Mining Product: Ground Support Factor of Safety Calculator

Original creation date: October 2020

Authors: S Warren, M Young, M Raffaldi, D Chambers, J Britton, D Benton

Software (Windows) - December 2020

Version: 1.0.15 Beta

Spokane, WA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2020 Nov

Beta Release: This software has not fully completed NIOSH's rigorous testing but is considered fully functional. Because of the high level of interest from numerous stakeholders this beta version is being made available now. Send comments to mining@cdc.gov.

The Ground Support Factor of Safety Calculator software calculates deadweight factor of safety (FOS) for an underground mining excavation’s ground support design based on user inputs and methods described by Pakalnis [2008, 2014]. Both two-dimensional (2D) design and 3-dimensional (cone) options are available for drift and intersection design, respectively.

Limitations

The software is intended for the static design of rock reinforcement (cables and rockbolts) against estimated deadweight rock loads. It does not consider ground deformations or more complex loading mechanisms. Also, this design methodology does not consider surface support for the ground between rockbolts. This method was developed through experience in weak rock mass “hard rock” mines, at shallow to moderate depths. In the US it has been successfully implemented at depths less than 4000 ft below ground surface. Its applicability of this design mythology outside these conditions has not been assessed. The user should consult available published surface support design methodologies for such guidance.

Installation Notes:
  • Download and unzip the installer to a local folder.
  • Open the Installer folder and run GroundControlFOS_Setup.msi.
    • Check the ReadMe.txt for details on installation requirements.
3D of support cone in intersection with roof bolts indicated.
Software (Windows) - December 2020

Version: 1.0.15 Beta

Spokane, WA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2020 Nov


Page last reviewed: 12/11/2020 Page last updated: 12/11/2020