Results 461 - 470 of 646

• Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
  7/1/2001 - Conference papers
  A system was developed to monitor rock and coal stresses during mining of an entire longwall panel. The system was designed to generate data in near real time to evaluate rock behavior in roof strata and the onset of hazardous conditions as overburden s...
• Geomechanics of Large Stone Structures: A Case History From the Washington National Cathedral
  7/1/2001 - Conference papers
  When the Washington National Cathedral showed signs of continuing differential settlement in the early 1990s, the U.S. Bureau of Mines was asked for assistance in monitoring the massive towers. This paper discusses the major findings of the study.
• 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.
• A Method for Modeling Variation of In Situ Stress Related to Lithology
  7/1/2001 - Conference papers
  Assuring ground control safety in many mining and tunneling projects depends, at least in part, on an understanding of in situ stress conditions that will be encountered.
• Case Studies of Cable Bolts Using Instrumented King Wires
  7/1/2001 - Conference papers
  Instrumented cable bolts were used in conjunction with existing ground control to monitor rock mass loads at various field sites. By monitoring rock mass load and displacement, more effective ground support can be selected and installed.
• Evaluation of the Bagged Stone Dust Barrier Effectiveness in a Bord and Pillar Mine
  6/1/2001 - Conference papers
  A project to evaluate the South African bagged stone dust explosion barrier was successfully completed at the NIOSH Lake Lynn Experimental Mine.
• Laboratory Testing To Quantify Dust Entrainment During Shield Advance
  6/1/2001 - Conference papers
  A series of controlled laboratory tests were conducted in a test stand simulating shield dust entrainment to evaluate changes in airborne respirable dust levels at different air velocities.
• Verification and Validation of Roof Bolter Simulation Models for Studying Events Between a Machine and its Operator
  6/1/2001 - Conference papers
  This paper presents the results of a study to verify and validate a computer model that represents and analyzes motions and hazardous events in a simulated three-dimensional workplace. The purpose of the computer model is to support research that is in...
• Noise Exposure in Longwall Mining and Engineering Controls Research
  6/1/2001 - Conference papers
  This paper presents a general review by NIOSH researchers of noise induced hearing loss (NIHL), the status of NIHL in mining, the results of the longwall noise surveys, and a review of the longwall engineering controls research efforts.
• CFD Modeling of Smoke Reversal
  6/1/2001 - Conference papers
  In the present study, a computational fluid dynamics (CFD) program is used as a design tool to model floor-level fires in a ventilated tunnel.