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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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Three-Seam Interaction: A Case Study
By N. P. Kripakov
Results of a complex three-seam interaction analysis in a western U.S. coal mine are presented. The physical situation simulated by the models represents the development of a set of entries underneath
Jan 1, 1996
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Multiple Seam Mining Feasibility in the Illinois Basin (USA): LaModel Stress Analysis Programs
By Rebecca Hardy
The escalating demand for coal, in addition to the steady depletion of reserves, has produced increasingly difficult mining conditions for coal mining companies within the United States, resulting in
Jan 1, 2006
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Pre-Driven Longwall Recovery Room Under Weak Roof Conditions ? Design, Evaluation, and Monitoring
By Peter (Yunqing) Zhang
Longwall recovery under weak roof conditions could have considerable delay if the immediate roof is weak and deteriorates during screening. A pre-driven longwall recovery room is a feasible solution
Jan 1, 2006
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Feasibility Study And Design Of A New Underground Coal Mine Developed From Open Cut Highwall In Indonesia (25d3d094-fa9d-4970-a166-6a4fe20badce)
By Takashi Sasaoka
About 200 M tons of coal were imported into Japan in 2007 and Indonesia was its second largest exporter, accounting for about 30 M tons (12% of the total imported coal). Indonesia produced about 200 M
Jan 1, 2009
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Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
By Gabriel Esterhuizen
Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage at stresses that are lower than one would otherwise expect. Th
Jan 1, 2007
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In-Situ Tests and Numerical Simulation about the Effect of Annulus Thickness on the Resin Mixture for Fully Grouted Resin Bolt
By Andre Zingano
The objective of this paper is to study the effect of annulus thickness on the quality of resin mixture for fully grouted resin bolt. Pullout and mixture tests were made in underground coal mines for
Jan 1, 2008
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Designing Free-Standing Steel Supports for Coal Mine Roof Support
By Sam Spearing
Free-standing supports are commonly used in coal mines in the USA, particularly when longwalling. A recent trend has been the development of prop supports. Prop supports have many advantages over bu
Jan 1, 2008
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Application of Chain Conveyor Cutter (Ccc) to Highwall Mininig System
By Takashi Sasaoka
Chain Conveyor Cutter (CCC) is a chainsaw-type machine and originally developed for the construction of underground walls and/or ground improvements. CCC was developed from the accumulated technology
Jan 1, 2012
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Field Monitoring of Rock Bolting Performance in Weak Roof Strata
By Tingkan Lu
To understand the reinforcing mechanisms of the fully grouted resin bolt and clarify its performance in weak roof strata, the field monitoring investigation using instrumented bolts has been conducted
Jan 1, 1998
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Towards a Real Time Response to Changing Strata Conditions on a Longwall
By P. Trueman
A project is underway to convert a validated methodology to a system that will permit the near real time interpretation of loading data from longwall powered supports, allowing rapid adaptation of min
Jan 1, 2006
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The Design And Selection Of Powered Supports For Application In 4.5 Metre Extraction At Daw Mill Colliery
By Clive Chadbourne
Investigations of world wide coal face strata control practice, the study of theoretical calculations and detailed engineering analysis have been combined to design and select a powered roof support s
Jan 1, 1994
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Development and Field Tests of Look-Ahead Radar and Horizon Sensing for Coal Cutting Drums
By Gerald L. Stolarczyk
Safe and efficient coal extraction requires advanced radar subsystems that can be mounted on cutting drums of coal cutting machines. A look-ahead radar (LAR) must solve the radio geophysics problem o
Jan 1, 2006
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A Case History of the Effect of Mine Subsidence on a Concrete Arch Bridge in Northern West Virginia
By R. B. Alke
Request to Mine Beneath Bridge The Jabs Run Bridge is a reinforced portland concrete arch filled bridge located on WV Bouts 7 near Pentress, WV. The bridge has a span of 22.9 m (meters) and a height o
Jan 1, 1984
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Control of Hard-to-Collapse Massive Roofs in Longwall Faces Using a Hydraulic Fracturing Technique
By Hideki Shimando
Periodic weighting and windblast which are caused by the dynamic effects of overburden in a longwall panel significantly affect longwall mining This study describes past experience with wind blast
Jan 1, 1998
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Cost Preventive System To Control Unstable Roof In Main Line Haulage Entries
By John Popovich
The MICON RokLok binder system including component and consolidation processes and safety and its first aide are described. The implementation procedures and selection of injection parameters are disc
Jan 1, 2001
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Pillar Design Issues For Underground Stone Mines (5c6602ba-4b85-4ec3-ad15-c1c321c1afcd)
By A. T. Iannacchione
Underground stone mining represents an emerging sector for the U.S. mining industry. As this expansion takes mines under deeper cover and as more efficient mining methods are utilized, adequate stone
Jan 1, 1999
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Longwall Support Monitoring
By Robert G. Harris
During the last five years there have been significant improvements in face support monitoring techniques particularly in respect of face pressure. The measurement of support loading pressures was
Jan 1, 1993
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Development of in-situ stress measurement technique using ultrasonic wave attenuation method - A progress report
By Y. L. Sun
The feasibility of using the ultrasonic wave attenuation method for measuring in-situ stress is examined theoretically and experimentally. The theoretical analyses show that for a given rock type the
Jan 1, 1989
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Drainage Of Water From Abandoned Mines By Horizontal Drilling
By Alan J. Zeni
Drainage of water from abandoned underground mines has become important in recent years because of safety concerns when mining near abandoned works or reentering abandoned mines for further developmen
Jan 1, 1990