Results 31 - 40 of 46

• Forecasting Roof Falls with Monitoring Technologies - A Look at the Moonee Colliery Experience
  8/1/2005 - Conference papers
  Monitoring technology and techniques can provide a means to warn of hazardous roof fall conditions. Measuring roof deflection is the most common method of detecting roof instabilities.
• Characteristics of Mining-Induced Seismicity Associated with Roof Falls and Roof Caving Events
  6/1/2005 - Conference papers
  This study used microseismic emissions to help identify three local rock failure processes. It was also shown that analysis of microseismic emissions can aid in assessing the degree of instability associated with these local rock failure processes.
• Mapping Hazards with Microseismic Technology to Anticipate Roof Falls - A Case Study
  8/1/2004 - Conference papers
  More that 700 microseismic emissions were collected from two underground limestone mine roof fall areas in southwestern PA. Results reveal much about the behavior of strata prone to failure and allow for the construction of hazard maps.
• The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls
  2/1/2004 - Conference papers
  This paper examines the capabilities of convergence and microseismic monitoring systems to better understand roof rock failure mechanics and anticipate falls. Understanding these techniques is critical in developing effective ground control strategy.
• Seismic Event Data Acquisition and Processing: Distribution and Coordination Across PC-Based Networks
  2/1/2002 - Conference papers
  NIOSH has developed an automated PC-based seismic event (induced earthquake) monitoring system for use in mine ground control studies. This paper describes system design philosophy, hardware/software components, installation examples, and results.
• Development of an Automated PC-Network-Based Seismic Monitoring System
  12/1/2001 - Conference papers
  An automated PC-network-based seismic data acquisition and processing system has been developed by NIOSH for use in mine safety studies. Several systems have been constructed and deployed in the field for testing and application. These systems are now b...
• An Analysis of Rock Failure Around a Deep Longwall Using Microseismics
  8/1/2001 - Conference papers
  A state-of-the-art, three-dimensional, full waveform, microseismic system was used to analyze the rock failure around a deep bump-prone longwall panel. Analysis of the recorded events is discussed.
• A Correlation Between Seismic Tomography, Seismic Events and Support Pressure
  7/1/2001 - Conference papers
  To study bump mechanisms, conditions in the vicinity of a deep longwall mining face in bump-prone strata were monitored using three discrete systems in an effort to increase understanding of mining-induced stress redistribution and bump potential.
• Differential Wall Rock Movements Associated with Rock Bursts, Lucky Friday Mine, Coeur d'Alene Mining District, Idaho, USA
  6/1/1999 - Conference papers
  Various methods of monitoring slip movements on bedding planes, as well as examination of rock burst damage in stopes, suggests that rock bursts in the Lucky Friday Miner are closely associated with these movements.
• Rock Bursting and Seismicity During Ramp Development, Lucky Friday Mine, Mullan, Idaho
  8/1/1998 - Conference papers
  A comprehensive survey of mine seismicity a rock bursting during development of two sublevels at the Lucky Friday Mine, Mullan, ID, was conducted to better define rock failure mechanisms and sources of ground control hazards.