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  • SME-ICGCM
    The Quasi-Protection-Layer Model and Its Mechanisms of Gas Drainage

    By Liu Xiao, Lin Xiaoying, Ma Geng, Tao Yunqi

    "The soft coal in China has several issues, low permeability, high gas content and prone to gas outburst, making it difficult to drill and improve its permeability. Using the rock mass loading test, t

    Jan 1, 2016

  • SME-ICGCM
    A Case Study Of A Deformation Mechanism Around A Two-Entry Gate-Road System Involving Probable Time-Dependent Behavior

    By M. K. Larson

    The U.S. Bureau of Mines and Cyprus Shoshone Coal Corp. conducted a study of deformation mechanisms around a longwall gate-road system in an underground coal mine. Of particular interest was roof defo

    Jan 1, 1995

  • SME-ICGCM
    The Interaction of Unique Geology and Retreat Room?and?Pillar Mining on Overburden Barrier Performance at the Grove No. 1 Mine

    By Anthony T. Iannacchione

    This study, funded by the Appalachian Research Initiative for Environmental Science (ARIES), examines how mine layout, mining method, and geology interacted to allow water from the Grove No.1 mine poo

    Jan 1, 2013

  • SME-ICGCM
    Further Improvements In The Roof Beam Tilt Method Of Gateroad Support Design

    By Peter Cain

    Twenty years of research into the design of permanent gateroad support (packs) in coal mines have resulted in two methods of pack design based on engineering principles. The first, the detached block

    Jan 1, 1993

  • SME-ICGCM
    Advanced Surveying Method For Measuring Roof Convergence

    By M. Zaki Rashad

    In this paper, if three slant distances are measured from three given points of known coordinates to an unknown point, the position of this point (X, Y, and Z coordinates) can be determined. A compute

    Jan 1, 1990

  • SME-ICGCM
    Economic Impact of Ascending Mine?Waters in Germany

    By Axel Preusse

    Due to a political decision, German hard coal mining will come to an end in the year 2018. By then, there will have been more than 150 years of industrial grade mining activities. Located in the weste

    Jan 1, 2013

  • 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
    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
    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
    Causes of Massive Directional Roof Falls in Room and Pillar Mines - Two Case Studies

    By S. S. Peng

    In recent years many roof falls have been conveniently attributed to the adverse existence of a high horizontal stress. The normal practice of not conducting a follow-up study in a roof fall investiga

    Jan 1, 1999

  • 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
    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
    Understanding the Causes of Roof Control Problems on a Longwall Face From Shield Monitoring Data ? A Case Study

    By Robert Trueman

    This paper details the results of an assessment aimed at understanding the shield loading mechanisms associated with strata-related issues on a longwall face. Shield load cycle analysis theories devel

    Jan 1, 2011

  • SME-ICGCM
    Visual Recognition of the Load of Roof-Bolts by an Indicator

    By Joachim Leonhardt

    Hundreds ofbolt-indicators were already used successfully in the German deep hard coal-mines to increase the safety and economy. The bolt-indicator offers the simple possibility to show roof-bolt (anc

    Jan 1, 2001

  • SME-ICGCM
    Mapping Hazards With Microseismic Technology To Anticipate Roof Falls - A Case Study (ac4523c6-7bdb-4660-a1cb-20433a65c0ed)

    By Anthony Iannacchione

    As the amount of new fractured surfaces or "damaged rock layers" within roof rock increases, the stability of the rock mass decreases. While direct measurements of this phenomenon are not easily made,

    Jan 1, 2004

  • SME-ICGCM
    Stress Control Method Applied to Stabilization of Underground Coal Mine Openings (e5cbe8ad-30a8-4144-a7b5-db19e81a247a)

    By Shosei Serata

    Serious floor heave of up to 2.4 m in a 2.4-m high mine entry was eliminated by applying the stress control method of mining, as a last resort, at the No. 5 coal mine of Jim Walter Resources, Inc., in

    Jan 1, 1984

  • SME-ICGCM
    In Situ Stress For Underground Excavation Design In A Naturally Fractured Rock Mass

    By Andrew J. Hyett

    The ISRM commission on testing methods has recently presented Suggested Methods for rock stress determination (Kim & Franklin, 1987). This proposes that even if the magnitude of in situ stress is not

    Jan 1, 1989

  • SME-ICGCM
    Modeling the Effect of Bolts on the Behavior of Rock Pillars and Associated Insights on Rib Reinforcement

    By Gabriel Walton, Sankhaneel Sinha

    "Rib failures are a major hazard in underground mining. When pillars are subjected to loading, extensile cracks are generated parallel to the excavation boundary, which can manifest as rib falls. A co

    Jan 1, 2017

  • SME-ICGCM
    Development and Evaluation of Corrosion Resistant Coating for Expandable Rock Bolt against Highly-Corrosive Ground Conditions

    By Kevin J. Ma, John Stankus, Dakota Faulkner

    "Expandable rock bolts are widely used in hard rock mines as an efficient ground control product. However, capacity and service life can be significantly reduced if the metallic body is subjected to c

    Jan 1, 2017

  • SME-ICGCM
    Successful Application Of Hydraulic Fracturing To Control Windblast Hazard At Moonee Colliery, NSW, Australia

    By Ken Mills

    This paper describes the first successful use of hydraulic fracturing to induce caving events "on demand" in Australia. Moonee Colliery operate a longwall immediately below a thick conglomerate strata

    Jan 1, 2000