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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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Characteristic Acoustic Emission Sequences of Rock Samples Under Uniaxial Loading
By Nic Slatalla
Acoustic emission monitoring techniques are a powerful tool for analysing deformation behaviour and fracture characteristics of rock samples under uniaxial loading. Uniaxial compression tests wer
Jan 1, 2008
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A Statistical Overview of Retreat Mining of Coal Pillars in the United States
By Christopher Mark
The demographics and safety record of the pillar retreat segment of the U.S. coal industry was analyzed using statistics collected by the Mine Safety and Health Administration. Pillar recovery is prac
Jan 1, 1997
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Stress Environment of Entry Driven Along Gob-Side through Numerical Simulation Incorporating the Angle of Break
By Pengfei Wang, Guorui Feng
"The angle of break is the acute angle created by the coal seam bedding plane and caving line formed by roof strata movement after extraction of a longwall panel. It has a significant influence on str
Jan 1, 2018
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Underground Mining Technology in Chinese Coal Mines
By Jiachen Wang
China is the largest coal producing country in the world. Coal is widely distributed in China and thus the mining conditions are complex and diverse. This paper summarizes the important achievements i
Jan 1, 2014
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Jenmmar Compression Roof Control System
By John C. Stankus
To improve mine roof bolt performance, Jennmar Corporation commenced the design and development of a new roof control sys- tem. This new system designated "Insta'l Compression", not only improves
Jan 1, 1990
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Roof Bolting in Low Seam Mining with Thick "Stack Rock" Roof under High Horizontal Stress
By Peter Zhang, Gary Deemer, Rod Lawrence, Scott Peterson, Scott Wade, Mike Mishra, Rick Smith, Robert Bottegal, Ed Zeglen
"Thinly-laminated silty shale that falls like ""stack rock"" is always difficult to support in underground coal mines. With thin laminations of 2.5 to 52 mm (0.1 to 2 in) thick and weak bonding betwee
Jan 1, 2010
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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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Historical Perspective And Future Projection Of Longwall Mining In The United States (19eaaffe-326c-46a4-9a81-dc104b2df560)
By Thomas M. Barczak
This report chronicles the historical development of longwall mining in the United States and speculates on future developments to the turn of the century. Five eras of technological development durin
Jan 1, 1992
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In-Situ Coal Strength Determination - Case Studies
By Kot F. Unrug
Strength of coal is one of the governing factors in size determination of mine pillars, and therefore affects the percentage of extraction and thus, utilization of reserves. Coal strength is also impo
Jan 1, 1995
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The Use of Strata Management Techniques for the Optimisation of Secondary Support in Longwall Installation Roadways at United Colliery, NSW, Australia
By Kieran Black
The immediate roof lithology at United Colliery is extremely variable and provides a challenge for the design of secondary support. Support design in recent longwall installation roads at the mine has
Jan 1, 2007
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A Lineament Analysis Case Study of the Fola Coal Co., LLC. No. 2 Surface Mine, West Virginia
By Paul L. Tyrna
The Fola Coal Co., LLC No 2 surface mine, located in Nicholas and Clay Counties, WV, exploits up to nine coal seams by contour, highwall, and mountain top removal mining methods. After encountering fa
Jan 1, 2001
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Mechanism and Prevention Measure of Rib Spalling in 6.5 Meter High Caving Face in Thick Coal Seam with Undulated Floor
By Weidong Pan, Yinchao Yang, Baodong Zuo
Fully mechanized mining technology, with a large cutting height in thick coal seam, has been developed to be large-scale, mechanized, and intelligent. Furthermore, it is also superior to other mining
Jan 1, 2017
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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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Determination of the Strength of Powered Roof Supports According for Fatigue Life
By Monika Patrycja Polak - Micewicz
This paper presents an approach for estimating the fatigue life for the base of powered roof supports (shield) manufactured by the FAZOS roof support company. FAZOS?s powered roof supports are designe
Jan 1, 2012
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Mine Pillar Stability Analysis Using Fem Methods - Two Case Studies
By David H. Tang
Massive pillar failures were observed at two underground coal mines. The results of stability analysis using traditional pillar design formulae did not agree with the underground observations. Finite
Jan 1, 1990
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Ground Control and Safety Implications of Blast Damage in Underground Mines
By Stephen Iverson
The National Institute for Occupational Safety and Health (NIOSH) is currently performing research to help mine operators minimize the amount of loose or damaged rock surrounding a blasted opening. I
Jan 1, 2007
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Strata Movement Around Large Mining Height Face Area with Fully Mechanized Method in Steeply Dipping Thick Seam
By Yongping Wu
The steeply dipping coal seams in this paper refer to those with the angle of inclination ranging from 35° to 55°. The reserves of the steep coal seams account for approximately 15%~20% of the total c
Jan 1, 2014
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An Improved Technique of In-Situ Measurement Of Fracture Zones Surrounding Gateroads
By B. G. D. Smart
An understanding of the nature of yield zones surrounding coal mine excavations is fundamental to the design of mine support systems. Various methods have been designed for investigation of undergrou
Jan 1, 1984
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Surface And Borehole Microseismic Monitoring Of Longwall Faces; Their Potential For Three-Dimensional Fracture Imaging And The Geomechanical Implications.
By Styles P.
To determine whether 130 felt earth tremors around Edwinstowe, Nottinghamshire U.K, which also experienced severe surface fissuring, were caused by coal extraction, a surface seismometer array was est
Jan 1, 1992