Results 51 - 60 of 137

• Shotcrete Design and Installation Compliance Testing: Early Strength, Load Capacity,Toughness, Adhesion Strength, and Applied Quality
  4/1/2015 - Reports of Investigations
  A report on a research study to document and develop safe practices for the use of shotcrete as ground support in underground mines, particularly in underground metal mines operating in weak host rock.
• Weak Rock Mass in Nevada Gold Mines: Behavior, Support Design, and Performance
  7/17/2014 - Contracts and cooperative agreements
  A capacity-building contract to address ground control design issues in weak rock masses in Nevada.
• ARBS - Analysis of Roof Bolt Systems
  8/20/2013 - PC software
  A software program to help select roof bolts for primary support in underground coal mines
• An Analysis of Flexural Strength and Crack Width for Fiber-Reinforced Shotcrete Used in Weak Rock Mines
  1/1/2011 - Peer reviewed journal articles
  NIOSH is investigating the use of shotcrete in weak rock mass mines with the objective of reducing fatalities and injuries resulting from rock fall accidents.
• In Situ Estimation of Roof Rock Strength using Sonic Logging
  9/1/2010 - Peer reviewed journal articles
  Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. This paper describes research aimed at developing a correlation for use in the U.S.
• Evaluation of Tailgate Ground and Support Interaction in the Illinois Basin for the Development of a Ground Reaction Curve Based Standing Support Design
  7/1/2009 - Conference papers
  As part of an effort to obtain more field data on longwall tailgate and support interaction, a study was conducted at a longwall mine in the Herrin No. 6 coal seam in southern Illinois.
• A Roof Quality Index for Stone Mines Using Borescope Logging
  7/1/2009 - Conference papers
  A process is presented that relates the structures and their locations to provide a numerical value, or roof quality index that can be used to assess roof stability.
• Reinforcing Coal Mine Roof with Polyurethane Injection: 4 Case Studies
  10/1/2008 - Peer reviewed journal articles
  This paper gives the results of 4 case studies concerning the interaction between polyurethane (PUR) and coal mine roof in order to determine the mechanism of reinforcement, in both highly fractured rock and unfractured rock.
• Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
  7/1/2008 - Conference papers
  The objective was to determine whether a qualitative but coherent redistribution of velocity, indicating change in location of induced stress, could be imaged as mining occurred in known locations by using a local earthquake tomography software.
• 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.