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
Version: 1.1.11
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 Oct
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 U.S. it has been successfully implemented at depths less than 4000 ft. below ground surface. The applicability of this design methodology outside these conditions has not been assessed. 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.

Version: 1.1.11
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 Oct
- A Case Study of Bolt Performance in a Two-entry Gate Road
- Determination of Physical Properties of Cable Bolts in Cement Grout Pull Tests Using Instrumented King Wires
- Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
- Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
- Overview of Coal Mine Ground Control Issues in the Illinois Basin
- Pillar and Roof Span Design Guidelines for Underground Stone Mines
- Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
- Technology News 482 - Ground Support Safety Training Video
- Tests of Fibre-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana
- Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design Features