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  • SME-ICGCM
    Chinese And North American High-Extraction Underground Coal Mining Strata Behavior And Water Protection Experience And Guidelines

    By Mao Bai

    Mining in situations where there exists a potential hazard from inundation has always existed in coal mining, and often reserves were left unmined in favor of reserves with no such hazard. However, in

    Jan 1, 1995

  • SME-ICGCM
    Drag Picks - Influence Of Tool Geometry And Angle Of Arrack On The Stress Evolution And Cutting Efficiency

    During the last decade mechanical rock excavation has become increasingly widespread in the mining industry and, more in general, in excavation engineering. This technology, especially the tools and t

    Jan 1, 1990

  • 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
    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
    How to Design an Efficient Roof Bolting Plan Based on Simple In-Mine Measurements

    By C. J. H. Brest van Kempen

    The techniques developed should provide a useful tool, not only during the initial formulation of a suitable bolting plan for a new section, but also for periodic check¬ing on the utilization factor

    Jan 1, 1986

  • SME-ICGCM
    Assessment Of Applicability Of Strength Criteria For Rock And Rock Mass To Coal Pillars

    The applicability of four empirical strength criteria for rock masses, namely, Hoek and Brown, Bieniawski - Yudhbir et al., Rarnamurthy - Arora and Johnston - Sheorey et al. has been tested against th

    Jan 1, 1992

  • SME-ICGCM
    Methods of Controlling Hard Roof in a Longwall Face

    By Linsheng Xu

    When coal seam is under the integral thick sandstone (or conglomerate), the structure of thick sandstone is integral and its strength is rather high. After coal is extracted, the roof is hanging and c

    Jan 1, 1986

  • SME-ICGCM
    Longwall Production, Maintenance, And Roof Control System

    By W. Mark Hart

    The current Automatic Data Acquisition system developed by some support manufacturers make it possible to monitor and record changes in leg pressure, DA RAM stroke in every shield and shearer position

    Jan 1, 1994

  • 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
    Reformation Of The Hydraulic Stowing Mining Method (81b9f573-b6ec-447f-bbcd-728c29bd41c4)

    By Liang Yinhuai

    The hydraulic-stowing mining method is most effective for mining thick coal seams. It is superior to the sliced cover-caving and artificial mining method and the fully mechanized sublevel-caving minin

    Jan 1, 1992

  • SME-ICGCM
    Automation Of A Progressive Failure Procedure For Analysis Of Underground Mine Pillar Designs

    By N. P. Kripakov

    The U.S. Bureau of Mines (USBM) is conducting research to develop a practical computer-based tool that will allow coal mine planners to anticipate rock mass behavior surrounding mine entries prior to

    Jan 1, 1994

  • SME-ICGCM
    In-Situ Investigation Into The Causes Of Falls Of Roof In South African Collieries

    By J. Nielen van der Merwe

    The main objective of the research described in the paper was to determine the causes of falls of roof in South African coal mines. The south African Colliery Manager's Association and the member

    Jan 1, 2001

  • SME-ICGCM
    Renewed Interest In Prop Supports As A Replacement For Wood Cribs

    By Thomas M. Barczak

    Wood cribs have been the dominant form of supplemental support in coal mining for many years. Recently, there has been a renewed interest in prop supports as a replacement for wood cribbing due to the

    Jan 1, 1995

  • SME-ICGCM
    Effect of High Horizontal Stress on Coal Mine Entry Intersection Stability

    By K. Hanna

    This manuscript describes an extensive ground control study at the Inland Steel No. 2 Mine near McLeansboro, IL, conducted by the U.S. Department of the Interior's Bureau of Mines (USEM) in coope

    Jan 1, 1986

  • SME-ICGCM
    Design Considerations For Bump-Prone Longwall Mines

    Tailgate pillar and tailgate-face corner humps have been a major threat to longwall coal mines where hump-prone conditions exist. The yield pillar design concept, in which the longwall chain pillars a

    Jan 1, 1999

  • SME-ICGCM
    Comparison of Acoustic Emission and Stress Measurement Results to Evaluate the Application of the Kaiser Effect for Stress Determination in Underground Mines

    By Lorraine Kent

    Comparison of in-situ stress overcore measurement results with those determined from laboratory evaluation of Acoustic Emission (AE) testing on oriented sub-core samples has been carried out for a var

    Jan 1, 2002

  • 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
    Stability And Control Of Immediate Roof Of Fully Mechanized Coal Face

    By S. Y. Liu

    Based on the underground measurements, physical model test of simulated materials in the laboratory and finite element analysis, this paper demonstrates the pattern and process of roof fall over the t

    Jan 1, 1990

  • SME-ICGCM
    Geological Sensing - The Key To Increasing Miner Safety

    By J. R. M. Hill

    The U.S. Bureau of Mines is involved in research to improve geological sensing (or geo-sensing) techniques. This paper presents results from field trials of two research projects concerned with new te

    Jan 1, 1992