Results 31 - 40 of 92

• Ground Failures in Coal Mines with Weak Roof
  1/1/2010 - Peer reviewed journal articles
  An understanding of the geologic and stress conditions which lead to roof falls is necessary to assess the risk of failure and to design roof reinforcement to improve stability.
• A Hydrodynamics-Based Approach for Predicting the Blast Damage Zone in Drifting as Demonstrated Using Concrete Block Data
  8/1/2009 - Peer reviewed journal articles
  This paper presents a blast design technique based on a hydrodynamic method and introduces modifications to account for different explosives from those used in a calibration test.
• Current Trends in Reducing Ground Fall Accidents in US Coal Mines
  2/1/2009 - Conference papers
  Each of the electronic versions of the MSHA fatality reports since 1995 was analyzed in detail, categorized by the type of the ground fall hazard. The remainder of the paper is devoted to evaluating each of the five largest categories.
• Overview of Coal Mine Ground Control Issues in the Illinois Basin
  12/1/2008 - Peer reviewed journal articles
  NIOSH has been actively gathering ground control information in the Illinois Basin in an effort to understand and control difficult mining conditions and has documented best practices for screen installation.
• Dynamic Failure in Deep Coal: Recent Trends and a Path Forward
  7/1/2008 - Conference papers
  The centerpiece of this project is development of a Dynamic Failure Control Program to monitor evolution of dynamic failure hazards with changing geologic conditions to assure that control and protective measures are appropriately deployed.
• Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
  7/1/2008 - Conference papers
  This paper describes a case study where a surface-based microseismic system, using triaxial geophones in boreholes drilled from the surface, was deployed at a large limestone mine.
• Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
  6/1/2008 - Peer reviewed journal articles
  This paper describes a modeling approach that can be used as a tool to evaluate potential roof failure and optimize the stability of room and pillar layouts.
• A Case Study Examination of Two Blast Rounds at a Nevada Gold Mine
  1/1/2008 - Conference papers
  NIOSH researchers collected basic data from two blast rounds at the SSX-Steer Mine as a component of a larger study on controlled blasting, the goal of which is to reduce injuries from falling rocks in underground mines.
• Methods for Determining Roof Fall Risk in Underground Mines
  11/1/2007 - Peer reviewed journal articles
  This paper discusses a method to determine the roof fall risk using a qualitative risk analysis technique.
• Proceedings: New Technology for Ground Control in Multiple-seam Mining
  5/1/2007 - Information Circulars, NIOSH/USBM numbered publications
  Multiple-seam interactions are a major ground control hazard in many U.S. underground coal mines. NIOSH has been conducting research to develop better techniques for predicting the location and severity of multiple-seam interactions.