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Mining Publication: Design Parameters of Roof Support Systems for Pre-Driven Longwall Recovery Rooms
Keywords: Longwall mining Recovery rooms Support design and selection
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: February 2004
Authors: SC Tadolini, TM Barczak
Conference Paper - February 2004
Download PDF Document (0.33 MB)
NIOSHTIC2 Number: 20024570
2004 SME Annual Meeting, Feb 23-25, Denver, Colorado, preprint 04-54. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2004; :1-13
Reduction in the recovery time required and improvements in safety during a longwall face move have compelled coal mine operators to examine and use predriven longwall recovery rooms. The recovery entry is developed at the longwall stop position and supported ahead of time so that the required combinations of standing and internal supports can be installed before the longwall face approaches. A calibrated three-dimensional finite element model, developed in conjunction with an underground test area, provided the critical components and design principles for a comprehensive parametric study. The study indicates that vertical, horizontal, and shear stresses concentrated on the outby abutment pillar corner of the recovery room resulting in deformations in the immediate roof above the primary roof support anchorage level. The results of the numerical model and field site observations indicated that the combination of the internal bolting system and the standing concrete supports are critical for the successful and safe extraction of the longwall equipment. Cable supports installed at and angle over the pillars can help stabilize the disturbed zone above the adjacent fender and outby pillars; however, standing supports are required in most sedimentary roof conditions to increase stability and assure a safe longwall extraction.
Image of publication Design Parameters of Roof Support Systems for Pre-Driven Longwall Recovery RoomsConference Paper - February 2004
Download PDF Document (0.33 MB)
NIOSHTIC2 Number: 20024570
2004 SME Annual Meeting, Feb 23-25, Denver, Colorado, preprint 04-54. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2004; :1-13
See Also
Case History of the Response of a Longwall Entry Subjected to Concentrated Horizontal Stress
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Evaluation of the Impact of Standing Support on Ground Behavior in Longwall Tailgates
International Experience with Longwall Mining into Pre-Driven Rooms
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Overview of Current US Longwall Gateroad Support Practices: An Update
Performance of Roof Support Under High Stress in a U.S. Coal Mine
Rock Mass Behavior and Support Response in a Longwall Panel Pre-Driven Recovery Room
A Study of the Ground Control Effects of Mining Longwall Faces Into Open or Backfilled Entries
Two Sister Reports of Investigations on Ground Stress Research
Page last reviewed: June 14, 2016
Page last updated: June 14, 2016
Content source: National Institute for Occupational Safety and Health, Mining Program
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