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|The U.S. Bureau of Mines, in cooperation with a central Utah coal .mine operator, began a study in July 1988 into longwall gateroad designs applicable to deep, bump- prone mine conditions. Prior to the study, four adjacent longwall panels, incorporating a variety of panel entry configurations using "yielding' chain pi liars, experienced severe bumps and coal outbursts at the face and in the tailgate pillars during panel extraction, resulting in several lost-time accidents and a fatality. To quantify those factors primari1y responsible for bump occurrences during panel retreat, a field investigation was initiated to confirm the anticipated performance of a two-entry gateroad system employing a large, nonyielding chain pillar design. Hydraulic borehole pressure cells and roof-to-floor closure [convergence) measurement stations were installed to monitor gateroad abutment loading and entry closure during panel extraction. Study results indicate that very high confinement of the coal seam by strong roof and floor members existing across the entire property, in conjunction with overburden depths in excess of 1.600 feet, provides for bump-scale energy storage in not only gate pillars, but along the entire periphery of the active mining area. Insufficient gate pillar designs were also identified as possibly enhancing the occurrence of bumps in the tailgate and adjacent face areas.|
Additional chapters/articles from the SME-ICGCM book Ninth Conference on Ground Control Mining Proceedings (ICGCM) 9th
|Multiple-Seam Mining - A State-Of-The-Art Review||Design Aspects In Multiple-Seam Mining: Case Studies||Jenmmar Compression Roof Control System||Specialty Truss System And Their Performance||A Case Study Of Grouted Roof Bolt Loading In A Two-Entry Gat||Analysis And Field Testing Of Presupport Application In Coal||Development Of Roof Stitching As A Method Of Support In Indi||Control Of Roadway Closure In Underground Coal Mines By Side||An Application Of Fem Back Analysis Method To Mine Roadway||Controlled Blasting During Drifting In Hard Rock Mine||Field Test Results On Dyna-Rok And Dyna-Rok Plus Anchors||Mine Pillar Stability Analysis Using Fem Methods - Two Case||An Analytical Approach For The Estimation Of Pillar Strength||International Conference On Ground Control In Mining Design||A New Rock Mass Failure Criteria Based On Rate Of Movement||Practical Consideration In Longwall Support Selection||Mine-Wide Monitoring Applications In Ground Control Research||Longwall Stability Analysis Of A Deep, Bump-Prone Western Co||Stability And Control Of Immediate Roof Of Fully Mechanized||An Analysis Of Longwall Shield Cycle Effectiveness By Polyco||The Impact Of Three Longwall Coal Mines On Streamflow In The||Progressive Failure Of The V-Day Mine And A Comparison With||Controlling Subsidence Effects Using Partial Backfilling||Potential Of A Void Diffusion Model To Predict Longwall Subs||The Use Of Rim- To Detect Geologic Anomalies In The Clarion||The Effect Of Hazardous Geologic Structures On Gateroad Stab||Improved Source Location And Evaluation Of Seismic Events Ov||Application Of Short-Term Time-Dependent Plate Loading Tests||Determination Of Classification Parameters For Clay - Bearin||Intrinsic Response Of Borehole Pressure Cells Laboratory Cal||Application Of Sliding Roof Bar Powered Support For Thick-Se||Drainage Of Water From Abandoned Mines By Horizontal Drillin||A Statistical Analysis Of Falls Of Ground In South African C||Three-Dimensional Analysis Of Mine Dump Point Stability||Birth Of A Longwall-Initial Planning To Post-Subsidence Miti||Progressive Hangingwall Caving And Subsidence Prediction At|