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  • SME-ICGCM
    A Methodology for Fault Pre-Consolidation prior to Longwall Retreat: A Case Study from Kestrel Coal

    By Dion Pastars

    Kestrel Coal has undertaken a surface-to-seam consolidation program of faulted ground prior to longwall retreat in the 304 panel. Micro fine cement is used to improve the rock mass quality and the

    Jan 1, 2007

  • SME-ICGCM
    Influence Of Support Capacity And Geometry On Tailgate Support

    By E. Hosca

    Alternative tailgate loading conditions due to conventional and conventional/yield pillar combinations were evaluated to define roof loading. In order to isolate different loading situations, the tail

    Jan 1, 1994

  • SME-ICGCM
    Mine Convergence When Using Mobile Roof Supports In Pillar Recovery

    By J. R. Stoltz

    To date, there has been limited formal research dealing with the use of Mobile Roof Supports (MRS) for pillar recovery. This paper, which is a portion of a larger project, presents convergence data fr

    Jan 1, 1999

  • SME-ICGCM
    A Decade of Mobile Roof Support Application in the United States

    By Larry Howe

    Second, or retreat mhng with Mobile Roof Supports (MRS) has now been part of coal mining in the United States for a decade Their utilization has evolved into mining applications which vary in seam hei

    Jan 1, 1998

  • SME-ICGCM
    Roof Screening: Best Practices and Roof Bolting Machines (e5909744-6953-4a41-b02f-21226966b63f)

    By Susan Robertson

    Many injuries are caused each year by rock falls in coal mines. Most of these injuries are not caused by major roof collapses, but from falls of smaller rocks from the immediate top or roof skin. Vari

    Jan 1, 2002

  • SME-ICGCM
    Investigation Of Pillar-Roof Contact Failure In Northern Appalachian Stone Mine Workings (55897abb-5ce0-4661-bf26-04d03fe5d67b)

    By Gabriel Esterhuizen

    The roof rock in underground limestone mines in Northern Appalachia can be subject to high horizontal stresses in spite of the shallow depth of the workings. The high stresses can cause roof stability

    Jan 1, 2004

  • SME-ICGCM
    Evaluation Of Existing Predictive Methods For Mine Subsidence In The U. S. (1ec2d374-5864-4775-9b19-24759c4f95be)

    By Vladimir Adamek

    Two existing predictive methods were chosen for evaluation; an influence function (Gals Theory) and a profile function (hyperbolic). These were applied to several field measured subsidence pro¬files o

    Jan 1, 1981

  • SME-ICGCM
    Utilization Of Polymer Grid Structures In Shield Recovery Operations

    By Brian E. Travis

    Recent Developments in the utilization of polymer grid structures for Longwall Shield Recovery operations are discussed. Specifically: various Longwall screen designs and the numerous methods employed

    Jan 1, 1993

  • SME-ICGCM
    Numerical Modeling the Interburden Impact on Multiple-Seam Coal Mining in Western China

    By Jimin Su, Enguang Zhu, Kangning Zhang, Yang Li

    "The effect of interburden on overlying strata movement during the mining of a lower group coal seam is still a challenge in China. Based on the multiple coal seams in western China, numerical simulat

    Jan 1, 2017

  • SME-ICGCM
    Rock Reinforcement Longevity

    By Francis S. Kendorski

    Rock reinforcement has been in widespread use and generally has been accepted in underground mining and tunneling since the 1950s. The first rock reinforcement technologies employed were mechanical an

    Jan 1, 2000

  • SME-ICGCM
    Investigation of Electromagnetic Emissions in a Deep Underground Mine (0366ea57-3ba7-4a00-bec7-825a048e7e26)

    By Douglas Scott

    Highly stressed rock in stopes continues to be a primary safety risk for miners in underground mines because it can result in failures of ground that lead to both injuries and death. Spokane Research

    Jan 1, 2004

  • SME-ICGCM
    Application Of DDM To Some Rock Pressure Problems In Japanese Deep Coal Mines

    By Yoshiaki Fujii

    Displacement Discontinuity Method (DDM), which was originally developed by Crouch,S.L., is a powerful tool to calculate mechanical disturbances due to tabular excavations. Three topics on DDM applicat

    Jan 1, 1992

  • SME-ICGCM
    Load Deformation Behavior Of Simulated Longwall Gob Material

    By Deno M. Pappas

    The purpose of this U.S. Bureau of Mines study was to determine the material stiffness properties of the gob for use in numerical models of rock mass response to longwall mining. Photographs of actual

    Jan 1, 1993

  • SME-ICGCM
    Field Measurements of Chain Pillar Response to Longwall Abutment Loads

    By Christopher Mark

    Current longwall pillar design methods are based on many assumptions about pillar and entry response to longwall abutment loads. Knowledge of the magnitude and time-of-arrival of abutment loads is ess

    Jan 1, 1986

  • SME-ICGCM
    The Impact Factors of Overburden Movement in Longwall Mining of Shallow Coal Seams

    By Yang Li

    For the study of overburden movement in longwall mining of shallow coal seams, most scholars merely consider the thickness of bedrock and top soils. In this paper, the overburden movement in longwall

    Jan 1, 2014

  • 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

  • SME-ICGCM
    Rigid Or Yielding Roof Bolts: At The Face Or Away From The Face (3eff2ffb-d0b3-4171-9439-10f9fdec54f7)

    By R. D. Lama

    The concept of rigid or yielding bolts is discussed based upon support requirements for excavations of equivalent geomechanical behaviour. The concept of equivalent geomechanical behaviour is introduc

    Jan 1, 1992

  • 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
    Laboratory and In Situ Results of a Slip Nut Yielding Rock Bolt System

    By John D. VandeKraats

    Yielding rock bolt systems have been developed to provide ground support while accommodating shifting, creeping, or swelling ground movements. The Dywidag Systems, Inc. (DSI) Slip Nut System is one su

    Jan 1, 1998

  • SME-ICGCM
    Mitigation of a Massive Sandstone Channel's Impact on a 1,500 Ft Wide Longwall Face

    By Daniel W. Su

    This paper presents the implementation and evaluation of the hydraulic fracturing technique and Longwall Visual Analysis (LVA) software to mitigate the impact of a 1,000-ft (305-meter) widemassive san

    Jan 1, 2012