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  • 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
    Rockbolting For Highly Stressed Roadways

    By Holger Witthaus

    The conditions of great mining depth and multi-seam¬longwalling require a special method of rockbolting, It can be described as a control loop which is based on the elements of planning, drivage and m

    Jan 1, 2000

  • SME-ICGCM
    Effects of Panel Mining Sequence and Retreat Direction on the Roof Stability of Longwall Headgate Entries

    By Jinsheng Chen

    The major functions of longwall headgate entries are to provide access ways to the outby submains or mains for coal transportation and to the longwall face for fresh air and for transporting men and m

    Jan 1, 1998

  • SME-ICGCM
    Evaluation Of Surface Subsidence Potential Along A Pipeline Due To Abandoned Coal Mine Works

    By Thomas L. Vandergrift

    With the inevitable expansion of homes, businesses, and infrastructure in coal mining regions, the potential for future subsidence above abandoned mines is of increasing concern. Of particular concern

    Jan 1, 2000

  • SME-ICGCM
    An Approach To Identifying Geological Properties From Roof Bolter Drilling Parameters

    By Gerald I. Finfinger

    Identifying the properties of overlying rocks in underground mining operations is important to ensure the appropriate roof support design is used to maintain stability of the mine entries. Recently J.

    Jan 1, 2000

  • SME-ICGCM
    Design Considerations For Angle Bolters

    By Charles D. Albright

    FMC built its first angle bolter in 1969. This was a single mast unit which could drill holes for conventional bolts or angle holes for installing roof trusses. From this drill we learned very quickie

    Jan 1, 1982

  • SME-ICGCM
    Study of Ground Movement Over a Longwall Mine

    By A. W. Khair

    This paper presents an analysis of ground movements recorded from longwall operations in the Northern Appalachian region in West Virginia. The site chosen for the investigation was selected due to var

    Jan 1, 1987

  • SME-ICGCM
    Ground Control Experiences in a High Horizontal Stress Field at Inland Steel Coal Mine NO. 2,

    By C. Thomas Blevins

    This paper is intended to be a hands on experience account about ground control in a Southern Illinois coal mine. Its aim is to show how a combination of real world mining practices and constraints al

    Jan 1, 1984

  • SME-ICGCM
    Analysis of a Stability Problem in an Underground Coal Mine Due to Floor Conditions

    By M Nombe

    Based on the analysis of a case study at POWELTON No.2 MINE, it was determined that mine stability problems had occurred due to floor softening. A fireclay (underclay) layer in the immediate floor was

    Jan 1, 2002

  • SME-ICGCM
    Truss Bolting On-Cycle in Jane Mine Lower Freeport Seam

    By Ken Barish

    Jane Mine of the Keystone Coal Mining Corporation was started in 1962 and is in the Lower Freeport seas located in Armstrong County, Pennsylvania, approximately 45 miles northeast of Pittsburgh. The

    Jan 1, 1984

  • SME-ICGCM
    Load And Convergence Measurements In Longwall Faces And Design Guidelines For Face-Support Systems

    By Reha Ozel

    The stability in longwall faces depends on the interaction beman the roof strata, face supports and floor strata. The load distribution on the other hand, depends upon relative stiffness of the three

    Jan 1, 1990

  • SME-ICGCM
    Utilizing The ?Advance And Relieve? Method To Reduce Horizontal Stress Affects On The Mine Roof, A Case Study (b5b945af-699f-46b0-ae56-a98434baad9f)

    By Dennis R. Dolinar

    A room and pillar coal operation in central Pennsylvania was experiencing roof cutters and long running roof falls caused by high horizontal stresses. The roof conditions created hazards for the miner

    Jan 1, 2000

  • SME-ICGCM
    Investigation of Subsidence Over AML: A Case Study

    By P. M. Lin

    The problem of abandoned mine land (AML) subsidence is getting more severe because abandoned mine lands which used to be located in the remote areas have been gradually developed into suburbs or even

    Jan 1, 1987

  • SME-ICGCM
    Some Technical Considerations When Mining Under Bodies Of Water

    By John W. Fredland

    Conducting mining operations under a body of Water can create hazardous conditions for miners. The potential for a sudden inrush must be considered and abnormal ground control conditions can be encoun

    Jan 1, 1982

  • SME-ICGCM
    Prediction Of Rock Cutting Performance Using Fracture Mechanics Principles - A Review (0b1a12ed-9606-4d46-b68d-eea006d52e76)

    By Gexin Sun

    This paper overviews the recent research progress in predicting cutting performance using fracture mechanics principles. It is emphasised that rock fragmentation due to cutting is mainly a process of

    Jan 1, 1992

  • SME-ICGCM
    Application Of A Static And Geophysical Monitoring System For Detection Of Stability Problems

    By Maleki. Hamid

    The U.S. Bureau of Mines implemented an inte¬grated static and geophysical monitoring program in a southern Wyoming mine to study changes in seismic wave propagation properties in roof strata. The pur

    Jan 1, 1993

  • SME-ICGCM
    Case Studies Using Mine-Wide Monitoring Systems For Geotechnical Evaluations

    By John P. Dunford

    U.S. Bureau of Mines researchers are investigating the ability of mine-wide monitoring systems already in place at many coal operations to provide a direct link between geotechnical instruments and th

    Jan 1, 1993

  • SME-ICGCM
    Design Of Shield Supports For The U.S. Coal Mining Industry

    By Alan Peacock

    Shield supports have been in use in the USA underground mines since 1975, and their development in the intervening time has been progressive and inovative. Specialized techniques are used to optimize

    Jan 1, 1981

  • SME-ICGCM
    Longwall Surface Subsidence Prediction Through Numerical Modelling

    By Noor Mohammad

    Comprehensive numerical modelling of the subsidence associated with longwall mining in UK Coal Measures strata has been conducted and validated against UK data. The Rock Mass Classification System (RM

    Jan 1, 1997

  • SME-ICGCM
    Safe Pillar Extraction Practice - Some Geotechnical Principles Based on Australian Experience

    By Bruce K. Hebblewhite

    Underground pillar extraction continues to be practiced in Australia in various forms, in spite of the dominance of the longwall method, which accounts for over 90% of underground production. Australi

    Jan 1, 2011