note: Mine Layouts and Ground Control Practices in U.S. Coal Mines --
1.1 Definition of Ground Control --
1.2 U.S. Coal Mining Methods and Production --
1.3 Coal Mine Layouts and Ground Control Practices 3 --
1.4 Ground Control in Coal Mining 22 --
1.5 Interaction of Ground Control with Other Subsystems of Underground --
Coal Mining 23 --
Rock Properties and In-Situ Stresses 29 --
2.1 Introduction 30 --
2.2 Basic Rock Properties 30 --
2.3 Determination of Rock Properties 32 --
2.4 Strength of Rock/Coal Obtained in the Laboratory 42 --
2.5 Failure Criteria for Coal Measure Strata 44 --
2.6 Major Factors Controlling Rock/Coal Behavior 51 --
2.7 In-situ Stresses 64 --
Geology and Geophysics 77 --
3.1 Introduction 78 --
3.2 Coal-Forming Depositional Environments --
3.3 Discontinuities (Anomalies) of Coal and Its Surrounding Rocks 81 --
3.4 Coal Measures Rock Strata 109 --
3.5 Geology, Ground Control, and Mine Design and Planning 114 --
3.6 Detection of Geological Anomalies by Geophysical Methods 122 --
Roof Bolting 145 --
4.1 Introduction 147 --
4.2 Type of Bolts 148 --
4.3 Tensioned Bolts --
4.4 Non-Tensioned (Passive) Bolts 160 --
4.5 Fully-Grouted Tensioned Rebar Bolts 174 --
4.6 Trusses and Sling 175 --
4.7 Roof Bolt System Hardware 179 --
4.8 Mechanisms of Roof Bolting 186 --
4.9 Methods for Designing Roof Bolting Systems 196 --
4.10 Drilling of Bolt Holes 218 --
4.11 Nondestructive Testing of Bolt Failure 222 --
4.12 OneStep Bolts 222 --
Coal Pillars 225 --
5.1 Introduction 226 --
5.2 Factors Affecting Pillar Strength 229 --
5.3 Pillar Design Methods 237 --
5.4 Yield Pillar 259 --
5.5 Barrier Pillars 267 --
5.6 Modes of Pillar Failures 269 --
5.7 Long-Term versus Short-Term Pillar Strength 273 --
5.8 Pillar Extraction 275 --
5.9 Web Pillars for Highwall Mining 279 --
5.10 Dewatering and Pillar Strength 282 --
5.11 Pillar Design for Gas/Oil Wells 283 --
5.12 Case Examples-Pillar Dimensions Using Various Design Methods 284 --
High Horizontal Stresses 287 --
6.1 Introduction 288 --
6.2 Effects of Horizontal Stress Orientation and Cutting Sequence on --
Entry Stability 288 --
6.3 Cutter Roof and High Horizontal Stresses 303 --
6.4 Effects of Topography under High Horizontal Stress 305 --
6.5 Intersections of Entries and Crosscuts under High Horizontal Stress 307 --
6.6 Geological Anomalies and Horizontal Stress 309 --
6.7 Stress Mapping 310 --
6.8 Horizontal Stress and Roof Supports 312 --
6.9 Complete Stress Analysis and Application of High Horizontal Stresses 314 --
Longwall mining 315 --
7.1 Introduction 317 --
7.2 Panel Layout and Gateroad Systems 317 --
7.3 Overburden Movement 319 --
7.4 Abutment Pressure and Gateroad Convergence 335 --
7.5 Shield Design 346 --
7.6 Roof /Rib Falls and Floor Heave at Longwall Faces 359 --
7.7 Effect of Panel Width 363 --
7.8 Faults and Geological Anomalies 367 --
7.9 Gateroad Pillar Extraction 370 --
7.10 Pre-driven Recovery Room and Mining through Open Entries 371 --
7.11 Hard-to-Cave Roof 376 --
7.12 Bridging and Cyclic Failures of Strong Roof Layers 381 --
7.13 Tailgate and Headgate Supports 382 --
Multiple-Seam Mining 389 --
8.1 Introduction 390 --
8.2 Sequence of Multiple-Seam Mining 390 --
8.3 Interaction Factors 391 --
8.4 Interaction Mechanisms 398 --
8.5 Ultra-Close Multiple-Seam Mining 407 --
8.6 Design of Multiple-Seam Mining Plan 410 --
8.7 Three-Seam Mining 417 --
8.8 Multiple-Seam Highwall Mining 418 --
Bumps 421 --
9.1 Introduction 422 --
9.2 Occurrence of Coal Bumps 423 --
9.3 Causes and Mechanisms of Coal Bumps 434 --
9.4 Magnitude and Damage of Coal Bumps 444 --
9.5 Methods of Bump Control 446 --
9.6 Prediction of Bumps by Microseismic Method 455 --
Roof/Rib Falls and Floor Heaves 461 --
10.1 Introduction 462 --
10.2 Roof Falls 462 --
10.3 Cutter Roofs 475 --
10.4 Rib Falls 482 --
10.5 Shale and Its Role on Mine Roof Stability 486 --
10.6 Floor Heave 498 --
Instrumentation 507 --
11.1 Introduction 508 --
11.2 Load-Measuring Devices 508 --
11.3 Stress-Measuring Devices 510 --
11.4 Deformation-Measuring Devices 529 --
11.5 Strain-Measuring Devices 536 --
11.6 Bearing Capacity Tester 537 --
11.7 Borehole Observation Devices 540 --
11.8 Overburden Strata Movement Monitoring Devices 541 --
11.9 Longwall Shield Monitoring Devices 548 --
11.10 Borehole Penetrometer 550 --
Computer Modeling 551 --
12.1 Introduction :553 --
12.2 Methods of Numerical Modeling 554 --
12.3 Constitutive models of Coal/Rocks/Gob 557 --
12.4 Calibration/Validation of Computer Models 562 --
12.5 Case Example 1 --
Design of a New Room-and-Pillar Mine 563 --
12.6 Case Example 2 --
Design of Longwall Gateroad Chain Pillars 575 --
12.7 Case Example 3 --
Roof Bolting 590 --
12.8 Case Example 4 --
Multiple-Seam Mining 597 --
12.9 Case Example 5 --
Gas Well Stability 606 --
12.10 Case Example 6 --
Surface Subsidence 610 --
Surface Subsidence 616 --
13.1 Introduction 617 --
13.2 Characteristics of Surface Movement 617 --
13.3 Effects of Geological and Mining Factors 625 --
13.4 Subsidence Prediction Methods 628 --
13.5 Final Subsidence in Hilly Regions 633 --
13.6 Final Subsidence Induced by Chain Pillars 636 --
13.7 Dynamic Subsidence and Subsidence Duration 638 --
13.8 Long-Term Subsidence 644 --
13.9 Surface Subsidence Prediction Software 645 --
13.10 Surface Subsidence Monitoring 648 --
13.11 Subsidence Influence Assessment and Mitigations 653 --
13.12 Subsidence Mitigations 655 --
13.13 Final Subsidence over Irregular Mine Openings 660 --
Highwall Stability 663 --
14.1 Introduction 664 --
14.2 Highwall Characteristics 665 --
14.3 Factors Affecting Highwall Stability 665 --
14.4 Types of Highwall Failures 665 --
14.5 Failure Analysis 669 --
14.6 Portal Stability 672 --
14.7 Monitoring of Slope Movement 675 --
14.8 Surge, Spoil, Waste, and Truck-Built Stock Piles 676.
Responsibility: Syd S. Peng.
More information:

Abstract:

This book includes 14 chapters. It begins with the introduction of U.S. coal mining methods in chapter I. Rock properties and in-situ stresses are described in chapter two. The geological conditions that form the rock strata and their anomalies as well as the geophysical methods employed to detect the anomalies are illustrated in chapter three. Chapter four contains an exhaustive list of topics on roof bolts and roof bolting systems going back to their first introduction in the late 1940s. Chapter five covers the evolution of pillar design from 1876 to present, emphasizing the various elements affecting pillar strength and their methods of design, with information highlighted on the pros and cons of each method.

Chapter six is devoted to explaining the myths of high horizontal stresses that have been commonly blamed for most roof control problems in recent years. Chapter seven is longwall mining. It contains all the elements of the subjects that I experienced in my research and consulting career. Factors affecting and mine plan designs for multiple seam mining are addressed in Chapter eight. Chapter nine deals with bumps and covers the occurrence, factors affecting, mechanisms, and control of bumps. Entry stability problems including roof and rib falls and floor heaves and their control and supporting methods are addressed in chapter ten.

Chapter eleven illustrates the theories and methods of various types of underground and surface instrumentation. The various types of material models used in computer modelings and model calibration and case examples are included in chapter twelve. Surface subsidence is addressed in chapter thirteen which covers characteristics, factors, affecting, survey, prediction, and damage assessment and mitigation of surface subsidence. Highwall stability the only subject related to surface mining is covered in chapter fourteen. --Book Jacket.

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