Mine Planning For Longwall And Pillar Retreat Panels Subject To Seam Interaction Effects

Vandergrift, Thomas L.
Organization: International Conference on Ground Control in Mining
Pages: 9
Publication Date: Jan 1, 2000
Multiple-scam mining is becoming more common in the United States, especially in the East, where primary reserves arc being depleted, forcing mining companies to develop secondary seams, Although mine engineers and planners are aware of the basic effects of seam interaction and generally follow guidelines for columnizing entries and avoiding load abutments, mine design earn greatly benefit bum more quantitative estimates of scam interaction effects. This paper presents case studies from two eastern mines subject to seam interaction effects where pre-mining stresses were quantified: the Mingo Logan Coal Company's Mountaineer Alma A Mine, and Peabody Group's Lightfoot No. 2 Mine. In each of these mines. mining is being carried out within 60 to 90 ft of overlying longwall and pillar panels under maximum cover of about 1,100 ft As part of overall mine planning and design efforts al these mines. NSA Engineering performed numerical modeling analyses using the non-linear boundary-element code MULSIM/NL Input parameters were calibrated by modeling areas where ground conditions resulting from seam interaction were well documented. By incorporating actual cover loading based on topography and seam dip, and the integrity of remnant, gate road, arid harrier pillars in the overlying mines, the pre-mining vertical stress in the underlying scants was estimated based on the pre-mining stress, plans for mains, gate road, bleeder, and pillar panels were developed. Although mining experience in these areas has beers somewhat limited to date, she designs developed as a result of these analyses have so far proven successful.
Full Article Download:
(2511 kb)

Additional chapters/articles from the SME-ICGCM book Proceedings 19th International Conference On Ground Control In Mining

An Approach To Identifying Geological Properties From Roof B
Field Experience Of Measuring The Acoustic Energy From A Ham
Advancements In Reflective Seismic Tomography For The Locati
Longwall Geomechanics, An Australian Perspective
Moonee Colliery: Renewing The Economic Viability Of A Mine U
Successful Application Of Hydraulic Fracturing To Control Wi
Pillar Mining And Longwalling Below Massive Roof Strata: Geo
High Capacity Tensioned Cable Bolts For Tailgate Support
Single Point And Full Scale Laboratory Testing Of Timber Cho
Optimizing Secondary Roof Support With The NIOSH Support Tec
The Use Of Cribless Tailgates In Longwall Extraction
Five Stress Factors Conducive To Bumps In Utah, USA, Coal Mi
Development Of Stress Measurement Techniques In Bump-Prone C
Coal Mine Seismicity And Bumps: Historical Case Studies And
Multi-Scale Assessment Of Coal And Gas Outbursts Based On Fr
Horizontal Stress: The Root Of All Evil?
Utilizing The ?Advance And Relieve? Method To Reduce Horizon
Regional Horizontal Surface Displacements Due To Mining Bene
Prognosis And Control Of Mining Induced Surface Subsidence A
Prediction Of Subsurface Subsidence For Longwall Mining Oper
Development Of A Statistical Technique For Assessing Sandsto
Evaluation Of Surface Subsidence Potential Along A Pipeline
Roof Monitoring In Limestone Mines-Experience With The Roof
Site Characterization For Planning Underground Stone Mines
Potential Problems Related To Mining Under Or Adjacent To Fl
Mine Planning For Longwall And Pillar Retreat Panels Subject
Optimization Of District-Wide Mine Layout In Multi-Seam Mini
Application Of Bolt Design Criteria At Galatia Mine
The Utilization Of Rockbolting Technology And Monitoring Tec
Rockbolting For Highly Stressed Roadways
Evaluation Of Measurement System For Monitoring The Stabilit
Quality Management For Grouted Rockbolts
Evaluating Anchorage Mechanisms Of Fully Encapsulated Rock B
INSTáL CableOx: A New Tensionable & Corrosion Resistant Cabl
Rock Reinforcement Longevity
Progress In The Development Of A Roof Bolt Design Methodolog
Case Studies Of Progressive Pillar Failure In Two Mines Usin
Jointing Effects On Pillar Strength
Impact Of Vertical Stress On Roadway Conditions At Dartbrook
Stepwise Support Technology For Extremely Soft Rock Roadway
Mobile Roof Supports For Pillar Retreat Mining
Three-Dimensional Simulations Of The Roof Behavior In Coal R
Roof Behavior In South African Coal Room And Pillar Panels
Extended Cut Out Distances In Continuous Miner Sections In S
Roof Control Analysis In North River Mine
Analysis Of The Seam Inclination Effect On Roof Stability
The Application Of Rock Mass Classification Principles To Co
Mining Geotechnical Benchmarking
Using The Point Load Test To Determine The Uniaxial Compress
The Influence Of Water Content On Strength Characteristic Of
Polymer Membrane Liners In Underground Coal Mines - Ground C
Applications Of Cement Grouting Method For Controlling Weak
Analysis Of Safety Aspects And Mining Practices For Effectiv