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A Statistical Overview of Retreat Mining of Coal Pillars in the United States
By Christopher Mark
The demographics and safety record of the pillar retreat segment of the U.S. coal industry was analyzed using statistics collected by the Mine Safety and Health Administration. Pillar recovery is prac
Jan 1, 1997
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The Response Of Massive Structures Inferred From Tidal Tilt Monitoring (a922d488-04e7-4665-bcdd-a85115c8db5e)
At any given lime, the tidal force subjects massive regions to a spatially uniform load. The deformation of any large structure due to these forces is proportional to the elastic properties of the str
Jan 1, 1992
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Shear Bond Stresses Along Cable Bolts
By Hani S. Mitri
The behaviour of grouted cable bolts used for rock reinforcement as a means of ground control in hard rock mining is investigated. The study utilizes an analytical model which is based on the variatio
Jan 1, 1990
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A Study of Periodic Weighting of Longwall Supports
By Archie Richardson
Periodic weighting of longwall supports occurs during retreat ofthe face under certain geologic conditions. Strong stratain the immediate and main roof tend to cantilever over the gob, weighting the s
Jan 1, 1998
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Case Studies Using Mine-Wide Monitoring Systems For Geotechnical Evaluations
By John P. Dunford
U.S. Bureau of Mines researchers are investigating the ability of mine-wide monitoring systems already in place at many coal operations to provide a direct link between geotechnical instruments and th
Jan 1, 1993
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Prediction Of Longwall Support Loading At Southern Colliery, Queensland (a27f315c-1e91-4c85-b61a-2de1eb8e0d0f)
Roof conditions at Southern Colliery, the second Iongwall mine to be established at German Creek, were found to be much stronger and more massive than at the earlier longwall mine on the lease. Invest
Jan 1, 1992
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A New Rockbolt Axial Load Measuring Device
By Hani Mitri
A new monitoring device called SAFEBOLT (Stress And Force Evaluator in Bolts) has been recently developed. The device SAFEBOLT, essentially replaces the load cell, it permits the monitoring of bolt a
Jan 1, 2001
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New Tools For Roof Support Evaluation And Design (64c31d00-3878-45a5-a962-d673afed7598)
By Steve Signer
Researchers at the National Institute for Occupational Safety and Health (NIOSH) have developed several new tools for evaluating roof support performance. A miniature data acquisition system (MIDAS) w
Jan 1, 2003
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A Study Of Floor Heave In The Mines Of The Southern Coalfield Of New South Wales By Two Dimensional Finite Element Modelling
By A. K. Bhattacharyya
The excessive displacement of the seam floor in headings (i.e. roadways) called 'floor-heave' is often experienced in the underground mines of the Southern Coalfield of New South Wales. Apar
Jan 1, 1992
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A Simple Finite Element Model For Predicting The Behaviour Of Hydraulically Powered Coalmine Supports
By Brian G. D. Smart
A scheme is presented whereby the complexities of design and operation of a hydraulically powered coalmine support are modelled using the finite element method. This enables predictions to be made of
Jan 1, 1992
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Leached Salt Cavern Design Using a Fracture Criterion for Rock Salt (81ddea75-bb8e-4c9d-8bc7-d9299dc4873e)
By Dale S. Preece
In 1975 Congress passed the Energy Conservation Act to establish a U. S. Strategic Petroleum Reserve (SPR) with a capacity of 750 million barrels of crude oil. The most economic storage medium was det
Jan 1, 1984
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Development Of A Slope Stability Program For Improved Quarry Design
By John Bullock
Limestone and dolomite quarries were mapped to determine specific failure mechanisms for the various geologic and structural conditions. Algorithms for analyzing these mechanisms were incorporated int
Jan 1, 1993
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Why Dead Load Suspension Design for Roadway Roof Support Is Fundamentally Flawed Within a Pro?Active Strata Management System
By Russell C. Frith
Risk-based roadway roof support design is now a critical part of the Australian Coal Industry. Safe and efficient mining demands that roof support be tailored to the prevailing geotechnical conditions
Jan 1, 2011
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Ground Control Technology for Mass Exploitation of Coal Deposits with Continuous Miner: A Review of the Indian Scenario
By Sanjay Kumar Singh
This paper presents ground control technology associated with a continuous mining operation for mass exploitation of underground coal deposits in the Indian coal mining Industry It shows that competen
Jan 1, 2011
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Design, Construction And Performance Of A Single Pass Lining For Soft Ground Coal Mine Tunnel Entries
By Donald P. Richards
West Elk Coal Company operates its Mt. Gunnison No. I mine on the western slope of the Rocky Mountains in Western Colorado. The mine is located along the north fork of the Gunnisson River near Somerse
Jan 1, 1984
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Development Of A Statistical Technique For Assessing Sandstone Escarpment Stability
By Hamid Maleki
During the last decade, a significant amount of research has been conducted by Energy West Mining Company, government agencies, academia, and consulting companies to develop predictive tools for asses
Jan 1, 2000
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A Possible Alternative To Hardwood Chock Pieces
By B. G. D. Smart
The development of a softwood alternative to the hardwood chockpiece used to build the waste-edge breakers commonly incorporated in gateroad packs is described. The results of laboratory tests on soft
Jan 1, 1992
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Load Transfer Mechanics In Fully-Grouted Roof Bolts
By Maynard O. Serbousek
The mechanics of load transfer of fully-grouted roof bolts in coal mines has been investigated in laboratory and analytical studies. The purpose of this research is to increase the understanding and b
Jan 1, 1984
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Application of Yieldable and Cuttable Pump Crib in Longwall Recovery Room
By Quanzhong Gu
Stability of a pre-exnacted recovery room plays a vital role when longwall face approaches and during a longwall face move. In an attempt to extend the application of pumpable cribs into recovery room
Jan 1, 2004
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Massive Pillar Failure--Two Case Studies
By David H. Tang
Similar massive pillar failures were observed in two underground coal mines with different configurations of mine workings and overburden depths. Finite element models were used to analyze the causes
Jan 1, 1984