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Classification Of Large Seismic Events At The Lucky Friday Mine
By J. K. Whyatt
The paper presents an approach to design a multi level room and pillar layout in a 40m thick seam overlain by a major aquifer. The design was required to maximise extraction with due consideration of
Jan 1, 1996
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Potential Of A Void Diffusion Model To Predict Longwall Subsidence In The Illinois Coal Basin
In this paper, the authors attempt to apply a simplified non-homogeneous void diffusion model (NHVDM) to predict surface subsidence for longwall mining in Illinois. A generalized error function subsid
Jan 1, 1990
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An Application Of Energy Release Rate
By Morgan M. Sears
In recent years, one large mine collapse and numerous smaller bump events have resulted in a renewed interest in coal bump research. With numerical modeling, the Energy Release Rate (ERR) calculation
Jan 1, 2009
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Advanced Development of the Radio Imaging Methods
By Gerald Stolarczyk
The Radio Imaging Method (RIM) is based upon electromagnetic (EM) wave propagation in the coal seam waveguide. The radio geophysics theory underlying RIM was developed by Hill of the national Institu
Jan 1, 2006
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The Effect Of Gas Pressure On Coal Strength
By Najdat I. Aziz
There are different schools of thoughts about the influence of gas pressure on coal strength. Researchers have reached contradictory results with regard to the effect of confining gas pressure on tens
Jan 1, 1996
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Comparative Studies In The Mechanics Of Grouted Roof Bolts
By Stephen P. Signer
To improve the understanding of the support interaction mechanics between grouted bolts and coal mine roofs and to help lay the foundations for improved design and evaluation techniques, the 0.8. Bure
Jan 1, 1988
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Cavability Study Of A Competent Roof - A Case Study
By T. N. Singh
An evaluation was made on the cavability of the roof formation of Dishergarh seam including caving sequence, caving span, and load on powered support.
Jan 1, 1994
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Surface Fracture Development From Mine Subsidence In Eastern Kentucky
By Clyde DeRossett
Surface fractures, sometimes of significant size, are observed in eastern Kentucky over high extraction areas. Field observations were correlated with mine maps and a regional subsidence prediction co
Jan 1, 1993
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An Integrated Approach To Subsidence Modelling And Prediction In The Collie Coal Basin (Western Australia)
By Ian Misich
A research programme has been undertaken to evaluate and predict the effect of total extraction of coal by underground methods on the superimposed strata, aquifer systems and ground surface in the Col
Jan 1, 1993
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Control Of Roadway Closure In Underground Coal Mines By Sidewall Weakening Technique
One of the problems associated with the maintenance of roadways in underground coal mines is that of dealing with roadway closure. Sidewall weakening technique is based on the transference of the h
Jan 1, 1990
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Mine Pillar Stability Analysis Using Fem Methods - Two Case Studies
By David H. Tang
Massive pillar failures were observed at two underground coal mines. The results of stability analysis using traditional pillar design formulae did not agree with the underground observations. Finite
Jan 1, 1990
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Truss Systems For Longwall Tailgate Support - Update
By John C. Stankus
At the 13th Conference on Ground Control in Mining, a paper was presented detailing a successful test in which a new truss system was utilized, in lieu of wood cribs, for tailgate support in the Pitts
Jan 1, 1995
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Application Of Short-Term Time-Dependent Plate Loading Tests For Estimation Of In-Situ Elastic And Viscous Parameters Of Weak Floor Strata
By Gang Chen
This paper explores the possibility of using short-term time-dependent plate loading tests to estimate the elastic and viscoelastic parameters of the weak floor strata typically associated with coal s
Jan 1, 1990
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Convergence And Load Measurements In An Underground Mine In [Türk±ye]
By A. G. Pasamehmetoglu
This paper describes the conver¬gence and load measurements carried out in inclined seams at five longwall faces, two of which were supported by hydraulic props and the other three by conventional tim
Jan 1, 1992
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A Study On Stress Distribution And Reasonable Size Of Coal Pillar In A Coal Face
By H. C. Li
Mechanical models are established in accordance with the degree of mining on both sides of the coal pillar, and formulae were derived which calculated the superposition stress distribution and the wid
Jan 1, 1992
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Ground Movements Associated With Pillar Extraction Coal Mining In Northern West Virginia (38f818ad-9d3b-4ecb-b624-667cef121309)
By Robert W. Bruhn
An investigation was male of ground response to pillar retreat mining in a 1.7 meter thick seam at 108 meter depth at a site in northern West Virginia. This paper describes mining-related stress chang
Jan 1, 1984
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Rapid Assessment Of Gateroad Roof Stability By Simple Monitoring Techniques
By Peter Cain
In response to the appearance of excessive convergence of bolted gateroads in the front abutment zone of retreating coal faces at Phalen Colliery, staff from the CANMET Cape Breton Coal Research Labor
Jan 1, 1996
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Underground Storage, With Emphasis On Storage In Excavated Rock Caverns
By C. Fairhurst
Most of the papers designated as being within the topic of underground storage at this Symposium are concerned with aspects of radioactive waste isolation. Although this is, unquestionably, an importa
Jan 1, 1989
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Improved Source Location And Evaluation Of Seismic Events Over A Deep Coal Mine
By D. S. Choi
This paper describes an improved source location technique for microseismic events related to coal mining. A system of non- linear distance equations is solved with the use of the Newton-Raphson metho
Jan 1, 1990
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Prediction of surface movement with emphasis on horizontal deformation due to mining
By Mao Bai
In predicting the integrity of under-mined structures, surface horizontal displacements and curvatures are frequently of greater importance than the more homogeneous vertical displacements. Accurate e
Jan 1, 1989