Results 121 - 130 of 225

• Comparison of the Transverse Load Capacities of Various Block Ventilation Stoppings under Arch Loading Conditions
  6/1/2008 - Conference papers
  This paper compares the transverse load capabilities of several block materials and wall dimensions commonly used in stopping constructions based upon simulated three-hinge, rigid-arch loading tests of half-wall constructions.
• Empirical Design of Span Openings in Weak Rock based upon Support Type Employed
  6/1/2008 - Conference papers
  This work attempts to provide rock mechanic tools that will enable a mine operator to make economic decisions that will also ensure a safe working environment.
• Rock Mass Behavior and Support Response in a Longwall Panel Pre-Driven Recovery Room
  3/1/2008 - Conference papers
  Some surprising results were revealed in this study designed and implemented by NIOSH to evaluate the effectiveness of pre-driven longwall recovery rooms supported with pumpable concrete roof supports.
• Technology News 529 - New Technology for Ground Control in Multiple-Seam Mining
  11/1/2007 - Technology News
  Research by NIOSH on multiple-seam mining has resulted in two ground control products. The first is IC 9495 which is a proceedings document. The second is the Analysis of Multiple-Seam Stability software package. Each product is briefly described.
• Improving the Capability for Real Time Assessment of Roof Conditions Through Intelligent Roof Bolt Drilling Operations
  7/1/2007 - Conference papers
  An intelligent drilling system has been developed that can complement scoping and core analysis to provide a more complete picture of roof strata and is capable of seeing features or conditions that are not always obvious in more traditional methods.
• The Unpredictable Life Cycle of a Coal Pillar
  7/1/2007 - Conference papers
  A unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. The complete transformation took place in less than 12 hours.
• Roof Screening for Underground Coal Mines: Recent Developments
  7/1/2007 - Conference papers
  This paper describes some successful techniques and machine modifications that were evaluated for ergonomic considerations and are being used in productive mines to assist with roof screen installation.
• Roof Stability Issues in Underground Limestone Mines in the United States
  7/1/2007 - Conference papers
  This paper presents the results of a study of roof conditions in 34 limestone mines in the Eastern and Midwestern U.S.
• Longwall Shield and Standing Gateroad Support Designs - Is Bigger Better?
  6/1/2007 - Conference papers
  There are fundamental aspects of support design and ground control that we still do not understand or recognize when designing a support system. These issues are evaluated and a different approach to support design is proposed.
• 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.