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  • SME-ICGCM
    Longwall Pace Bursts and Inadequate Caving: A Came Study

    By K. Y. Haramy

    Deep coal mines with strong roof and floor strata frequently encounter face and rib bursts. The burst problem becomes more severe with increased depth. While the exact causes of bursts are often diffi

    Jan 1, 1987

  • SME-ICGCM
    A New Method For Longwall Pillar Design

    By P. Tsang

    In order to deal with ground control problems such as roof falls, floor heaves and pillar failures in underground coal mines, a new pillar design method based on the "yield pillar" concept is proposed

    Jan 1, 1993

  • SME-ICGCM
    Determining Horizontal Stress Direction Using The Stress Mapping Technique

    By T. P. Mucho

    Mine roof failure due to excessive horizontal stress has been recognized as a major cause of hazardous roof conditions in some mines. Stress measurements gathered by the U.S. Bureau of Mines (USBM) at

    Jan 1, 1994

  • SME-ICGCM
    Analysis of Panel Stability for Post-Mining Slurry Injection

    By Tim Ross

    Slurry injection into mined-out panels is an attractive alternative for disposal of coal preparation plant fines. however, in areas where surface subsidence cannot be tolerated, either by law or neces

    Jan 1, 1998

  • SME-ICGCM
    Scale Model Studies To Investigate The Effects Of Various Stressfields On The Stability Of Pillars Between Mine Roadways (359d84ec-978c-4bf2-a810-72bdf384bacc)

    By K. Goshtasbi Goharizi

    This paper discusses experimental results of physical scale models employed to study the stability of a pillar between rectangular roadways. A programme of laboratory investigations utilising a bi-axi

    Jan 1, 1992

  • SME-ICGCM
    Automated Temporary Roof Support Systems: An Update

    By William Gray

    It has been ten years since the Mine Safety and Health Administration (MSHA) promulgated a safety standard requiring the use of Automated Temporary Roof Support (ATRS) systems in underground coal mine

    Jan 1, 1998

  • SME-ICGCM
    Risk Assessment Of Geotechnical Factors Associated With Underground Thick Seam Mining Methods

    By Bruce K. Hebblewhit

    Australia is well endowed with extensive reserves of thick underground coal scams, particularly in the range of 4.5m to 9m thicknesses. (For the purposes of this paper, thick scams are defined as bein

    Jan 1, 2001

  • SME-ICGCM
    Numerical Modeling Of Longwalls In Deep Coal Mines

    By Salah Badr

    Longwall mine layouts with their entries, chain pillars, face support systems, advancing mining faces and compacting gobs represent a geomechanically complex mining operation. Geomechanical aspects ar

    Jan 1, 2003

  • SME-ICGCM
    Comparative Analysis Of Longwall Gateroad Designs In Four Deep, Bump-Prone Western U.S. Coal Mines

    By Matthew J. DeMarco

    Research personnel at the U.S. Bureau of Mines have conducted longwall gate stability studies at four western U.S. mines attempting to employ yield pillars for improved ground conditions. Located in t

    Jan 1, 1993

  • SME-ICGCM
    Subsidence Studies In Thick And Steep Coal Seam Mining

    By M. Y. Fisekci

    This paper concentrates on subsidence measurements, applied over the thick and steep seam mining in the Rocky Mountains Region of Western Canada. The studies to date indicate that two new subsidence m

    Jan 1, 1981

  • SME-ICGCM
    Vertical Stress Redistribution Around A Retreating Longwall Face End

    By D. A. Payne

    Large excavations, such as Iongwall panels, result in extensive vertical stress redistribution in the surrounding strata. The large abutment stresses developed may produce damage to pre-existing or pl

    Jan 1, 1995

  • SME-ICGCM
    Streams and Longwall Coal Mining Subsidence: A Pennsylvania Perspective

    By Anthony T. Iannacchione

    Longwall mining produces surface subsidence basins that affect streams by water diminution and contamination. These effects can ultimately impair the biological character of the plants and animal comm

    Jan 1, 2011

  • 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
    Drivage System In Retreat Longwall Gateroad

    By Kikuo Matsui

    In a difficult economic environment, the coal mines in Japan have been making extensive efforts in order to survive by rationalizing the mining operations. Introduction of a new longwall mining system

    Jan 1, 1995

  • SME-ICGCM
    Site Characterization For Ultra-Close Multi-Seam Mining

    By Yingxin Zhou

    Data from these field studies and previous case study data have been combined to define ultra-dose seam mining environments and relate them to observed failure conditions. A rating system for ultra-cl

    Jan 1, 1990

  • SME-ICGCM
    The Use Of Cribless Tailgates In Longwall Extraction

    By Russell Frith

    The paper defines the various operational advantages associated with the use of cribless tailgates during longwall extraction and considers the associated ground control issues that need evaluating to

    Jan 1, 2000

  • SME-ICGCM
    A Case History Investigation of Two Coal Bumps in the Southern Appalachian Coalfield

    By David Newman

    The Southern Appalachian coalfield has a long history of coal bumps that are attributable to a unique combination of topography, geology, and multiple seam mining. The high pillar stresses that genera

    Jan 1, 2002

  • SME-ICGCM
    Effects Of Bedding Plane Sliding And Separation And Tensioned Bolt In Layered Roof

    3-D finite element modeling was performed to study the effect of bedding plane sliding and separation and tensioned bolt in layered root It was found that the major influence zones of a tensioned bolt

    Jan 1, 2001

  • SME-ICGCM
    Evaluation of Anchorage Integrity for Grouted Bolts in Weak Strata

    By W. C. Smith

    Over the past several years, the Bureau of Mines has conducted studies on the performance of fully grouted resin bolts In underground mines. The effectiveness of resin-grouted bolts in maintaining a c

    Jan 1, 1987

  • SME-ICGCM
    Surface Flooding-Considerations For Mining Facilities Site Selection

    By Daniel S. Mazzei

    This paper will be a general discussion of surface flooding considerations as they affect mining facilities site selection, based primarily on experience with several such problems with which MSHA&apo

    Jan 1, 1982