Results 1 - 10 of 178

• Ground Support Factor of Safety Calculator
  2/14/2022 - PC software
  Use this factor of safety calculator when designing an underground mining excavation’s ground support.
• CMRR - Coal Mine Roof Rating
  8/20/2013 - PC software
  Software for estimating the relative inherent strength of coal mine roof.
• Pillar and Roof Span Design Guidelines for Underground Stone Mines
  5/1/2011 - Information Circulars, Safety guidelines, tips, and checklists
  This document presents the results of research conducted by NIOSH in cooperation with participating underground stone mines to develop generally applicable guidelines for designing stable pillars and roof spans in stone mines.
• Early Strength Performance of Modern Weak Rock Mass Shotcrete Mixes
  1/1/2011 - Peer reviewed journal articles
  A field-expedient test method and portable on site test equipment have been developed to measure shotcrete strength in the first six hours after application.
• Numerical Model Calibration for Simulating Coal Pillars, Gob and Overburden Response
  7/1/2010 - Conference papers
  The paper provides a basic set of input data and a modeling approach that can be used for numerical modeling investigations of various coal mine designs using the FLAC3D software package.
• Roof Span Design for Underground Stone Mines
  7/1/2010 - Conference papers
  In this paper, the findings of a survey of roof span stability issues and design practices are presented, and the observed factors contributing to roof instability are discussed.
• STOP - Support Technology Optimization Program
  4/15/2010 - PC software
  Software to assist in making engineering decisions regarding the selection and placement strategy of various standing roof support technologies.
• Stability Mapping to Examine Ground Failure Risk: A Field Study at a Limestone Mine
  7/1/2009 - Conference papers
  This paper presents a description of geologic settings, mining conditions, rockmass characterization with geotechnical risk assessment, analysis, mapping, and control techniques used at an underground stone mine in Central Pennsylvania.
• Performance Characteristics for Welded Wire Screen Used for Surface Control in Underground Coal Mines
  2/1/2009 - Conference papers
  The load-deformation characteristics and the load capacity of welded wire screen (roof screen) used to control ground fall were evaluated in the laboratory in a specially built test frame.
• Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
  1/1/2008 - Peer reviewed journal articles
  Moisture-sensitive roof rocks have contributed to time-dependent roof falls. NIOSH research proves the value of a wet/dry cycling test for rock evaluation.