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Study Of The Impact Of Mining Under Massive Roof At Datong Coal Mines, China (7e96e5f6-0b09-4bad-866d-2ffcd02d33be)
By Song Yong Jin
The Jurassic coals at Datong are characterised by their strong, massive sandstone and conglomerate roofs which fail suddenly over large areas, crushing pillars and creating destructive windblasts, col
Jan 1, 1992
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Determination Of The Rock Strength From Portable Rock Tester
By K. F. Unrug
A new testing technique for the determination of the rock strength from portable rock tester is proposed. It is a quick and economical method that can determine the rock strength with reasonable accur
Jan 1, 1990
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Evaluation Of Measurement System For Monitoring The Stability Of Roof Bolted Roadways With Rectangular Cross Section By Selected Examples
By Axel Preusse
To detect improper deformations of a roof bolted roadway in order to reduce inner mine damages in the most early stage and to initiate suitable countermeasures if necessary, several different measurem
Jan 1, 2000
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Development Of Stress Measurement Techniques In Bump-Prone Coal For Safety Decisions
By Eric G. Zahl
Researchers at the Spokane Research Laboratory of the National institute for Occupational Safety and health are evaluating stress and displacement measurements in a longwall coal mine. The objective i
Jan 1, 2000
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Implementation and Evaluation of Roof Bolting in MICARE Mine II
By Gustavo Herrera Rico
As part of a general effort to increase safety, efficiency, and profitability of its mining operations, MICARE personnel with the support of NorWest Mine Services, Inc. determined that the key to impr
Jan 1, 1997
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Practical Detection Of Underground Mine Roof Failure
By David Bigby
The paper describes research undertaken on an ECSC/K HSE project which investigated several potential physical principles which might be harnessed to provide a non-intrusive means of determining the e
Jan 1, 2004
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Monitoring Railroad Response To Mining Subsidence And Assessment Of Subsidence Effects On On Railroad - A Case Study
By Yi Luo
The responses of a section of railroad to ground subsidence process was monitored as it was undermined by a longwall panel. The subsidence data collected and the observations made through this monitor
Jan 1, 1994
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Recent Developments In Subsidence Prediction And Control For The Eastern U.S. Coalfields
By M. Karmis
Underground mining will disturb the natural equilibrium of the rock mass, causing significant stress redistributions in the vicinity of the excavation with corresponding horizontal and vertical displa
Jan 1, 1984
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Drivage System In Retreat Longwall Gateroad
By Kikuo Matsui
In a difficult economic environment, the coal mines in Japan have been making extensive efforts in order to survive by rationalizing the mining operations. Introduction of a new longwall mining system
Jan 1, 1995
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An Underground Trial Of Cable Slings For Remedial Support Of Longwall Gateroads
By William D. Gallant
This paper describes a joint cooperative project between the CANMET Cape Breton Coal Research Laboratory and the Cape Breton Development Corporation to conduct a trial of split set cable slings for re
Jan 1, 1990
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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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Design and Field Testing of a Mobile Roof Support for Retreat Mining,
By Robert R. Thompson
Retreat pillar mining is highly productive but dangerous. The primary danger during pillar removal is premature caving of the roof. Because the safety of the miners is dependent on successfully contro
Jan 1, 1986
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Early Warning of Longwall Weighting Events and Roof Cavities Using Lva Software
By David I. Hoyer
It is shown that by monitoring longwall leg pressures in real time, warning can be given for significant weighting events and the formation of roof instabilities, such as roof cavities, several hours
Jan 1, 2011
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The Use of NDT Methods to Determine the Condition of Rockbolt Support During the Recovery of a Previously Flooded Coal Mine Roadway at Thoresby Colliery
By Brian Clifford
Thoresby Colliery is in the process of recovering an old roadway that was flooded following the closure of an adjacent mine. The aim is to re-use the roadway as a gate road for a longwall retreat pane
Jan 1, 2002
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Finite Element Modeling Of Subsidence Induced By Underground Coal Mining: The Influence Of Material Nonlinearity And Shearing Along Existing Planes Of Weakness
By Daniel W. H. Su
Surface subsidence induced by multiple-panel coal extraction was calculated with finite element stress analysis. The use of nonlinear material behavior and GAP elements, which provide a realistic repr
Jan 1, 1990
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Mining Under Rivers In Fuxin Coal Mines
By Liang Yin-Huai
In Fuxin Coal Mines, there are more than 20 million tons of coal buried under seasonal streams. The coal seams are mostly shallow. We have mined more then 50 mining blocks distributed in 5 coal mines.
Jan 1, 1990
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State Of The Art Testing Of Powered Roof Supports
By Robert C. Garson
The Mine Roof Simulator at the DOE'S Mining Equipment Test Facility is described. Its use in the research and development on the behavior and response of longwall roof supports to simulated mine
Jan 1, 1982
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Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings
By Lisa Burke
In underground coal mines, concrete block stoppings are widely used to control mine ventilation. Although stoppings are not intended as roof support, they are subjected to roof to floor convergence, a
Jan 1, 2004
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Monitoring For The Evaluation Of The Stability Of Underground Openings
By P. K. Kaiser
The purpose of deformation monitoring for the evaluation of the stability of underground openings is reviewed briefly and some results from laboratory tests of small tunnels are presented. The ground
Jan 1, 1981
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Subsurface Fracture Development Due To Longwall Mining And Its Interpretation Using Image Processing Techniques (736b40e1-a21a-40c0-a678-75088df69d02)
By Gexin Sun
This paper presents the physical modelling results of subsurface fracture development associated with longwall mining operations and an application of image processing techniques to interpretion of th
Jan 1, 1992