Assessing Longwall Gateroad Ground Response and Support Alternatives

Details

• Personal Author:
  Dougherty H ; Esterhuizen, Gabriel S. ; Klemetti, Ted M. ; Sears MM ; Tulu IB ; van Dyke M ; Zhang P
• Description:
  Ground falls in longwall gateroad entries remain a concern in modern longwall operations. The gateroads are subject to changing horizontal and vertical ground stress induced by longwall extraction. These stress changes can result in failure of the strata around an entry leading to large deformations of the entry roof, floor and ribs. The gateroad support systems are required to control the failed strata while maintaining safe access to the longwall face and unimpeded ventilation. This paper presents research conducted to better understand the stability issues in gateroad excavations and to develop procedures for evaluating support and layout alternatives for longwall gateroads. Using the results of a field-monitoring program and numerical model analysis of case histories, a conceptual model of gateroad support needs was developed. The conceptual model formed the basis for developing a set of equations that can be used to estimate likely roof sag and support loading for given roof geology and longwall-induced loading conditions. The developed equations were used to compare predicted gateroad stability to field study results, showing satisfactory agreement. The calculation procedures are used to demonstrate their application in assessing support alternatives at a case study mine. It is concluded that the developed analysis procedures provide realistic assessments of likely ground stability and can be used to evaluate alternative gateroad support systems at operating longwall mines. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Author Keywords: Longwall Gateroad Ground Control Horizontal Stress Longwall Mining Mine Safety Mining Engineering Models Monitoring Numerical Modeling Roof Supports Strata Control Support Design

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• Series:
  Mining Publications
• ISSN:
  0026-5187
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  41-43
• Volume:
  73
• Issue:
  11
• NIOSHTIC Number:
  nn:20064221
• Citation:
  Min Eng 2021 Nov; 73(11):41-43
• Email:
  eee5@cdc.gov
• Federal Fiscal Year:
  2022
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  Mining Engineering
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:244ded7c48c606f657a26aa1a7f8ce5cf902c8744ac0f182f3c351b3c66d4b474365e1b362f699aef908db4c29874773fa3f5273808c7bc8698f05442772e0be
• Download URL:
  https://stacks.cdc.gov/view/cdc/215478/cdc_215478_DS1.pdf
• File Type:
  [PDF - 639.12 KB ]