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Options to Control Groundwater-Based Georisks along Geological Faults in the Large Scale Area of Influence of an Open Pit Mine
By Markus Papst, Denise Millier, Daniel Beckers, Axel Preusse
"At an open-pit lignite extraction mine in Germany, groundwater has to be pumped over a large area, which leads to subsidence at the surface. As long as the geology of the area of influence is homogen
Jan 1, 2016
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Comparative Analysis Of Longwall Gateroad Designs In Four Deep, Bump-Prone Western U.S. Coal Mines
By Matthew J. DeMarco
Research personnel at the U.S. Bureau of Mines have conducted longwall gate stability studies at four western U.S. mines attempting to employ yield pillars for improved ground conditions. Located in t
Jan 1, 1993
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Improved Design Of Coal Pillars For U.S. Mining Conditions
By Z. T. Bieniawski
This paper presents the results of a survey of room and pillar dimensions and design practice in U.S. coal mines aimed at improving the design procedures in room and pillar mining. A review is given o
Jan 1, 1981
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Anchorage Pull Testing for Fully Grouted Roof Bolts
By Chris Mark
Fully-grouted roof bolts comprise more than 80% of the primary roof supports used in U.S. coal mines. However, nearly 1,500 MSHA reportable, non-injury roof falls occur each year, and most of these ar
Jan 1, 2002
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Innovative Rock Reinforcement Hardware (a5497235-47bd-4c2e-8654-b4e79927169e)
By D. F. Howarth
Two innovative ground reinforcement products have been developed for use in the mining industry. One of these products is a high strength polyethylene (HOPE) bar for use as a rib bolt in underground c
Jan 1, 1992
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The NIOSH Shield Hydraulics Inspection and Evaluation of Leg Data (Shield) Computer Program (7f22bea3-620b-4bd0-a4b9-04ee2b01eea7)
By Thomas Barczak
Longwall shields provide essential ground control in Iongwall mining, yet a high percentage of shields are operating at less than peak capacity and many at well below the rated support capacity due to
Jan 1, 2002
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The Influence Of Stream Valleys On Coal Mine Ground Control
By John L. Hill
Over 50 mines of the Appalachian and Illinois Basins are presently experiencing poor ground conditions believed to be caused by overlying stream valleys. The Bureau of Mines is conducting research int
Jan 1, 1988
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Development of A Yielding Steel Post
By John P. Dunford
Ground support continues to be the most important safety consideration in underground mining. The Bureau of Mines has developed a yielding steel post with a capacity of 45 tons and b c1osure allowance
Jan 1, 1986
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An Application Of Tree Classification Method In Analysis Of Longwall Shield Stability
By Yong-Ming Jiang
Longwall mining systems are extremely complex and expensive and require great caution for reliable and efficient operation. In many cases, ground control problems are the primary concern in longwall m
Jan 1, 1993
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An Integrated Approach to the Monitoring and Modeling of Ground Movements
By A. Chrzanowski
The integrated approach to monitoring surveys is based on a simultaneous utilization of geodetic, photogrammetric and geotechnical measurements of displacements, tilts, strains and any other geometric
Jan 1, 1984
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Monitoring Of Longwall Seal Behaviour For Permeability And Stress Changes
By Ken Mills
Dartbrook Mine (Australia) works the Wynn seam, which has a moderate propensity for spontaneous combustion. Prior to any mining a commitment was made to place a segregation barrier pillar between long
Jan 1, 1999
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Geotechnical Planning Basis for the Optimization of Workings
By Nikolaos Polysos
Besides considering the given geomechanical conditions, the geological/geotechnical logging of drill cores and heading faces during the driving of parallel entries and the resulting rock classificatio
Jan 1, 2003
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Weatherability Test of Rocks for Underground Mines
By Kot F. Unrug
The shale response to moisture changes and the major finding of the appropriate research concerning this subject are briefly reported in this paper. Also described are mine ambient atmospheric condit
Jan 1, 1997
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Control Of Mine Subsidence Utilizing Coal Ash As A Backfill Material
By D. W. Evans
Mine subsidence problems due to coal extraction have occurred in a number of areas throughout the United States. Depending on the local geology, the depth of the mined seam, the type of mining method
Jan 1, 1982
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Tunnel Deformation Monitoring "Action Levels" In Coal Mines For Support/Reinforcement Design
By Lorraine Kent
Mine tunnel support using rockbolts was introduced in UK coal mines over the period 1987- 1992 and is now used in over 70% of all mine tunnels. In every case the reinforcement design has been based on
Jan 1, 1999
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Time Dependent Mining Induced Subsidence Measured by Differential Interferometric Synthetic Aperture Radar
By Jessica M. Wempen
Differential Interferometric Synthetic Aperture Radar (DInSAR), a satellite-based remote sensing technique, has been demonstrated as a potentially practical method for measuring mining induced surface
Jan 1, 2014
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Optimizing Secondary Roof Support With The NIOSH Support Technology Optimization Program (STOP) (9d51b6a2-7ba0-4aba-9b0e-5647ea8b90eb)
By Thomas M. Barczak
The decade of the 90's brought an unprecedented increase in the development of innovative technologies to provide more effective and easier to install roof support in underground mines. To facili
Jan 1, 2000
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Using The Point Load Test To Determine The Uniaxial Compressive Strength Of Coal Measure Rock (993fe9c2-59a0-4335-9e4c-58da9811402f)
By John A. Rusnak
Point load testing is used to determine rock strength indexes in geotechnical practice. The point load test apparatus and procedure enables economical testing of core or lump rock samples in either a
Jan 1, 2000
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Rigid Or Yielding Roof Bolts: At The Face Or Away From The Face (3eff2ffb-d0b3-4171-9439-10f9fdec54f7)
By R. D. Lama
The concept of rigid or yielding bolts is discussed based upon support requirements for excavations of equivalent geomechanical behaviour. The concept of equivalent geomechanical behaviour is introduc
Jan 1, 1992
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Mine-Wide Physical Property Trend Identification Using Portable Onsite Test Devices
By Thomas L. Vandergrift
The type and severity of coal mine entry failures are affected by the strength and stiffness properties of the roof, floor, end coal. Knowledge of the mine-wide trends of these properties Is valuable
Jan 1, 1990