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  • SME-ICGCM
    Stress Variation on Longwall Powered Supports in Upper Seam due to the Presence of Old Mined Out Workings in Lower Seam

    By Vedala Sastry

    Longwall mining for coal extraction in deeper deposits is gaining momentum in India, due to the increasing stripping ratios and depletion of shallow deposits amenable for surface mining. In longwall

    Jan 1, 2007

  • SME-ICGCM
    Think Like a Roof Bolt ? Then Make It Scream ?

    By Greg Smith

    This paper documents the use of bench testing equipment developed to enhance the understanding of, and improve upon, common roof bolt support systems. Most roof bolt systems consist of components that

    Jan 1, 2012

  • SME-ICGCM
    Designing Free-Standing Steel Supports for Coal Mine Roof Support

    By Sam Spearing

    Free-standing supports are commonly used in coal mines in the USA, particularly when longwalling. A recent trend has been the development of prop supports. Prop supports have many advantages over bu

    Jan 1, 2008

  • SME-ICGCM
    Aspect Ratio and Other Parameters That Affect the Performance of Burrell Can Roof Supports

    By David F. Gearhart

    The Burrell Can1 is a thin, steel, tubular shell filled with aerated concrete that is used as a roof support in coal mines. The Can height is always shorter than the mining entry, so it is capped with

    Jan 1, 2012

  • SME-ICGCM
    Is Mining Coal at a 900M Below Surface at the Xuandong Coal Mine in China Challenging or Just Interesting Rock Mechanics?

    By Wouter Hartman

    Xuandong Coal Mine is mining coal in one of the most challenging underground environments in the world. This work has found that it is not only challenging but it also has the composition for some int

    Jan 1, 2012

  • SME-ICGCM
    Keynote Address at the 23rd International Conference on Ground Control in Mining, August 3-5,2004

    By Lewis Dr. Wade

    It is really an honor and pleasure to be here at the 231d International Conference on Ground Control in Mining. My name is Lew Wade. Until recently I served as the Associate Director of Mining for NIO

    Jan 1, 2005

  • SME-ICGCM
    Horizontal Stress and Coal Mines: Twenty-Five Years of Experience and Perspective

    By G. J. Hasenfus

    Although theoretical and conceptual knowledge regarding the impact of horizontal stress on underground coal mining excavations have existed since at least the mid-1900s, it wasn?t until the late 1970?

    Jan 1, 2006

  • SME-ICGCM
    Time-Lapse Tomography of A Longwall Panel: A Comparison of Location Schemes (919eac95-0539-40b5-9304-f250d4890ab6)

    By Kray Luxbacher

    Three-dimensional time-lapse velocity tomograms were generated to image stress redistribution around a longwall panel to produce a better understanding of the mechanisms that lead to ground failure.

    Jan 1, 2007

  • SME-ICGCM
    Application of Phenolic Foam in Longwall Mining

    By Marc Arl

    Failures of the face and roof above longwall shields have caused days and sometimes weeks of lost production. A common recovery method for these failures has been to pump light weight cementitious gro

    Jan 1, 2005

  • SME-ICGCM
    Overmining In Kailuan, China Mining Area (d9eb7d79-18c1-4a77-a59a-53706a90764b)

    By Jun Han

    Coal has been mined in the Kailuan mining area for more than 130 years. The remaining reserves consist of, in large part, coals that would have been considered economically unminable or technically no

    Jan 1, 2009

  • SME-ICGCM
    New Era in Longwall Top Coal Caving Geomechanics

    By Abouzar Vakili

    Longwall Top Coal Caving (LTCC), as the most attractive method for thick coal seams, has been suffering from insufficient geomechanical understanding for the past few years. Cavability without doubt

    Jan 1, 2007

  • SME-ICGCM
    Moonee Colliery: Renewing The Economic Viability Of A Mine Using Microseismic And Hydraulic Fracturing Techniques In Massive Roof Conditions

    By Peter Hayes

    Moonee Colliery operates a longwall extraction system in the Great Northern seam of the Newcastle Coal Measures, approximately 100km north of Sydney, NSW. In the initial mine area of longwall block

    Jan 1, 2000

  • SME-ICGCM
    Finite element analysis and comparison of shaly mine roof support systems

    By K. F. Unrug

    In the paper a numerical modeling method is used for evaluation of a roof support system, which is commonly used in the US coal industry. The effectiveness of mechanical roof bolting with or without,

    Jan 1, 1989

  • SME-ICGCM
    Design And Control Of Working Support In Polish Coal Mines Based On Three-Dimensional Numerical Modeling

    By Slawomir Bock

    One of the fundamental issues having a great influence on the safety of operations performed in underground mines is the support of workings which should assure their stability in a given geological s

    Jan 1, 2009

  • SME-ICGCM
    A Hydrogeomechanical Study Of Overburden Aquifer Response To Longwall Mining

    By G. J. Hasenfus

    This paper presents the results of an extensive hydrological and geomechanical monitoring program which Gas conducted at a longwall coal mine in W. Va. The field program included monitoring of groundw

    Jan 1, 1988

  • SME-ICGCM
    Effects of Transverse Isotropy on Vertical Stresses When Multi?Seam Mining under Supercritical Longwall Panels

    By Anastasia M. Suchowerska

    The design of effective ground support requires a sound understanding of the pre-mining state of stress in the stratum to be mined. Irregularities in the stress field encountered during multiseam mini

    Jan 1, 2012

  • SME-ICGCM
    Reflections on the Application of Geophysics to Ground Control

    By Peter Hatherly

    As a discipline, geophysics covers an enormous range of scales and applications - from planetary geophysics through to the monitoring of acoustic emissions of rock samples. Although it is not a core d

    Jan 1, 2006

  • SME-ICGCM
    Stooping Low Safety Factor Pillars At Goedehoop Colliery

    By Gift Makusha

    The Witbank Coalfield in South Africa contains up to five economically viable coal seams. These seams have been mined continuously for over 100 years and the reserve in now becoming depleted. The norm

    Jan 1, 2003

  • SME-ICGCM
    The Forensics Of Underground Roof Falls (c5c31282-77d4-44b1-8aa1-d01534eb267d)

    By Steve Tadolini

    Underground roof falls can have devastating effects on the safety of operations personnel, and equipment, and seriously impact production. Immediate steps are usually taken to danger off and secure t

    Jan 1, 2009

  • SME-ICGCM
    Determination of the Strength of Powered Roof Supports According for Fatigue Life

    By Monika Patrycja Polak - Micewicz

    This paper presents an approach for estimating the fatigue life for the base of powered roof supports (shield) manufactured by the FAZOS roof support company. FAZOS?s powered roof supports are designe

    Jan 1, 2012