Results 1 - 6 of 6

• Overview of Current US Longwall Gateroad Support Practices: An Update
  12/1/2019 - Peer reviewed journal articles
  An overview of recent trends in US longwall mining, with an emphasis on accident and injury trends, as well as support systems and ground conditions.
• Ground Response to High Horizontal Stresses During Longwall Retreat and its Implications for Longwall Headgate Support
  2/19/2019 - Peer reviewed journal articles
  An article discussing roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.
• Analysis of Global and Local Stress Changes in a Longwall Gateroad
  2/5/2019 - Peer reviewed journal articles
  An analysis of a numerical-model-based approach for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall face.
• A Retrospective Assessment of Longwall Roof Support with a Focus on Challenging Accepted Roof Support Concepts and Design Premises
  8/1/2006 - Conference papers
  This paper explores the history of longwall shield design over the past 25 years. It also addresses questions such as whether two-legged designs are better than four-legged shields and whether setting pressures should be set as high as possible.
• Technology News 445 - Updated Analysis of Longwall Pillar Stability (ALPS) Computer Program Incorporates New Coal Mine Roof Rating (CMRR)
  2/1/1995 - Technology News
  The objective of this work is to develop a comprehensive, practical method for designing longwall gate entries that considers coal pillar size, mine roof quality, and artificial support in an easy-to-use computer program.
• Analysis and Design Considerations for Superimposed Longwall Gate Roads
  1/1/1992 - Information Circulars
  A U.S. Bureau of Mines investigation of longwall panel layouts to maximize coal recovery and minimize interactive problems in multiple-seam operations.