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A Case Study of a Low Overburden Longwall Recovery with Pre?Developed Recovery Entries
By John C. Stankus
The 3 Right pre-developed longwall recovery entry at Signal Peak Energy?s Bull Mountain No. 1 mine was designed to prevent the abnormal roof conditions encountered in its firsttwo recovery entries. Un
Jan 1, 2014
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Hydrogeologic Effects Of Subsidence At A Longwall Mine In The Pittsburgh Coal Seam
By Leslie Carver
The effects of longwall mine subsidence on water resources were studied at a West Virginia coal mine (mine Z) by Carver (1994). Data were obtained for 137 domestic supply wells and springs and 12 base
Jan 1, 1994
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A New Generation of Web-Based Applications for Mine Design
By Nathaniel Schaefer, Christopher Newman, Zach Agioutantis
"As mining reserves continue to be developed in deeper and more complex geological and geometric conditions, there has been an increased demand for underground mine designs to better reflect site-spec
Jan 1, 2017
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Calibrating LaModel for Subsidence
By Keith A. Heasley, Jian Yang
"LaModel uses a laminated overburden boundary-element model and can calculate not only seam-level stresses and displacements but also surface subsidence for thin tabular deposit such as coal seams (He
Jan 1, 2016
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Considerations for Effective Ground Support in Evaporites
By C. A. Vining, J. R. Nopola
"Evaporites, such as salt and potash, pose unique problems to ground-support designs not encountered in other rock types. Evaporites are subject to continual creep and no amount of ground support can
Jan 1, 2018
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Hydraulic Prestressing Units: An Innovation In Roof Support Technology (6dbf7428-5679-47b2-a60c-95193c59dbda)
By Thomas Barczak
A new generation of hydraulic mine support prestressing devices has been developed. These thin-walled steel shells are machine-welded and can be inflated with water or any liquid to provide prestressi
Jan 1, 2004
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Enlightening Bolts: Using Distributed Optical Sensing to Measure the Strain Profile along Fully Grouted Rock Bolts
By Andrew Hyett
Over the last 30 years, a transition away from end-anchored bolts to fully grouted rock bolt systems has occurred in many underground mines. It seems geomechanically intuitive that the success of such
Jan 1, 2013
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Ground Control Experiences in a High Horizontal Stress Field at Inland Steel Coal Mine NO. 2,
By C. Thomas Blevins
This paper is intended to be a hands on experience account about ground control in a Southern Illinois coal mine. Its aim is to show how a combination of real world mining practices and constraints al
Jan 1, 1984
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Sandy Creek Waterfall?Case Study of Successful Management of the Potential Impacts of Longwall Mining on a Sensitive Natural Surface Feature
By Bruce K. Hebblewhite
BHP Billiton Illawarra Coal operates Dendrobium Mine in an area 10-20km west-northwest of Wollongong in the Southern Coalfield of New South Wales, Australia. The mine recently completed longwall mini
Jan 1, 2014
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Highwall Stability Implications from Longwall Mining at Broadmeadow Mine
By Bob Coutts, Matt Martin, Dan Lynch, Dan Payne
"The Broadmeadow punch longwall coal mine in Central Queensland Australia has experienced significant highwall movement associated with the effect of longwall subsidence when the longwalls approach th
Jan 1, 2018
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Cable Bolts - An Effective Primary Support System
By Stephen C. Tadolini, John P. McDonnell
"High-strength cable bolts have been used for ground support in underground coal mines for many years. Cable bolts are routinely used as secondary ground support in numerous longwall gateroad support
Jan 1, 2010
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SDPS Update: Easy Calculation of the Edge Effect Offset for Complex Extraction Panels
By Joshua Hescock, Zach Agioutantis
"The Surface Deformation Prediction System (SDPS) has been developed as an engineering tool for the prediction of subsidence deformation indices through the implementation of an influence function. SD
Jan 1, 2017
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Design Considerations for Tensioned Bolts
By Yunqing Zhang
The 3-D numerical modeling using ABAQUS is performed to analyze the mechanisms of the tensioned bolts by taking into considerations excavation sequence, pre-tension, bedding planes and in-situ horizon
Jan 1, 2002
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Research, Development, And Use Of Steel-Fiber-Reinforced Concrete Cribbing For Mine Roof Support
By Dale A. Didcoct
Through the combined efforts of the C. S. Bureau of Mines, the coal industry, and Burrell Construction and Supply Company, New Kensington, PA, a steel fiber reinforced concrete crib block to improve c
Jan 1, 1982
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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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Spatial Trends In Rock Strength - Can They Be Determined From Coreholes? (51393e91-3e75-4a8d-ac36-e107a993fe35)
By Christopher Mark
Mine planning for a new reserve is based on information obtained from exploratory coreholes. A critical component of an exploration program is the geotechnical evaluation. Poor assumptions about roof
Jan 1, 2004
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Roadway Supporting Technology Applied to Very Soft Coal Seam at Yanlong Mining Area in China
By Sheng Zhang
The compressive strength of coal in Yanlong mine area of China is less than 3 MPa. Basically, it is powdery. The roof and floor rocks are mudstone. Therefore this coal seam is a typical ?three soft? c
Jan 1, 2013
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Axial Performance of a Modified Fully Grouted Cable Bolt Tested with a New Laboratory Short Encapsulation Pull Test
By Paul C. Hagan, Jianhang Chen, Serkan Saydam
"Modified cable bolts are commonly used in underground mines due to their superior performance in preventing bed separation when compared with plain strands. To better test the axial performance of a
Jan 1, 2015
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Practical Detection Of Underground Mine Roof Failure
By David Bigby
The paper describes research undertaken on an ECSC/K HSE project which investigated several potential physical principles which might be harnessed to provide a non-intrusive means of determining the e
Jan 1, 2004
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A Study On The High-Water Solidifying Materials For Gob-Along Roadside Instead Of Coal Pillars
By Yunxin Qiu
A new technology has been introduced - the use of the High-Water Solidifying Material for providing pumped roadside supports to maintain a roadway for re-use in longwall retreating. As a gob edge supp
Jan 1, 1992