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Influence Of Discontinuity Orientations And Strength On Cavability In A Confined Environment
By L. J. Lorig
Much of the present knowledge about caving behavior of rock masses has been obtained from empirical observations. Additional notions about caving have been developed through inferences derived from tw
Jan 1, 1989
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Effect of Roof Convergence on Stability of Underground Mine Seal Subjected to Explosion loading - Numerical Approach
By Rajagopala Reddy Kallu
After the Sago and Darby No. 1 mine incidents, the new regulatory standards for the design of mine seals in underground coal mines of the United States require the mine seals to withstand higher explo
Jan 1, 2007
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Assessment and Mitigation of Subsidence Effects on a Tall Self-Supporting and Free-Standing Communication Tower
By Yi Luo
A longwall mining operation went under a tall, self-supporting and free-standing wireless communication transmission tower. In anticipation of that the ground subsidence process might affect the trans
Jan 1, 2008
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A Simple Method Of Measuring Rock Fracture Toughness Using The Brazilian Test Method
By H. Guo
There are a number of methods available for the determination of the fracture toughness of rock. Some of the most recognised methods include the hollow pressured cylinder, the short-rod, the chevron -
Jan 1, 1992
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Recent Trends of Coal and Gas Outburst Accidents in China
By Ming Ju Liu
China has been suffering from the most serious coal and gas outburst accidents. The situation has become worse than ever with the mining of deeper coal seams at higher production rates in a more compl
Jan 1, 2008
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Sub-Surface Ground Movements Associated With Longwall Mining
By P. Gaskell
The paper examines the development of rock movement between a longwall extraction horizon and the surface for a fully caved mining situation. Physical modelling has been used to examine the mechanics
Jan 1, 1988
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Is Mining Coal at a 900M Below Surface at the Xuandong Coal Mine in China Challenging or Just Interesting Rock Mechanics?
By Wouter Hartman
Xuandong Coal Mine is mining coal in one of the most challenging underground environments in the world. This work has found that it is not only challenging but it also has the composition for some int
Jan 1, 2012
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Effects of In-seam and Near-seam Conditions and Asymmetric Pillar Loading on Coal Pillar Strength
By Daniel W. H. Su
The importance of incorporating fundamental principles of rock material response and failure mechanics into a pillar strength design model has been demonstrated. To accurately assess pillar strength,
Jan 1, 1997
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STRATA III ? A Full-Spectrum Roof Control Concept
By John H. Perry
Strata III is a full-spectrum roof control system which provides the mine operator the ability to upgrade his roof control in place. The procedure is easily adaptable with current roof bolting techniq
Jan 1, 1987
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Complex Seismic Trace Attributes In Coal Exploration
By Lawrence M. Gochioco
The interpretation of coal seismic data requires a certain precision and accuracy to make the results more reliable. The signature of the seismic wavelet provides a host of valuable geologic informati
Jan 1, 1989
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Gate Entry Design For Longwalls Using The Coal Mine Roof Rating
By Chris Mark
Successful longwall mining requires a stable tailgate entry. Gate entry performance is influenced by a number of geotechnical and design factors, including: - Pillar size and pillar loading; - Ro
Jan 1, 1993
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Effect of the Interchamber Pi Yield on the Surface Strains in the Movement Trough Edges
By Mikhail P. Nesterov
The paper presents the results of the research that can forecast the development of subsidences and deformations of the earth surface with time in the permanent marginal areas of the movement troughs
Jan 1, 1997
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Calcium Aluminate Kiders in Hard Rock and Coal Mining
By Bernard Woolley
The history of the use of calcium aluminates in mining is discussed including a review of very rapid hardening concretes, anchoring using cement capsules and pumped ground control systems. Specific re
Jan 1, 1997
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Investigation of Some Alternatives to Timber Posts and Cribs
By Gavin J. Faulkner
This paper presents an investigation of some alternatives, and improvements to timber posts and cribs. The purpose is to find a cheaper, better, easy to install, and effective means to replace or impr
Jan 1, 1986
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Changes In The Seismic Properties Of The Cover Produced By Longwall Mining
By Guoqi He
Common offset seismic data collected over two active longwall panels at different stages of mining reveal that significant arrival time delays are produced in reflections from different levels within
Jan 1, 1989
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Application of Neuro?Fuzzy Technique in Mine Support System for Ground Control
By Sudhir Kumar Kashyap
In underground activities ground control is a challenging problem. It affects safety, production, and efficiency. As per statistics of accident data, ?fall of roof/sides? is one of the major causes of
Jan 1, 2012
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Detection of Abandoned Mines and Air Passages/Burning Centers of Mine Fires by Combined Electromagnetic Method
By Shu Yan
The high resolution resistivity method (HRRM) is developed specifically for detecting underground cavities and tunnels. HRRM has a special feature in that it can recognize and cancel static shift, whi
Jan 1, 2005
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Design And Backfill Installation Considerations For Cut-And-Cover Coal Mine Slope Entry Using Steel Supports And Lagging (5aeac579-3675-40a9-b37e-6b4c5af947be)
By Larry DeGraff
With the increase of new mine development in the past several years, many coal mines have decided to self- perform the design and construction for their slope development projects. The development pr
Jan 1, 2009
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Rib Support Innovation At Daw Mill Colliery (a22a0861-1502-4d3d-a2cd-8a6ba0c13271)
By Jon Bowler
Daw Mill Colliery, UK Coal, near Coventry in England, mines the Warwickshire Thick Seam at 800 m/2500 ft depth using longwall retreat with gateroads supported by rockbolts. Over the last eight years
Jan 1, 2009
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Development of Mains in Challenging Ground Conditions
By Kot F. v. Unrug
The present combination of coal market prices and reserves, situated in the Central Appalachian Coal Field, is such that mining of smaller coal reserve blocks has become economically attractive. In
Jan 1, 2006