Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options
CDC Home

Mining Project: Empirical Guidelines for Longwall Ground Control Design

Project DetailValue
Principal Investigator
  • Ted. M. Klemetti, NIOSH OMSHR, 412-386-5240
Start Date10/1/2010
End Date9/30/2014

To update the database of case histories upon which the Analysis of Longwall Pillar Stability (ALPS) software bases its recommended stability factors. Variables impacting successful pillar design will be re-evaluated.

Program Area
Keywordsground control, longwall mining, roof support systems

Research Summary

Nearly half of all underground coal miners work in longwall mines. These miners face hazards from major roof collapses that can block necessary escape routes and ventilation airways, and from injuries from falls of smaller volumes of rock and coal. Longwall mines depend upon a series of entries for safe access to and emergency egress from the face, and to provide critical ventilation of the working area and mined-out panels. These entries may be as great as 15,000 ft long and subjected to severe abutment pressures. A blockage in any of these entries has significant safety implications for the entire mine.

This project's overall goal was to update the database of case histories upon which the Analysis of Longwall Pillar Stability (ALPS) software bases its recommended stability factors and re-evaluate variables impacting successful pillar design to reflect modern mining scenarios.  The project aimed to  make an important contribution to the PART (Program Assessment Rating Tool) goals of reducing injuries from ground failures by 25% over 5 years, and reducing both fatalities and injuries from ground failures by 50% in 8 years. The project directly addressed Strategic Goal #6 of the Mining Program Strategic Goals for Intramural Research: Eliminate ground failure fatalities and injuries in the mining industry.

Longwall gateroad stability is critical to prevent tailgate collapses which could lead to fatalities and injuries. Proper pillar design and roof support is critical to stable and safe tailgates. The updated ALPS database will ensure the continued value of the ALPS design softwarwe, thus maintaining an important design tool for the mining industry. This project resulted in an updated and enhanced ALPS chain pillar design method to address the new and difficult mining conditions faced by the industry today. The anticipated outcome of safe pillar design will reduce the threat of tailgate blockages and other ground control related hazards.


On This Page

Contact Us:
  • Office of Mine Safety and Health (OMSHR)
  • National Institute for Occupational Safety and Health (NIOSH)
  • Centers for Disease Control and Prevention
  • 800-CDC-INFO
    TTY: (888) 232-6348
  • New Hours of Operation
    8am-8pm ET/Monday-Friday
    Closed Holidays
  • The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO
A-Z Index
  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
  7. G
  8. H
  9. I
  10. J
  11. K
  12. L
  13. M
  14. N
  15. O
  16. P
  17. Q
  18. R
  19. S
  20. T
  21. U
  22. V
  23. W
  24. X
  25. Y
  26. Z
  27. #