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Mining Publication: Analysis and Design Considerations for Superimposed Longwall Gate Roads
Keywords: Headgates Longwall mining Pillar design
Original creation date: January 1992
Authors: GJ Chekan, JM Listak
Information Circular - January 1992
Download PDF Document (0.97 MB)
NIOSHTIC2 Number: 10011183
U.S. Department of the Interior, Bureau of Mines, Information Circular 9305, 1992 Jan:1-14
The U.S. Bureau of Mines is investigating longwall panel layouts to maximize coal recovery and minimize interactive problems in multiple-seam operations. When coalbeds are longwall-mined in descending order, the transfer of stress from overlying gate roads is a major design constraint affecting pillar stability in the lower mine. The lower mine gate road pillars must be properly designed to withstand the additional load transfer if gate roads are superpositioned in successive seams. The Bureau's MULSIM/NL model, a boundary element computer program, was used to analyze load transfer mechanics for superpositioned gate road pillars. Analysis of longwall pillar stability (ALPS), an empirically based design method for longwall gate road pillars, was used to calibrate model input parameters. ALPS provided a basis to verify model trends and to recommend limits for safe pillar design when superpositioning longwall gate roads. The attributes of the MULSIM/NL model and ALPS were combined to develop a modified method for estimating pillar stress for multiple-seam cases. The modified method uses a multiple-seam factor (MS) to estimate the stress on superpositioned lower mine gate road pillars. Numerical analysis shows that MS depends on the interburden thickness and pillar width.
Image of publication Analysis and Design Considerations for Superimposed Longwall Gate RoadsInformation Circular - January 1992
Download PDF Document (0.97 MB)
NIOSHTIC2 Number: 10011183
U.S. Department of the Interior, Bureau of Mines, Information Circular 9305, 1992 Jan:1-14
See Also
Analysis of Global and Local Stress Changes in a Longwall Gateroad
Analysis of Multiple Seam Stability
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Empirical Guidelines for Longwall Ground Control Design
Ground Control Research: Considering Local Geology to Improve Longwall Pillar Stability
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Overview of Current US Longwall Gateroad Support Practices: An Update
The State-of-the-Art in Coal Pillar Design
Technology News 445 - Updated Analysis of Longwall Pillar Stability (ALPS) Computer Program Incorporates New Coal Mine Roof Rating (CMRR)
Technology News 516 - ARMPS-HWM: New Software for Sizing Pillars for Highwall Mining
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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