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  • Recent Advances in Underground Mining Engineering : Coal

About The Book :

But for all the headlines about oil prices and climate change, the most important energy story -indeed, the energy story of the last four decades-has been the growth in global coal demand. In a December'2014 report, the International Energy Agency releases its annual report on the coal market. Their findings: global coal prices are falling and coal demand is rising. Since 1973, no other form of energy has grown faster than coal. And the IEA expects that coal demand will continue growing through 2019 by more than 2 percent per year. Perhaps even more astounding is the IEA's projection that by 2019 pr sp, on a BTU basis, global coal use will exceed global oil use. Why is coal demand growing? The answer is simple: the countries of the world need cheap electricity and coal is the perfect fuel for producing that power with relatively better security. Coal is her to stay because, politicians and investors understand that coal can provide the vast quantities of electricity their people need at prices they can afford. And in all these, underground mining of coal will play a role. In spite of its growing importance, underground mining engineering of coal has not got the attention it deserves. This book is a recent treatise on the underground engineering of coal for extraction. It provides a compilation of the recent knowledge in the area.

Book Contents:

Page No Chapter-1:-Multiple Seam Longwall Mining in the U.S.-Lessons for Ground Control 1 Abstract 1 Introduction 1 Overview 2 Hazards Associated with Multiple Seam Mining 3 Overmining Interactions: Two Case Histories from Pennsylvania 5 Undermining Interactions: Two Case Histories from Central Appalachia 7 Multiple Seam Longwall Mining with Yield Pillars in Utah 11 Conclusions 15 References 16 Chapter-2:-Recent Developments in Longwall Mining Entry Development, and Room and Pillar Systems 18 Synopsis 18 Underground Longwall Mining 19 World's Highest Longwall Shearer 19 World's Largest and longest life Roof Support 20 World's first Full Cycle Automation of Roof Supports- The RS20s Roof Support Control System 21 Widest Longwall Panels 22 Biggest Armoured Face Conveyors 22 New Low seam extraction of coking coal and high quality steam coals 23 Longwall Automation 24 New Approach to Rapid Longwall Development 24 Advances in Miner Bolter Design 25 Room & Pillar Mining 26 Wethead Systems � significantly reduced dust make 26 World Record for advance �Flexible Conveyor Train (FCT) 27 References 28 Chapter-3:-The Ground Response Curve, Pillar Loading and Pillar Failure in Coal Mines 29 Abstract 29 Introduction 29 Structural and Functional Failure of Pillars 29 Page No Ground Response and Pillar Stiffness 30 Ground Response Curve Determination 31 Modeling Method to Develop Ground Response Curves for Coal Mine Panels 31 Effect of Geology, Depth, Panel Width, and Pillar Extraction of the Ground Response Curve 33 Effect of the Geology and the Depth-to-Span Ratio 34 Effect of the Span 34 Ground Response at the Pillar Extraction Line 35 Adding Pillar Stress-Strain Curves 36 Equivalent Support Pressure 36 Initial Support Pressure 37 Pillar Performance and Ground Response 38 Loading of Stable Pillars 39 Stability of Yield Pillars 40 Pillars at the Extraction Line 41 Pillar Strain and Functional Failure 43 Conclusions 43 Disclaimer 44 References 44 Chapter-4:-Preventing Massive Pillar Collapses in Coal Mines 46 Introduction 46 Case Histories 46 Pillar Splitting (MINE A) 47 Pillar Splitting/Abutment Load Override (MINE C) 48 Small-Center Mining (MINE D) 49 FlooR Recovery (MINE G) 51 Summary of Case Histories 51 Mechanics of Massive Pillar Collapses 53 Design Approaches to Control Massive Pillar Collapse 55 Small-Center Mining: a Prevention Approach 56 Pillar Splitting: a Containment Approach 57 Conclusion 60 Reference 61 Chapter-5:-Different Uses of Analysis of Retreat Coal Mining Pillar Stability (ARMPS) Methods and Database 63 Introduction 63 The ARMPS Method 63 User Input 64 ARMPS stability factor for the active mining zone 64 Coal Strength 66 Page No Pillar Load-Bearing Capacity 70 Pillar Loadings 71 Verification of the ARMPS Method 73 Guidelines for Using ARMPS 76 Conclusions 77 References 77 Appendix a.-derivation of the Mark-Bieniawski pillar strength formula 78 References 82 Appendix b.-ARMPS case history data base 83 Appenedix C Example :Calculation and Method 86 Appendix d ARMPS case history data base 88 Size effect 90 Appendix E. Coal structure 90 Chapter-6:-Failure Probability of South African Coal Pillars 93 Synopsis 93 Keywords 94 Introduction 94 Methodology 95 Estimation of number of pillars and panels mined in South Africa 96 Estimate of total coal mined 97 Estimate of pillar and panel sizes 97 Pseudo probability of failure based on failed cases 100 Probability of failure based on a comparison of failed and stable cases 102 Implications for the industry 111 Summary and conclusions 113 References 114 Chapter-7:-Pre-evaluation of Old, small Coal Pillars for Secondary Mining 116 Synopsys 116 Introduction 116 Determining current pillar size 117 Determining input into numerical model 118 Non-yielding elements 119 Potentially yielding elements 119 Peak stress and strain 119 Residual stress and strain 119 Selection of area

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Recent Advances in Underground Mining Engineering : Coal

  • Rs15,400.00


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