Ground Response and Support Interaction in Coal Mine Longwall Gateroads Subject to Changing Stress

Details

• Personal Author:
  Barczak, Thomas M. ; Dougherty H ; Esterhuizen, Gabriel S. ; Tulu IB
• Description:
  Gateroad entries provide access to the operating face in longwall coal mines. These entries are subject to significant changes in the vertical and horizontal stress caused by stress redistribution around the approaching longwall panel. Estimating the required support for these extreme conditions is difficult because the rock is typically in a post-peak loading condition associated with large deformations. This paper presents a conceptual model of support loading and deformation caused by longwall-induced stress changes that is based on in-mine monitoring studies and numerical modeling results. The conceptual model is based on the principle that the volume of the detached roof that may collapse during a roof fall represents the load that must be controlled by the support system. The model also considers the fact that stress-driven roof deformations are essentially irresistible and support systems should ideally yield without shedding load. An example is provided in which the effect of roof dilation on roof reinforcement and standing supports is evaluated and the ability of the system to control the deadweight load of the detached roof strata is assessed. The conceptual model can be used to develop an understanding of likely support performance during the design of longwall gateroad support systems. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety
• Keywords:
  Coal Mining Ground Control Ground Monitoring Longwall Mining Mathematical Models Rock Mechanics Roof Support Systems Underground Mines
• Series:
  Mining Publications
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 3 ; OSHA Region 8 ; 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
• NIOSHTIC Number:
  nn:20061727
• Citation:
  54th US Rock Mechanics/Geomechanics Symposium, June 28 - July 1, 2020, Golden, Colorado. Alexandria, VA: American Rock Mechanics Association (ARMA), 2020 Jun; :ARMA 20-1251
• Federal Fiscal Year:
  2020
• Peer Reviewed:
  False
• Source Full Name:
  54th US Rock Mechanics/Geomechanics Symposium, June 28 - July 1, 2020, Golden, Colorado
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5bf9c8be01658857449d044166843f97ec542453b77c6e21aee456f6a716094ff42947736e9f632e3aa8292b80dc7b1c4447e2654839f02ee253d602fece63a7
• Download URL:
  https://stacks.cdc.gov/view/cdc/215307/cdc_215307_DS1.pdf
• File Type:
  [PDF - 462.29 KB ]