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Mining Publication: Longwall Retreat of Gate Road Pillars
Keywords: Chain pillars Longwall mining Longwall shields Retreat mining
Original creation date: January 1993
Authors: JM Listak, ER Bauer
Report of Investigations - January 1993
Download PDF Document (1.21 MB)
NIOSHTIC2 Number: 20022452
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9444, 1993 Jan; 1-15
The report describes a U.S. Bureau of Mines investigation into the removal of gate road chain pillars in conjunction with longwall retreat mining. The research objective was to determine, through evaluations of the loads imposed on the gate road pillars and supplemental support elements in the entries, how the pillars, supplemental support, and entries were affected by the longwall abutment pressure. To achieve this goal, vibrating wire stressmeters and hydraulic flatjack pressure cells were installed in the support elements to monitor stress change caused by abutment pressure as a function of longwall face advance. The findings documented in the report are the result of information collected from instrumentation and observation at the mine. Pillar and support loading measurements and stability observations revealed that the roof and the support elements remained stable during panel retreat, while the face progressed at a normal rate of advance. The ability to safely and efficiently mine chain pillars during panel retreat increases resource recovery and can provide several other benefits described in the report.
Image of publication Longwall Retreat of Gate Road PillarsReport of Investigations - January 1993
Download PDF Document (1.21 MB)
NIOSHTIC2 Number: 20022452
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9444, 1993 Jan; 1-15
See Also
Analysis and Design Considerations for Superimposed Longwall Gate Roads
Controlling Respirable Dust in Coal Mining Operations
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Examination of Design and Operation Practices for Longwall Shields
Influence of Longwall Mining on the Stability of Gas Wells in Chain Pillars
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Pumpable Roof Supports: An Evolution in Longwall Roof Support Technology
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
The State-of-the-Art in Coal Pillar Design
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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