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  • SME-ICGCM
    Use Of Database In Ground Control To Identify Weightings And Water Inflows

    By G. C. Xiao

    A database, incorporating historical data from British mines, to study the factors affecting inflows from proximate aquifers into longwall workings, showed that a main casual factor was the immediate

    Jan 1, 1990

  • SME-ICGCM
    Multiseam Mining On South African Collieries

    By R. W. Hill

    Multiseam mining has been carried out at many collieries in South Africa. It the seams are In close proximity difficult and dangerous mining conditions may arise. In the Witbank area multiseam bord an

    Jan 1, 1995

  • SME-ICGCM
    Estimating Rock Strengths Using Drilling Parameters During Roof Bolting Operations - Progress Report

    By Yi Luo

    Accurate mechanical and geological information of the roof strata is vital for roof bolting design in underground mines. In order to obtain such information in a timely manner, a research has been und

    Jan 1, 2002

  • SME-ICGCM
    Regional Horizontal Stress And Its Effect On Longwall Mining In The Northern Appalachian Coal Field

    By D. W. H. Su

    This paper presents the results of ill situ horizontal stress measurements using a Minifrac system in several northern Appalachian coal mines. The effect of stress magnitude and orientation on longwal

    Jan 1, 1995

  • SME-ICGCM
    The Broken Rock Zone Around Tunnels And Its Support Theory

    By Fangting Dong

    The broken rock zone (BRZ) and the tunnel support theory are investigated. The relationship between the BRZ and the related factors, the interaction between the BRZ and supports, and the function of s

    Jan 1, 1988

  • SME-ICGCM
    Optimization Of District-Wide Mine Layout In Multi-Seam Mining: A Case Study

    By Huamin Li

    Mine # 8 of Pindingshan Coal Group, Henan Province, China has an annual production 2 million metric tons. But it encounters many problems, e.g. mine layout is complicated, roadway maintenance is diffi

    Jan 1, 2000

  • SME-ICGCM
    Reinforcement of Large Pillars by Bolting (8821999e-4c04-46db-a69e-e7a56781ac96)

    By S. J. Mitchell

    An analysis of bolting reinforcement of several large [approximately 18 m (60 ft) cube] pillars was performed. The many overcoring stress profiles in pillars at the mine were used to produce generaliz

    Jan 1, 1984

  • SME-ICGCM
    Simulated Materials Modeling And Analysis Of The Overburden Strata Movement In Top Coal Caving Mining

    By Zhou Ying

    Based on the mining condition and roof lithology of the 2-3 coal seam at Gengcun Mine, the simulated materials modeling method was used to study the movement process and characteristics of overburden

    Jan 1, 2001

  • SME-ICGCM
    A Method for the Selection of Rock Support Based on Bolt Loading Measurements

    By Stephen P. Signer

    A method to assist in the evaluation and selection of roof bolts using in situ measurements of roof bolt loading has been developed by researchers of the Spokane Research Center, National Institute of

    Jan 1, 1997

  • SME-ICGCM
    Application of Yield-Lok Bolt for Bursting and Convergence Grounds in Mines

    By Rocky Wu

    Rock bursts are one of the greatest challenges to ground control in the mining industry. With increasing mining depth and mining scale, there are more and more industry requirements on yielding rock s

    Jan 1, 2011

  • SME-ICGCM
    Geo-Mechanical Property And Failures Of Weak Roof Shales In Coal Mines

    By Yunqing Zhang

    Weak shales refer to those with lower strength, thinly- laminated structure, sensitivity to moisture and weathering as well as significant time dependent behavior. It has been said that many future co

    Jan 1, 2004

  • 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
    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
    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