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Intrinsic Response Of Borehole Pressure Cells Laboratory Calibration And Nonlinear Fem Simulation
By D. Su
This paper presents the details and results of a preliminary investigation into the response of borehole pressure cells (BPCs) in soft coal. Two parallel approaches, laboratory calibration and nonline
Jan 1, 1990
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Aspects of Chain Pillar Design in Relation to Longwall Mining
By B Whittaker
The paper examines the role of chain pillars in longwall mining layouts as used in several countries. The application of chain pillars in relation to their expected design role is discussed. An import
Jan 1, 1987
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Clay Veins: Their Physical Characteristics. Prediction, and Support
By Frank E. Chase
Clay veins, also referred to as clay elastic dikes, have been responsible for numerous underground injuries and fatalities. These hazardous structures are also responsible for increased production cos
Jan 1, 1984
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Effects of In-seam and Near-seam Conditions and Asymmetric Pillar Loading on Coal Pillar Strength
By Daniel W. H. Su
The importance of incorporating fundamental principles of rock material response and failure mechanics into a pillar strength design model has been demonstrated. To accurately assess pillar strength,
Jan 1, 1997
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Rock Mechanics Property Data Bank For Coal Measure Strata
By G. C. Sun
Rock mechanics properties, i.e. uniaxial and triaxial compressive strength, indirect tensile strength shear strength, Young's modulus, and poisson's ratio were collected for coal and related
Jan 1, 1993
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Outburst Control in Underground Coal Mines,
By Floyd D. Varley
Outbursts, the sudden and violent out- pouring of material into mine openings, is a ground control problem increasingly encountered in the United States as deeper seams are developed. Outbursts, cause
Jan 1, 1986
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25 Years of Progressive in Numerical Modeling for Ground Control ? What Have We Accomplished and Where Do We Go Next?
By Keith A. Heasley
Exactly 25 years ago this month (August 12, 1981), IBM introduced the ?Personnel Computer? with a 16 bit operating system called MS-DOS 1.0. Since then, Moore?s Law, which essentially states that
Jan 1, 2006
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A Simple Tool to Measure Stress in Mine Backfill
By A. MacG. Robertson
A cone penetrometer has been used to assess the level of stress existing in hydraulically placed mine backill. The test apparatus was fabricated at the mine and consisted of a steel cone, connector ro
Jan 1, 1986
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Underground Movement Of Rock Mass And Stress Distribution Due To Multiple Mining
By Victor V. Nazimko
Multiple mining generates gob-interaction displacements. They redistribute stress m strata and obey laws of irreversibility thermodynamics. An irreversible state causes inhomogeneity of the stress dis
Jan 1, 1996
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Outcomes of the Landmark Longwall Automation Project with Reference to Ground Control Issues
By Michael Kelly
Inertial navigation technology has, for the first time, allowed the position of a longwall shearer to be mapped in three dimensions. Following the success of the technology in highwall mining and succ
Jan 1, 2005
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Application of the Coal Mine Roof Rating, Derived from Drill Core, in the Roof Support Design of a Coal Belt Conveyor Tunnel
By John Rusnak
The Coal Mine Roof Rating (CMRR) is a practical rock mass classification system for use in design of mine openings. Data can be obtained for this purpose from exploration drill cores if simple geotech
Jan 1, 1998
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Interaction Subsidence In The Sydney Coalfield, Nova Scotia
By Peter Cain
The paper presents previously unpublished results derived from an unique interaction moitoring program conducted in the Sydney Coalfield of Nova Scotia. An abandoned, sealed longwall gateroad was r
Jan 1, 1996
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Integration Of CAD-Based Mine Planning And Subsidence Engineering Systems
By Andrew P. Jarosz
The present computerized mine planning systems use CAD-like and Data Base Management System (DBMS) environments for the handling of numerical, textural, and graphical data. These two environments are
Jan 1, 1995
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A Simple Method Of Measuring Rock Fracture Toughness Using The Brazilian Test Method
By H. Guo
There are a number of methods available for the determination of the fracture toughness of rock. Some of the most recognised methods include the hollow pressured cylinder, the short-rod, the chevron -
Jan 1, 1992
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Coal Pillar Strength Based On The Ground Reaction Curve - A New Approach
By Kazem Oraee
In underground coal mining, particularly room-and-pillar methods, the coal pillars play a significant role in roof stability. If the pillar dimensions are increased, the pillar bearing capacity also i
Jan 1, 2009
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Preventing Roof Fall Fatalities during Pillar Recovery: A Ground Control Success Story
By Michael Gauna, Christopher Mark
"For decades, pillar recovery accounted for a quarter of all roof fall fatalities in underground coal mines. Studies showed that a miner on a pillar recovery section was at least three times more like
Jan 1, 2016
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Design Of Longwall Extractions Under Flooded Abandoned Workings In The Sydney Coalfield
By Peter Cain
Longwall extraction in the Phalen Scam in the Sydney Coalfield of Nova Scotia is carried out under flooded abandoned workings in the Harbour Seam 140 m above, and at depth of up to 700 m beneath the A
Jan 1, 1996
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A Casting Method For Artificial Rock Specimens
By Da Zhao Gu
An important problem in rock engineering is to control the properties of artificial rock. A compaction technique for casting artificial rock specimens with controlled properties is described, i.e. usi
Jan 1, 1992
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Field Verification of the Roof Fall Risk Index: A Method to Assess Strata Conditions
By Anthony T. Iannacchione
The Roof Fall Risk Index (RFRI) is a new method introduced by the National Institute for Occupational Safety and Health (NIOSH) to assist the underground stone mine operator in 1) assessing defects t
Jan 1, 2006
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Empirical Mine Design for Western Underground Metal Mines
By Thomas M. Brady
The Spokane Research Laboratory/NIOSH and the University of British Columbia (UBC) geomechanics group are focusing on the development of safe and cost-effective underground design guidelines for weak
Jan 1, 2006