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Determining Horizontal Stress Direction Using The Stress Mapping Technique
By T. P. Mucho
Mine roof failure due to excessive horizontal stress has been recognized as a major cause of hazardous roof conditions in some mines. Stress measurements gathered by the U.S. Bureau of Mines (USBM) at
Jan 1, 1994
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Subsidence Prediction In Illinois Coal Basin
By Ed D. Doney
Based on the subsidence data collected through a comprehensive subsidence monitoring program con: ducted over two longwall panels in an Illinois coal mine, mathematical models have been proposed for p
Jan 1, 1990
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A Methodology for Fault Pre-Consolidation prior to Longwall Retreat: A Case Study from Kestrel Coal
By Dion Pastars
Kestrel Coal has undertaken a surface-to-seam consolidation program of faulted ground prior to longwall retreat in the 304 panel. Micro fine cement is used to improve the rock mass quality and the
Jan 1, 2007
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A Method for the Selection of Rock Support Based on Bolt Loading Measurements
By Stephen P. Signer
A method to assist in the evaluation and selection of roof bolts using in situ measurements of roof bolt loading has been developed by researchers of the Spokane Research Center, National Institute of
Jan 1, 1997
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Mine Roof Geology Information System (MRGIS)
By Syd Peng
It is necessary to fully understand roof geological features in order to design a proper roof support system for underground coal mines. These geological features include: rock type, rock strength. ro
Jan 1, 2003
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Geological Sensing - The Key To Increasing Miner Safety
By J. R. M. Hill
The U.S. Bureau of Mines is involved in research to improve geological sensing (or geo-sensing) techniques. This paper presents results from field trials of two research projects concerned with new te
Jan 1, 1992
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Failure Modes Of Mine Tunnels In Stratified Rock Structures With Reference To Stress Field Conditions
By Hui Chen
The paper describes the use of a physical model technique to investigate the failure modes of mine tunnels with reference to the in situ stress field. The characteristics of stratification commonly en
Jan 1, 1993
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Ground Control Criteria for Coal Reserve Optimization in Multiple-Seam Mines
By Eric Westman
Ground control problems caused by multiple-seam interaction frequently sterilize coal reserves. Interaction mechanisms differ for overmining and undermining and are controlled by mining, spatial. and
Jan 1, 1997
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A Review of the Geomechanics Aspects of a Double Fatality Coal Burst at Austar Colliery in NSW, Australia in April 2014
By Bruce Hebblewhite, Jim Galvin
"A coal burst occurred on 15 April, 2014 at the Austar Coal Mine, located west of Newcastle, NSW, Australia. The burst resulted in fatal injuries to two men working as part of the mining crew at the d
Jan 1, 2016
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New Design Criteria for Roof Bolt Systems
By John C. Stankus
From research started six years ago, a new design criteria has been developed for mine roof bolt systems This design criteria precisely and quantitatively determines parameters such as bolt length, in
Jan 1, 1997
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Stress And Stability In Coal Ribsides And Pillars
By A. H. PH. D Wilson
Compared to the rocks encountered in, say, metalliferous mining or tunnel drivage in igneous and metamorphic rocks, the strata associated with the coal measures are relatively soft. If excavations are
Jan 1, 1981
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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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Subsidence Over Room and Pillar Retreat Mining in a Low Coal Seam
By Andre Zingano, Anderson Weiss
"The objective of this paper is to study the behavior of a low thick and low depth coal seam and the overburden rock mass. The mining method is room and pillar in retreat and partial pillar recovery.
Jan 1, 2018
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Recent Innovations for Slope Development
By Tim Burgess
Patton Mining, LLC and J.H. Fletcher Company recently collaborated and mechanized the sometimes hazardous, and always labor intensive, process of installing standing steel supports during the construc
Jan 1, 2011
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Research Progress on Fully Mechanized Mining Technology of Steeply Dipping Seams
By Hongwei Wang, Hao Zhang, Panshi Xie, Xicai Gao, Youfu Zeng, Yongping Wu, Juan Dou
"The reserves and production of steep coal seams account for approximately 15–20% of the total coal reserves in China and 5–10% of the total annual coal production. More than 50% of the coal is high-q
Jan 1, 2017
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Design And Experience Of Total Extraction Room And Pillar Operations Above Depleted Longwall Panels
By Kenneth Rigsby
Black Mountain Resources' Highlands Mine No. I is a full extraction room and pillar operation located in Harlan County, Kentucky. Black Mountain extracts the 0.9 to 1.1 meter (36- to 42-inch) thi
Jan 1, 2003
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Case Study of Conditions Observed During the Removal of a Highly Fractured Roof Beam in Bedded Halite
By Liane J. Terrill
A 9O) ft (275 meter) section of a highly fractured beam of halite was mined from the roof of a supported thirteen year old drift at the Waste Isolation Pilot Plant (WIPP). The operation was conducted
Jan 1, 1997
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Moranbah North Tests the Critical Caving Theories Every Geotech Engineer?s Dream, the Ability to Get More than Two Points on a Curve
By Chris Strawson
Moranbah North is a modern longwall operation mining premium coking coal in the Northern Bowen Basin, Central Queensland. Australia Moranbah North Coal (MNC) is owned and operated by Anglo Coal Austr
Jan 1, 2007
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In Situ Strength Testing of Rocks with the Borehole Penetrometer
By Kot F. von Unrug
One of the major difficulties in the proper characterization of rocks surrounding excavations is the lack of data. The existing method for strength determination requires core drilling for sample coll
Jan 1, 1998
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Roklok Polyurethane Binder: A Chemical Injection System For The Consolidation Of Severe In-Mine Ground Conditions
By Kirk W. McCabe
RokLok binder is a two-component polyurethane system consisting of a polymeric isocyanate (Component A) and a polyol resin (Component B). The two chemicals are mixed and injected into the mine rock un
Jan 1, 1981