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  • SME-ICGCM
    Acoustic Scanner Analysis of Borehole Breakout to Define the Stress Field Across Mine Sites in the Sydney and Bowen Basins, Australia

    By S. MacGregor

    The role of horizontal stress, its orientation and magnitude, in defining the behaviour of strata in underground coal mines has been well established. Poor panel layouts have led to gate end stress co

    Jan 1, 2002

  • SME-ICGCM
    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

  • SME-ICGCM
    Rock Reinforcement Longevity

    By Francis S. Kendorski

    Rock reinforcement has been in widespread use and generally has been accepted in underground mining and tunneling since the 1950s. The first rock reinforcement technologies employed were mechanical an

    Jan 1, 2000

  • SME-ICGCM
    Continuing Development of Innovative Cable Support Systems

    By John G. Oldsen

    Passive cable bolting and active cable trusses have been used in roof support for more than two years Excellent roof control has been experienced by many coal operations. This paper covers the new

    Jan 1, 1997

  • SME-ICGCM
    Mitigating Subsidence Influences on Residential Structures Caused by Longwall Mining Operations

    By Yi Luo

    The severity of disturbances caused by longwall mining subsidence to various residential structures can be re¬duced. The success of such mitigation efforts depends on accurate subsidence prediction, c

    Jan 1, 2003

  • SME-ICGCM
    Downhole Overcoring Stress Measurement at a Western Underground Coal Mine

    By David Conover

    Knowledge of the magnitude and direction of the horizontal secondary principal stresses is a critical factor in designing the layout and mining sequence of underground openings. Typically, horizontal

    Jan 1, 2004

  • SME-ICGCM
    Investigations Of Underground Coal Mine Bursts

    By K. Haramy

    Coal mine bursts or bumps involve the violent, rapid failure of coal and rock in or around a mine excavation. Failure is normally associated with high stress and brittle or brittle-elastic materials;

    Jan 1, 1984

  • SME-ICGCM
    RQD from the Barrel to the Box: Weatherability May be a Better indicator for Roof Support Design

    By Kot Unrug

    For the purposes of underground mine design, twelve cores of the Springfield (V) Coal (Pennsylvanian) roof and floor were retrieved. Each core was photographed, described fresh in the barrel, and the

    Jan 1, 2003

  • SME-ICGCM
    Evaluation Of Support Performance In A Highly Stressed Mine

    By Hamid Maleki

    The U.S. Bureau of Mines implemented a monitoring program in a western U.S. coal mine for the evaluation of both conventional and alternative support systems. The conventional support consisted of 2.5

    Jan 1, 1994

  • SME-ICGCM
    Application Of DDM To Some Rock Pressure Problems In Japanese Deep Coal Mines

    By Yoshiaki Fujii

    Displacement Discontinuity Method (DDM), which was originally developed by Crouch,S.L., is a powerful tool to calculate mechanical disturbances due to tabular excavations. Three topics on DDM applicat

    Jan 1, 1992

  • SME-ICGCM
    Mine-Wide Physical Property Trend Identification Using Portable Onsite Test Devices

    By Thomas L. Vandergrift

    The type and severity of coal mine entry failures are affected by the strength and stiffness properties of the roof, floor, end coal. Knowledge of the mine-wide trends of these properties Is valuable

    Jan 1, 1990

  • SME-ICGCM
    Development of a Risk Rating System for Use in Underground Coal Mining

    By Johann van Wjk

    Mandatory Codes of Practice to Combat Rock Fall Accidents came into force on South African Collieries in 1997. These were drawn up in accordance with guidelines issued by the Chief Inspector of Mines,

    Jan 1, 2002

  • SME-ICGCM
    Failure Modes Of Mine Tunnels In Stratified Rock Structures With Reference To Stress Field Conditions

    By Hui Chen

    The paper describes the use of a physical model technique to investigate the failure modes of mine tunnels with reference to the in situ stress field. The characteristics of stratification commonly en

    Jan 1, 1993

  • SME-ICGCM
    Mine Convergence When Using Mobile Roof Supports In Pillar Recovery

    By J. R. Stoltz

    To date, there has been limited formal research dealing with the use of Mobile Roof Supports (MRS) for pillar recovery. This paper, which is a portion of a larger project, presents convergence data fr

    Jan 1, 1999

  • SME-ICGCM
    Determination Of Classification Parameters For Clay - Bearing And Stratified Rock Mass

    By Erdal Unal

    In underground mining today, safety and economical aspects demand a better understanding of the rock-mass conditions, particularly for design of underground mine openings excavated in weak and stratif

    Jan 1, 1990

  • SME-ICGCM
    Roof Screening: Best Practices and Roof Bolting Machines (e5909744-6953-4a41-b02f-21226966b63f)

    By Susan Robertson

    Many injuries are caused each year by rock falls in coal mines. Most of these injuries are not caused by major roof collapses, but from falls of smaller rocks from the immediate top or roof skin. Vari

    Jan 1, 2002

  • SME-ICGCM
    Load Deformation Behavior Of Simulated Longwall Gob Material

    By Deno M. Pappas

    The purpose of this U.S. Bureau of Mines study was to determine the material stiffness properties of the gob for use in numerical models of rock mass response to longwall mining. Photographs of actual

    Jan 1, 1993

  • SME-ICGCM
    The Effect of Standing Support Stiffness on Primary and Secondary Bolting Systems (956b0a5f-7133-4b32-8a8e-517785f1d52a)

    By Stephen Tadolini

    Standing crib supports have been applied in underground mining programs to resist large roof movements and sustain high¬loads. The strength and deformation capability of these systems has been documen

    Jan 1, 2003

  • SME-ICGCM
    Tensile roof failure arising from horizontal compressive stress and geological slips

    By Alan Bugden

    Goedehoop colliery in South Africa has experienced a number of substantial roof falls in roadways and intersections. Many of these have been associated with geological slips and/or horizontal compress

    Jan 1, 2003

  • SME-ICGCM
    Factors Influencing Intersection Stability in U.S. Coal Mines (dc39f664-0f70-474b-be24-4adbb66c7510)

    By Gregory Molinda

    Groundfalls are much more likely to occur in coal mine intersections than in entries. NIOSH is using the experience of U.S. coal mines to determine the factors which influence intersection instability

    Jan 1, 1998