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Investigation of Pillar Loading Considerations in Determination of Pillar Stability Factors for Longwall Gateroad DesignBy Heather E. Lawson
Recent field data providing measured pillar loading from a deep western mine revealed that an increased load transfer distance existed compared to expected values (Larson et al., 2012). Additionally,
Jan 1, 2013
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Detailed Underground Measurements Of Roof Deflection And Bed SeparationBy André Vervoort
To learn more about the fundamental roof behaviour in South African coal mines, accurate underground measurements of roof deflection were conducted in bord and pillar panels during development and pil
Jan 1, 1992
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Innovative Ground Support System (23660f1b-763d-4a59-bd83-98b27cd5764f)By P. A. Gray
Artificial ground support has developed into a relined science over the past 20 years. From reactive support systems such as timber props and steel supports, to active systems such as roof bolts and c
Jan 1, 1992
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Longwall Roof Fall Prediction and Shield Support RecommendationsBy Ulrich Langosch
In the 1990s the German mining industry introduced a new generation of shield supports. The new design of support has a maximum load capacity of 10,000 kN, making these units as strong as the shields
Jan 1, 2003
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An Analysis of Rock Failure Around a Deep Longwall Using MicroseismicsBy Keith Heasley
In this paper, a state-of-the-art, three-dimensional, full waveform, microseismic system was used to analyze the rock failure around a deep (> 750 in (2500 ft) of cover) bump-prone longwall panel. The
Jan 1, 2001
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Control Of Mine Subsidence Utilizing Coal Ash As A Backfill MaterialBy D. W. Evans
Mine subsidence problems due to coal extraction have occurred in a number of areas throughout the United States. Depending on the local geology, the depth of the mined seam, the type of mining method
Jan 1, 1982
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Tunnel Deformation Monitoring "Action Levels" In Coal Mines For Support/Reinforcement DesignBy Lorraine Kent
Mine tunnel support using rockbolts was introduced in UK coal mines over the period 1987- 1992 and is now used in over 70% of all mine tunnels. In every case the reinforcement design has been based on
Jan 1, 1999
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Numerical Modeling of Stress Distribution of Gateroads Subjected to Dynamic Pressure of Longwall Mining in the Immediate Overlying Seam, a Case StudyBy Ximeng Li
The entries that are subjected to dynamic pressure are much more difficult to maintain due to repeated disturbance. A case study of an entry stress distribution was performed using the FLAC3D program.
Jan 1, 2013
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Improved Roofbolting Methodologies: Reducing Hydraulic Fracture of StrataBy David W. Evans
"Induced hydraulic fracture of strata during roof bolt installation is a potentially prevalent, but masked phenomenon within the underground coal industry. Previously reported resin testing programs (
Jan 1, 2015
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User-Friendly Finite Element Design of Main Entries, Barrier Pillars, and Bleeder EntriesBy William G. Pariseau, Mark K. Larson, Douglas R. Tesarik, Heather E. Lawson
"This contribution describes development and application of a user-friendly finite element program, UT3PC, to address three important problems in underground coal mine design: (1) safety of main entri
Jan 1, 2017
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Analysis of Gateroad Stability at Two Longwall Mines Based on Field Monitoring Results and Numerical Model AnalysisBy David F. Gearhart, Mark Van Dyke, Heather Dougherty, Ted Klemetti, Gabriel S. Esterhuizen
"Coal mine longwall gateroads are subject to changing loading conditions induced by the advancing longwall face. The ground response and support requirements are closely related to the magnitude and o
Jan 1, 2018
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A Survey of the Current Rib Support Practices and Techniques in U.S. Coal MinesBy Khaled M. Mohamed, Michael M. Murphy, Ted M. Klemetti, Heather E. Lawson
"The design of rib support systems in U.S. coal mines is based primarily on local practices and experience. A better understanding of current rib support practices in U.S. coal mines is crucial for de
Jan 1, 2015
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Longwall Shield Recovery, Using Phenolic Foam Injection for Gob Control As An Alternative to Recovery MeshBy James D. Pile
Following a methane ignition in the active panel of a longwall coal mine, the affected panel was successfully isolated from the rest of the mine. This allowed for the remainder of the mine to return t
Jan 1, 2013
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The Impact Factors of Overburden Movement in Longwall Mining of Shallow Coal SeamsBy Yang Li
For the study of overburden movement in longwall mining of shallow coal seams, most scholars merely consider the thickness of bedrock and top soils. In this paper, the overburden movement in longwall
Jan 1, 2014
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Three Dimensional Analysis of Strain and Ground Surface Displacement Caused By Underground Mining in the Vicinity of Geotechnical BarriersBy Rafal Misa
In order to prevent the formation of mining damage or to reduce its reach, it is advisable to look for technical solutions which would enable effective protection of construction sites from the impact
Jan 1, 2014
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A Roof Model and Its Application in Solid Backfilling MiningBy Meng Xiao, Peng Huang, Lizin Lan, Feng Ju, Shuai Guo
"Through changing the axial load on backfilling material compaction test to reflect different overlying strata pressure on backfilling material, the stress-strain relations in the compaction process o
Jan 1, 2016
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Deformation Mechanism and Floor Heave Control Technology in Deep? Buried Full Seam ChamberBy Xicai Gao
With the intensification and expansion of deep coal mining, the surrounding rock stress environment becomes further deteriorated because of the complicated geological environment and powerful mining e
Jan 1, 2013
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Ground Control of Longwall Top–Coal Caving Faces within Thick Coal SeamsBy Jinwang Zhang, Zhaohui Wang, Jiachen Wang
"Thick coal seams (seam height larger than 3.5 m) account for a large portion of the proven coal reserves of China, and underground thick coal seam mining provides about 50% of the Chinese annual coal
Jan 1, 2017
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Support Strategy for Tailgates below Gob Edge Using Split-Level Longwall Panel Layout for Deep Inclined Coal SeamsBy Pengfei Wang, Guorui Feng
With increase of cover depth, dynamic incidents, such as large gateroad convergences and coal bursts, are frequently encountered when mining deep longwall panels. It would be more adverse due to large
Jan 1, 2018
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Variation In The Load Transfer Of Fully Encapsulated RockboltsBy Paul Hagan
A diverse range of rockbolt designs and resin anchors are available for use in underground mines. Despite their wide spread use, the factors that affect the performance a rockbolt is not fully underst
Jan 1, 2004