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  • SME-ICGCM
    Roof Behavior In South African Coal Room And Pillar Panels

    By Bruce W. Jack

    An extensive underground roof-monitoring program was conducted in order to determine the roof strata behavior under various conditions. In total 29 sites at 5 different collieries were monitored using

    Jan 1, 2000

  • SME-ICGCM
    Method Of Selecting Suitable Types Of Powered Supports At Longwall Faces

    By S. M. Hsiung

    A model (support selection model) for the selection of suitable types of powered supports under various geological conditions is proposed. This model is developed by evaluating the support, performanc

    Jan 1, 1988

  • SME-ICGCM
    Coal Bursts That Occur During Development: A Rock Mechanics Enigma

    By Christopher Mark

    Coal bursts are typically associated with highly stressed coal. Most bursts occur during retreat mining (longwall mining or pillar recovery) in highly stressed locations like the tailgate corner of th

    Jan 1, 2017

  • SME-ICGCM
    A Rock Mass Strength Concept For Coal Seams

    By George S. Kalamaras

    Coal strata strength is included as a vague term in most of the pillar design formulas, either as a questionable fraction of the intact coal strength or a size-dependent relationship for scaling down

    Jan 1, 1993

  • SME-ICGCM
    Effect Of Face Advance Rates On The Characteristics Of Subsidence Processes Associated With U.S. And German Longwall Mining Operations

    By Yi Luo

    Regulating the face advance rate in longwall mining operation can be an effective means to reduce the disturbance potential to surface structures associated with a longwall subsidence process. However

    Jan 1, 2001

  • SME-ICGCM
    Time Dependent Strength Of Coal Strata For Long-Term Pillar Stability

    By Z. T. Bieniawski

    A major study was performed on determination of long term strength of coal strata directed to the design of coal pillars to ensure their stability beyond the life-time of a mine. Based on field invest

    Jan 1, 1994

  • SME-ICGCM
    Hydrogeologic Effects Of Subsidence At A Longwall Mine In The Pittsburgh Coal Seam

    By Leslie Carver

    The effects of longwall mine subsidence on water resources were studied at a West Virginia coal mine (mine Z) by Carver (1994). Data were obtained for 137 domestic supply wells and springs and 12 base

    Jan 1, 1994

  • SME-ICGCM
    Practical Aspects Of Longwall Pillar Design

    By Christopher Mark

    The past decade has provided a wealth of practical experience with longwall pillar design. Design formulas developed specifically for longwalls have proven their value in numerous applications. Analyt

    Jan 1, 1990

  • 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
    Modern Geotechnical Exploration And Mine Design

    By Patrick S. Artrip

    A deep mining operation in the Lower Kelly (Imboden) seam in Wise County, Virginia experienced severe ground control conditions in its attempt to develop reserves situated under increasingly higher co

    Jan 1, 1993

  • SME-ICGCM
    Stooping Low Safety Factor Pillars at Goedehoop Colliery - 12 Months Later

    By Gift Makusha

    Pre-feasibility work at Goedehoop Colliery indicated that stooping of the undersized pillars could be undertaken safely and economically. In light of the findings a decision was taken in may 2003 to u

    Jan 1, 2004

  • SME-ICGCM
    The Influence Of Stream Valleys On Coal Mine Ground Control

    By John L. Hill

    Over 50 mines of the Appalachian and Illinois Basins are presently experiencing poor ground conditions believed to be caused by overlying stream valleys. The Bureau of Mines is conducting research int

    Jan 1, 1988

  • SME-ICGCM
    The Importance of Underground Stone Mine Roof Geology

    By Frank Kendorski

    Several startup or longtime underground stone mines have experienced unanticipated roof control difficulties due to the variable geologic character of the roof strata. Careful mapping of roof conditio

    Jan 1, 2002

  • SME-ICGCM
    Research on the rational structure of tensible rockbolt and the effect of surrounding rock reinforcement

    By Chao-jiong Hou

    The necessity of using tensible rockbolt in the roadway with soft rock, high in-situ stresses, mining influence and other complex conditions was discussed, the structures of three kinds of tonsibte ro

    Jan 1, 1989

  • SME-ICGCM
    MSHA Technical Review of Proposed Mine Designs for U.S.Underground Coal Mines

    By Michael Gauna

    Ground fall injuries and fatalities in United States underground coal mines have shown a diminishing trend. Advances in bolting and standing support systems have led to improved safety in underground

    Jan 1, 2011

  • SME-ICGCM
    Determination Of Plate Size Effect On Ultimate Bearing Capacity Of Weak Floor In Underground Coal Mines Using A Boundary Integral Approach

    By Zhanjing Yu

    In this paper, an equation is developed to characterize the relationship between the UBC and plate size using a boundary integral approach. The equation was validated by the results from mo& than seve

    Jan 1, 1993

  • SME-ICGCM
    Massive Pillar Failure--Two Case Studies

    By David H. Tang

    Similar massive pillar failures were observed in two underground coal mines with different configurations of mine workings and overburden depths. Finite element models were used to analyze the causes

    Jan 1, 1984

  • SME-ICGCM
    Tekflex As A Sprayon Screen Replacement In An Underground Hard Rock Mine

    By Chris Pritchard

    Falconbridge Ltd., a major base metal producer in the Sudbury Basin of Ontario, Canada, identified a need to find a safe and cost effective replacement for welded-wire mesh used to support loose groun

    Jan 1, 1999

  • SME-ICGCM
    Innovative Concept In Tailgate Entry Support: Elimination Of Crib Blocks Through Utilization Of New High Capacity Roof Truss Systems (3aab4965-6f53-4caa-9e67-bf9dbe5d5a16)

    By John C. Stankus

    In this paper, an innovative concept in longwall tailgate support is discussed. This new concept utilizes a new high capacity roof truss system in lieu of conventional wooden crib block. The first fie

    Jan 1, 1994

  • SME-ICGCM
    GIS Supported Evaluation of Surface Level Impacts Due to Abandoned Near?Surface Mine Locations

    By Alexander Kattner

    Surface fractures in urbanized areas show the risk potential of near-surface mining. This kind of mining subsidence damage occurs mainly in areas where hard coal was mined near the surface with very l

    Jan 1, 2011