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  • SME-ICGCM
    Investigation of Pillar Loading Considerations in Determination of Pillar Stability Factors for Longwall Gateroad Design

    By Heather E. Lawson

    Recent field data providing measured pillar loading from a deep western mine revealed that an increased load transfer distance existed compared to expected values (Larson et al., 2012). Additionally,

    Jan 1, 2013

  • SME-ICGCM
    Detailed Underground Measurements Of Roof Deflection And Bed Separation

    By André Vervoort

    To learn more about the fundamental roof behaviour in South African coal mines, accurate underground measurements of roof deflection were conducted in bord and pillar panels during development and pil

    Jan 1, 1992

  • SME-ICGCM
    Innovative Ground Support System (23660f1b-763d-4a59-bd83-98b27cd5764f)

    By P. A. Gray

    Artificial ground support has developed into a relined science over the past 20 years. From reactive support systems such as timber props and steel supports, to active systems such as roof bolts and c

    Jan 1, 1992

  • SME-ICGCM
    Longwall Roof Fall Prediction and Shield Support Recommendations

    By Ulrich Langosch

    In the 1990s the German mining industry introduced a new generation of shield supports. The new design of support has a maximum load capacity of 10,000 kN, making these units as strong as the shields

    Jan 1, 2003

  • SME-ICGCM
    An Analysis of Rock Failure Around a Deep Longwall Using Microseismics

    By Keith Heasley

    In this paper, a state-of-the-art, three-dimensional, full waveform, microseismic system was used to analyze the rock failure around a deep (> 750 in (2500 ft) of cover) bump-prone longwall panel. The

    Jan 1, 2001

  • SME-ICGCM
    Control Of Mine Subsidence Utilizing Coal Ash As A Backfill Material

    By D. W. Evans

    Mine subsidence problems due to coal extraction have occurred in a number of areas throughout the United States. Depending on the local geology, the depth of the mined seam, the type of mining method

    Jan 1, 1982

  • SME-ICGCM
    Tunnel Deformation Monitoring "Action Levels" In Coal Mines For Support/Reinforcement Design

    By Lorraine Kent

    Mine tunnel support using rockbolts was introduced in UK coal mines over the period 1987- 1992 and is now used in over 70% of all mine tunnels. In every case the reinforcement design has been based on

    Jan 1, 1999

  • SME-ICGCM
    Numerical Modeling of Stress Distribution of Gateroads Subjected to Dynamic Pressure of Longwall Mining in the Immediate Overlying Seam, a Case Study

    By Ximeng Li

    The entries that are subjected to dynamic pressure are much more difficult to maintain due to repeated disturbance. A case study of an entry stress distribution was performed using the FLAC3D program.

    Jan 1, 2013

  • SME-ICGCM
    Improved Roofbolting Methodologies: Reducing Hydraulic Fracture of Strata

    By David W. Evans

    "Induced hydraulic fracture of strata during roof bolt installation is a potentially prevalent, but masked phenomenon within the underground coal industry. Previously reported resin testing programs (

    Jan 1, 2015

  • SME-ICGCM
    User-Friendly Finite Element Design of Main Entries, Barrier Pillars, and Bleeder Entries

    By William G. Pariseau, Mark K. Larson, Douglas R. Tesarik, Heather E. Lawson

    "This contribution describes development and application of a user-friendly finite element program, UT3PC, to address three important problems in underground coal mine design: (1) safety of main entri

    Jan 1, 2017

  • SME-ICGCM
    Analysis of Gateroad Stability at Two Longwall Mines Based on Field Monitoring Results and Numerical Model Analysis

    By David F. Gearhart, Mark Van Dyke, Heather Dougherty, Ted Klemetti, Gabriel S. Esterhuizen

    "Coal mine longwall gateroads are subject to changing loading conditions induced by the advancing longwall face. The ground response and support requirements are closely related to the magnitude and o

    Jan 1, 2018

  • SME-ICGCM
    A Survey of the Current Rib Support Practices and Techniques in U.S. Coal Mines

    By Khaled M. Mohamed, Michael M. Murphy, Ted M. Klemetti, Heather E. Lawson

    "The design of rib support systems in U.S. coal mines is based primarily on local practices and experience. A better understanding of current rib support practices in U.S. coal mines is crucial for de

    Jan 1, 2015

  • SME-ICGCM
    Longwall Shield Recovery, Using Phenolic Foam Injection for Gob Control As An Alternative to Recovery Mesh

    By James D. Pile

    Following a methane ignition in the active panel of a longwall coal mine, the affected panel was successfully isolated from the rest of the mine. This allowed for the remainder of the mine to return t

    Jan 1, 2013

  • 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
    Three Dimensional Analysis of Strain and Ground Surface Displacement Caused By Underground Mining in the Vicinity of Geotechnical Barriers

    By Rafal Misa

    In order to prevent the formation of mining damage or to reduce its reach, it is advisable to look for technical solutions which would enable effective protection of construction sites from the impact

    Jan 1, 2014

  • SME-ICGCM
    A Roof Model and Its Application in Solid Backfilling Mining

    By Meng Xiao, Peng Huang, Lizin Lan, Feng Ju, Shuai Guo

    "Through changing the axial load on backfilling material compaction test to reflect different overlying strata pressure on backfilling material, the stress-strain relations in the compaction process o

    Jan 1, 2016

  • SME-ICGCM
    Deformation Mechanism and Floor Heave Control Technology in Deep? Buried Full Seam Chamber

    By Xicai Gao

    With the intensification and expansion of deep coal mining, the surrounding rock stress environment becomes further deteriorated because of the complicated geological environment and powerful mining e

    Jan 1, 2013

  • SME-ICGCM
    Ground Control of Longwall Top–Coal Caving Faces within Thick Coal Seams

    By Jinwang Zhang, Zhaohui Wang, Jiachen Wang

    "Thick coal seams (seam height larger than 3.5 m) account for a large portion of the proven coal reserves of China, and underground thick coal seam mining provides about 50% of the Chinese annual coal

    Jan 1, 2017

  • SME-ICGCM
    Support Strategy for Tailgates below Gob Edge Using Split-Level Longwall Panel Layout for Deep Inclined Coal Seams

    By Pengfei Wang, Guorui Feng

    With increase of cover depth, dynamic incidents, such as large gateroad convergences and coal bursts, are frequently encountered when mining deep longwall panels. It would be more adverse due to large

    Jan 1, 2018

  • SME-ICGCM
    Variation In The Load Transfer Of Fully Encapsulated Rockbolts

    By Paul Hagan

    A diverse range of rockbolt designs and resin anchors are available for use in underground mines. Despite their wide spread use, the factors that affect the performance a rockbolt is not fully underst

    Jan 1, 2004