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  • SME-ICGCM
    The Response Of Massive Structures Inferred From Tidal Tilt Monitoring (a922d488-04e7-4665-bcdd-a85115c8db5e)

    At any given lime, the tidal force subjects massive regions to a spatially uniform load. The deformation of any large structure due to these forces is proportional to the elastic properties of the str

    Jan 1, 1992

  • SME-ICGCM
    A Critical Study of Strata Behaviour During Extraction of Pillars in a Thick Coal Seam

    By S. Jayanthu

    This paper presents analysis of strata behaviour with special reference to convergence and stress variation during an experimental trial of extraction of pillars with cable bolts as major support syst

    Jan 1, 1998

  • SME-ICGCM
    Performance and Safety Considerations of Hydraulic Support Systems (eb62774d-dbca-420f-b228-950711bafbce)

    By Thomas Barczak

    Hydraulic cylinders are used in several roof support systems, such as longwall shields and mobile roof supports, to provide critical ground control Many state-of-the-art hydraulic support system opera

    Jan 1, 1998

  • SME-ICGCM
    Evaluation Of Mobile Roof Support Technologies

    By Hamid Maleki

    This study presents a historic overview of the role of mobile roof support (MRS) technologies in improving stability and worker safety and presents the results of recent field evaluations of the MRS l

    Jan 1, 2001

  • SME-ICGCM
    The Stress Measurement and Underground Engineering

    By Ding Xu Chu

    There are many methods developed for measuring the crustal stress in China. Among them only two methods have been adopted in practice, i.e., overcoring method (for which the sensors include: Piezo-mag

    Jan 1, 1987

  • SME-ICGCM
    Application of Tensioned Cable Bolts for Supplemental Support

    By Ben Mirabile, Alan Campoli, Rodney Poland

    "The majority of U.S. underground coal mines use some form of cable bolt as supplemental support to a primary roof bolting system. Many coal operators employ the high load capacity of non-tensioned ca

    Jan 1, 2010

  • SME-ICGCM
    Shield Monitoring To Forecast Severe Face Weightings At The South Bulga Colliery, NSW, Australia

    By Jim Sandford

    The South Bulga Colliery longwall operation, owned and operated by Cyprus Coal Australia. Oakbridge Pty. Ltd., and located near Singleton, NSW, is currently operating under an average 80-ft-thick (24-

    Jan 1, 1999

  • SME-ICGCM
    Effects of Bolt Spacing, Bolt Length, and Roof Span on Bolt Loading in a Trona Mine

    By Steve P. Signer

    Researchers from the Spokane Research Laboratory of the National Institute for Occupational Safety and Health installed 39 instrumented, fully grouted bolts at six test sites in a trona mine retreat p

    Jan 1, 2001

  • SME-ICGCM
    Shear Bond Stresses Along Cable Bolts

    By Hani S. Mitri

    The behaviour of grouted cable bolts used for rock reinforcement as a means of ground control in hard rock mining is investigated. The study utilizes an analytical model which is based on the variatio

    Jan 1, 1990

  • SME-ICGCM
    Mining-Induced Stress Measurement With Hydraulic Borerole Pressure Cells

    By Paul A. Lu

    This paper proposes an unconventional, simple, and practical method of measuring mining-induced around stresses with hydraulic borehole pressure cells. The method is a direct ground stress measuring t

    Jan 1, 1984

  • SME-ICGCM
    Integrity Factor Approach to Assess the Stability of Room-and-Pillar Mines

    By Kanaan Hanna

    The integrity factor approach was developed by the Bureau of nines to assess the stability of mine pillars and has been applied primarily to longwall chain pillars. Recently this approach was applied

    Jan 1, 1988

  • SME-ICGCM
    Aerostatic Support System For Underground Coal Mines

    By R. J. Morrell

    The Bureau of Mines developed a ground support system for use with an underground coal auger. The system consists of inflatable airbags that are inserted in the holes as they are drilled, and then gra

    Jan 1, 1988

  • SME-ICGCM
    A Study of Potential Fault Reactivation and Water Intrusion at a Longwall Coal Mine in Appalachia

    By Francis Kendorski

    A longwall coal mine in Appalachia about 1,500 ft deep encountered a fault while developing a new longwall panel. The fault extended from mining depth to the surface near a secondary road and drainage

    Jan 1, 2003

  • SME-ICGCM
    Prevention. Control and Management of Coal and Gas Outbursts

    By Lu Jiam Zhang

    Coal and gas outburst is one of the serious natural disasters in the coal mines of China. Since 1950, more than 10,000 coal or gas outbursts have occurred in more than 200 underground coal mines of di

    Jan 1, 1987

  • SME-ICGCM
    An Engineering Analysis Of "Squeeze" Failure Of Pillars In The Pittsburgh Coal Bed

    By George Mishra

    In mid-1979, J&L Steel Corporation experienced rapid failure of pillars after only two weeks' operation with a combination of full retreat and partial mining in the 154 Road Section of its Nemaco

    Jan 1, 1981

  • SME-ICGCM
    Remote Detection Of Abandoned Mine Workings Using Radio Imaging Method Techniques

    By James G. Schotsch

    Unmapped abandoned mines are hazards for under¬ground mines, surface mines and surface structures. The Radio Imaging Method (RIM) provides a cross borehole technique to remotely detect abandoned mine

    Jan 1, 1990

  • SME-ICGCM
    Mathematical Modeling Of Strong Roof Beds In Longwall Mining

    By Xiaolin Wu

    Most coal bump occurrences in the U.S. are directly related to mining operations under strong roofs. An understanding of the behavior of bridging or cantilevering strong roofs over working longwall fa

    Jan 1, 1993

  • SME-ICGCM
    Support Resistance And Roof Behaviour Of A Longwall Face With 4-Leg Shields

    By S. S. Peng

    The hydraulic powered supports have been employed in U. S. longwall mining for the past two decades. Yet the sciences of roof control at the powered supported faces remain largely unknown. In order to

    Jan 1, 1982

  • SME-ICGCM
    Analysis Of Cable Bolt Performance Using Numerical Modeling

    By M. Bouteldja

    A finite element modelling approach is developed for the evaluation of the mechanical performance of cable bolts supports in underground mine structures. The modelling approach permits the simulation

    Jan 1, 1999

  • SME-ICGCM
    How To Cope With Cutter Roof Problem (e6639bdb-2d11-4a70-a3df-8a3a479f7b3e)

    By A. Wahab Khair

    This paper presents results of the experiments carried out in Beth Energy No. 33 Mine for the purpose of alleviating problems associated with cutter roof. Cutter roof problems have delayed the advance

    Jan 1, 1992