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Time-dependent Behavior of Immediate Weak Floor Strata from an Illinois Coal Mines
By Y. P. Chugh
The paper discusses laboratory and field studies to analyze time-dependent deformation behavior of immediate weak floor strata in an Illinois coal mine. In the laboratory, core samples of the immediat
Jan 1, 1987
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The Impact Of Three Longwall Coal Mines On Streamflow In The Appalachian Coalfield
By Denise Y. Dizon
The objectives of this study were to document the hydrologic impacts of longwall mining on streams, identify the factors affecting the extent of stream dewatering, and develop empirical trends to pred
Jan 1, 1990
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Mining Under Strong Roof
By K. Y. Haramy
Strong roof helps minimize roof fall problems in coal mine entries. However, the Inability of strong roof to cave readily may contribute to major ground control problems In Iongwall and retreat mining
Jan 1, 1988
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Longwall Pace Bursts and Inadequate Caving: A Came Study
By K. Y. Haramy
Deep coal mines with strong roof and floor strata frequently encounter face and rib bursts. The burst problem becomes more severe with increased depth. While the exact causes of bursts are often diffi
Jan 1, 1987
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Coal Combustion Byproducts-Based Artificial Mine Supports - Recent Developments
By Y. P. Chugh
The use of wooden supports, supplementary to the primary method of roof control using roof bolts in mines, consumes over 3 million cubic meters of hardwood in the U.S. annually. These supports arc pri
Jan 1, 2004
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Characterization Of Overburden Response To Longwall Mining In The Western United States
By Khamis Y. Haramy
The U.S. Bureau of Mines installed surface and subsurface instruments at a mine site in Colorado to monitor and characterize the overburden response to longwall mining. Instrumentation included a time
Jan 1, 1992
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Development And Demonstration Of An Alternate Mining Geometry For Improved Ground Control In An Illinois Coal Mine
By Y. P. Chugh
About 60-70% of the underground mined coal in Illinois is extracted using a room-and-pillar mining method that permits extraction of about 50% of the coal. The remaining coal is left behind in the for
Jan 1, 2004
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Subsidence Studies In Thick And Steep Coal Seam Mining
By M. Y. Fisekci
This paper concentrates on subsidence measurements, applied over the thick and steep seam mining in the Rocky Mountains Region of Western Canada. The studies to date indicate that two new subsidence m
Jan 1, 1981
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Stability And Control Of Immediate Roof Of Fully Mechanized Coal Face
By S. Y. Liu
Based on the underground measurements, physical model test of simulated materials in the laboratory and finite element analysis, this paper demonstrates the pattern and process of roof fall over the t
Jan 1, 1990
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Three?Dimensional Ground Stability Study Around a Mine Tunnel in a Highly Discontinuous Rock Mass under Significant in Situ Stress
By Pinnaduwa H. S. W. Kulatilake
To exploit an underground mine effectively and safely, it is important to have a good understanding of the geotechnical behavior of the rockmass surrounding the underground mine excavation. The aim of
Jan 1, 2013
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An Approach to Predict Rock Mass Deformations in Three Dimensions for a Part of an Open Pit Mine and Comparison with Field Deformation Monitoring Data
By Pinnaduwa H. S. W. Kulatilake, Biao Shu
The intact rock properties and discontinuity properties for both Devonian Rodeo Creek (DRC) and Devonian Papovich (DP) rock formations that exist in the selected open-pit mine were determined from tes
Jan 1, 2015
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Monitoring Consolidation Settlement Deformation in Deep Borehole of Unconsolidated Strata USing Fiber Bragg Grating Sensing
By Liang Dong, Jinxuan Liu, Biao Qiu, Jing Chai
"The Cenozoic unconsolidated strata in the east area of China are composed of clay, sandy clay, fine sand, hardpan, etc. Numerous shafts of the coal mines in these areas have been damaged in various d
Jan 1, 2010
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The Relationship between Ultrasonic Velocities and Mechanical Damage in Sandstone under Cyclic Loading
By Hongwei Zhang, Sen Yang, Shimin Liu
"This laboratory study investigates the damage evolution of sandstone specimens under two types of cyclic loading conditions through monitoring and analyzing the variations of elastic moduli and ultra
Jan 1, 2017
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Multi?stage Testing Procedures, Verification, and Results for Strong, Brittle Sandstone
By Michael Murphy
A multi-stage triaxial procedure has been developed for the enhanced servo controls and feedback systems at the National Institute for Occupational Safety and Health (NIOSH) rock mechanics laboratory.
Jan 1, 2014
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Slope Stability at Open Cut Mining Due to Subsidence on Old Underground Mining Area
By Andre Zingano
An underground mine using room and pillar and retreat mining methods was developed during the 1950?s. In 2009 an open cast mine was opened in the same reserve with the objective of mining five coal se
Jan 1, 2013
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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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Study of the Behavior for Backfilling Material in Room-and-Pillar Coal Mining
By Joao Felipe Costa, Jair C. Koppe, Andre Zingano, Cleber Gomes
"Run-of-mine Brazilian coal has high ash content and low calorific power. Therefore, the coal must be washed to achieve the power plant specifications for burning coal. A large amount of waste results
Jan 1, 2010
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Establishment and Application of Deformation Monitoring System of Roadway Based on the Three?Dimensional Model Experiment
By Yongping Wu
Roadway deformation and stress migration occur with uncertainty and randomness because of geology, tunneling and mining influence. In order to study the surrounding rock deformation and failure mechan
Jan 1, 2013
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Underground Longwall Mining with the Impact of Disturbed Areas by Abandoned Gateroads and Small Gobs
By Enguang Zhu, Kangning Zhang, Yang Li
"Due to the use of outdated mining technology or room and pillar mining process in small coal mines, the coal recovery ratio is only 10% - 25%. In many regions of China: the damage area caused by the
Jan 1, 2016
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Controlling Subsidence Effects Using Partial Backfilling
By Yingzin Zhou
Partial backfilling can be used to reduce and control surface subsidence damage caused by longwall mining or pillaring operations in room-and-pillar mines. The use of partial backfill as opposed to to
Jan 1, 1990