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  • 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
    Continuous Improvement In Cuttable Coal Rib Support In Australian Coal Mines

    By Ghassan Skybey

    Australian coal mines uses state of the art technology in coal rib reinforcement. This paper highlights the development over the past 15 years in coal rib support technology, along with the advantages

    Jan 1, 1995

  • SME-ICGCM
    Proposed Criteria For Subsidence Damage To Buildings (d2ee0f1e-295b-4fb1-ab17-d19f1e17df4a)

    By Swapan Bhattacharya

    United States federal and state regulatory authorities require underground mine operators to adopt adequate measures to minimize material damage to the surface caused by nine subsidence. This paper pr

    Jan 1, 1984

  • SME-ICGCM
    Non-confirmation Mathematics for Wall Rock Classification for Mine Support

    By Guangyi Sun

    Wall rock classification method for coal mine support is the main factor affecting mine support. It is greatly affected by the combined effect of randomness, fuzziness and human being's incomplet

    Jan 1, 2005

  • SME-ICGCM
    Application Of Time Domain Reflectometry To Mining

    By Kevin M. Connor, Malcolm J. McPhersqn

    Examples are presented in which Time Domain Reflectometry (TDR) was employed to locate deformation of rock masses induced by mining. The first example involved motoring the propagation of overburden f

    Jan 1, 1984

  • SME-ICGCM
    Potential Of A Void Diffusion Model To Predict Longwall Subsidence In The Illinois Coal Basin

    In this paper, the authors attempt to apply a simplified non-homogeneous void diffusion model (NHVDM) to predict surface subsidence for longwall mining in Illinois. A generalized error function subsid

    Jan 1, 1990

  • SME-ICGCM
    Requirements and Performance of Pumpable Cribs in Longwall Tailgate Entries and Bleeders

    By Peter Zhang

    Pumpable cribs are being increasingly used in longwall tailgate entries and bleeders for roof support under abutment pressure. Their high peak capacity and confinement-controlled yield characteristics

    Jan 1, 2012

  • SME-ICGCM
    Field Experience Of Measuring The Acoustic Energy From A Hammer Blow To Coal Mine Roof And Its Relationship To Roof Stability

    By Peter Altounyan

    The rate of decay of the energy from a hammer blow to a coal mine roof is related to the size and nature of the contacts between the rock being struck and its surroundings The use of this principle as

    Jan 1, 2000

  • SME-ICGCM
    Control of Hard-to-Collapse Massive Roofs in Longwall Faces Using a Hydraulic Fracturing Technique

    By Hideki Shimando

    Periodic weighting and windblast which are caused by the dynamic effects of overburden in a longwall panel significantly affect longwall mining This study describes past experience with wind blast

    Jan 1, 1998

  • SME-ICGCM
    A Study On Stress Distribution And Reasonable Size Of Coal Pillar In A Coal Face

    By H. C. Li

    Mechanical models are established in accordance with the degree of mining on both sides of the coal pillar, and formulae were derived which calculated the superposition stress distribution and the wid

    Jan 1, 1992

  • SME-ICGCM
    Factors Influencing the Occurrence of Coal Pillar Bumps at the 9-Right Section of the Olga Mine

    By David C. Oyler

    The Bureau of Mines conducted research at the 9-Right Section of the Olga Mine to determine the cause of bumps and aid in the development of appropriate control techniques. The purpose of this paper i

    Jan 1, 1987

  • SME-ICGCM
    Surface Fracture Development From Mine Subsidence In Eastern Kentucky

    By Clyde DeRossett

    Surface fractures, sometimes of significant size, are observed in eastern Kentucky over high extraction areas. Field observations were correlated with mine maps and a regional subsidence prediction co

    Jan 1, 1993

  • SME-ICGCM
    Application Of A Simplified Three-Dimensional Roof-Pillar-Floor Interaction Analysis Model For Subsidence Prediction

    By Witold M. Pytel

    A simplified, three-dimensional, time-dependent, mechanistic model of the overburden-coal seam-floor interaction has been developed and validated at two Illinois coal mines. The model based on the thi

    Jan 1, 1992

  • SME-ICGCM
    Application Of Short-Term Time-Dependent Plate Loading Tests For Estimation Of In-Situ Elastic And Viscous Parameters Of Weak Floor Strata

    By Gang Chen

    This paper explores the possibility of using short-term time-dependent plate loading tests to estimate the elastic and viscoelastic parameters of the weak floor strata typically associated with coal s

    Jan 1, 1990

  • SME-ICGCM
    Pillar Optimization For Initial Design And Retreat Recovery

    By Charles Steed

    The design of pillars in room and pillar operations is always a compromise between factor of safety and ore recovery. In actively mined and accessed areas the stability of pillars must be sufficient t

    Jan 1, 2003

  • SME-ICGCM
    Coal Pillar Life Prediction in the Vaal Basin, South Africa

    By J. Nielen van der Merwe

    This investigation was done to develop a method to predict the lie of coal pillars. It has long since been known that coal pillars deteriorate over time, but there was no method to quantify the deteri

    Jan 1, 1998

  • SME-ICGCM
    Comparative Studies In The Mechanics Of Grouted Roof Bolts

    By Stephen P. Signer

    To improve the understanding of the support interaction mechanics between grouted bolts and coal mine roofs and to help lay the foundations for improved design and evaluation techniques, the 0.8. Bure

    Jan 1, 1988

  • SME-ICGCM
    An Analysis Of Longwall Shield Cycle Effectiveness By Polycorder Monitoring

    By Greg Hendon

    Various methods have been used to evaluate the effectiveness of shields in place. The most common method used is static recording of leg pressures by visually examining pressure gauges. In an effort t

    Jan 1, 1990

  • SME-ICGCM
    Aspects of Chain Pillar Design in Relation to Longwall Mining

    By B Whittaker

    The paper examines the role of chain pillars in longwall mining layouts as used in several countries. The application of chain pillars in relation to their expected design role is discussed. An import

    Jan 1, 1987

  • SME-ICGCM
    Application of the Coal Mine Roof Rating, Derived from Drill Core, in the Roof Support Design of a Coal Belt Conveyor Tunnel

    By John Rusnak

    The Coal Mine Roof Rating (CMRR) is a practical rock mass classification system for use in design of mine openings. Data can be obtained for this purpose from exploration drill cores if simple geotech

    Jan 1, 1998