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  • SME-ICGCM
    Convergence Characteristics of the Rocks Surrounding the Tailgate Supported with Roof Bolts in the Fault-Affected Zone

    By Xinxian Zhai

    Jining No. 3 Coal Mine, a subsidiary of Yanzhou Coal Company Limited. China, is a super-large modern mine. The coal mine is not only the first one constructed with five-million tons of designed produc

    Jan 1, 2007

  • SME-ICGCM
    Horizontal Stress and Coal Mines: Twenty-Five Years of Experience and Perspective

    By G. J. Hasenfus

    Although theoretical and conceptual knowledge regarding the impact of horizontal stress on underground coal mining excavations have existed since at least the mid-1900s, it wasn?t until the late 1970?

    Jan 1, 2006

  • SME-ICGCM
    An Analysis Of Longwall Shield Cycle Effectiveness By Polycorder Monitoring

    By Greg Hendon

    Various methods have been used to evaluate the effectiveness of shields in place. The most common method used is static recording of leg pressures by visually examining pressure gauges. In an effort t

    Jan 1, 1990

  • SME-ICGCM
    Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment

    By Gabriel Esterhuizen

    Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage at stresses that are lower than one would otherwise expect. Th

    Jan 1, 2007

  • SME-ICGCM
    In-Situ Testing Of Roofex Yielding Rock Bolts In Coal Ribs (d7c8f4cb-6d76-4845-93df-11dd74a1d904)

    By Sean Harvey

    One of the manifestations of the dynamically induced failures in deep coal mines is the violent ejection of coal from the ribs. A possible protection against such failures is the use of a specificall

    Jan 1, 2009

  • SME-ICGCM
    Recent Trends of Coal and Gas Outburst Accidents in China

    By Ming Ju Liu

    China has been suffering from the most serious coal and gas outburst accidents. The situation has become worse than ever with the mining of deeper coal seams at higher production rates in a more compl

    Jan 1, 2008

  • SME-ICGCM
    25 Years of Progressive in Numerical Modeling for Ground Control ? What Have We Accomplished and Where Do We Go Next?

    By Keith A. Heasley

    Exactly 25 years ago this month (August 12, 1981), IBM introduced the ?Personnel Computer? with a 16 bit operating system called MS-DOS 1.0. Since then, Moore?s Law, which essentially states that

    Jan 1, 2006

  • SME-ICGCM
    Practical Strata Management, Beltana No. 1 Mine, Australia

    By Shane McDonald

    Australia produces approximately 84 million tonnes of coal per annum from 30 longwalls in New South Wales and Queensland, operating at an average depth of around 300m. Industry trends and expectations

    Jan 1, 2008

  • SME-ICGCM
    Correlation of Sonic Travel Time to the Uniaxial Compressive Strength of U.S. Coal Measure Rocks

    By David Oyler

    Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. Because sonic velocity logs are relatively inexpensive and easy

    Jan 1, 2008

  • SME-ICGCM
    Evaluation of Support and Ground Response as Longwall Face Advances into and Widens Pre-Driven Recovery Room (94eb68ca-11f6-41ed-b8a6-cb9b52889278)

    By Thomas Barczak

    A cooperative study was conducted with Emerald Coal Resources, L.P., an affiliate of Foundation Coal Corporation, and the National Institute for Occupational Safety and Health (NIOSH) to evaluate the

    Jan 1, 2007

  • SME-ICGCM
    Overburden Subsidence Characteristics When Mining in Weak Rocks and Subject to Special Mining Conditions

    By Wenquan Zhang

    Based on the mining and geological conditions of Wadong Mine, Longkou City, Shandong Province, China, a viscoelastic model with proper creep parameters was established. The 3-D ANSYS was used to simul

    Jan 1, 2006

  • SME-ICGCM
    New Developments In Headed Rebar Ground Support (e1369dc5-cd64-41ac-8b6d-861d8d628824)

    By Roland C. Walker

    Traditional headed rebar has existed in the mining industry as a ground support product for many years. The head of a rebar bolt is most commonly produced by hot upset die forging. Upset die forging

    Jan 1, 2009

  • SME-ICGCM
    The Development of Active Cable Anchors for Primary Supports in Coal Mines

    By Scott A. Shapkoff

    High strength cable strand supports are predominately used as a supplemental means of ground control in longwall and development operations in the U.S. The advantages of cable strand supports have bee

    Jan 1, 2006

  • SME-ICGCM
    Geotechnical Assessment Of Skin Reinforcement In Underground Mines (f05de68f-e8c8-43ca-aab9-9a65452cc10f)

    By Jan A. Nemcik

    Steel mesh has been used successfully for many years to control friable roof conditions and prevent loose roof and rib material from caving into the roadway. Despite its extensive use, the installati

    Jan 1, 2009

  • SME-ICGCM
    Progressive Hangingwall Caving And Subsidence Prediction At The San Giovanni Mine, Italy

    By R. Balia

    The upper part of the "Contatto Ovest" orebody, at the San Giovanni Pb-Zn sulphur mine (Sardinia, Italy), is mined by a sublevel caving method. With increasing mining depth, a progressive caving of th

    Jan 1, 1990

  • SME-ICGCM
    Aspects of Chain Pillar Design in Relation to Longwall Mining

    By B Whittaker

    The paper examines the role of chain pillars in longwall mining layouts as used in several countries. The application of chain pillars in relation to their expected design role is discussed. An import

    Jan 1, 1987

  • SME-ICGCM
    Effects of Specimen Age on the Uniaxial Compressive Strength and Moisture Content of Weak Coal Measure Rocks

    By Timothy Barton

    The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine design. While there are standardized procedures for how to conduct UCS

    Jan 1, 2008

  • SME-ICGCM
    Overmining In Kailuan, China Mining Area (d9eb7d79-18c1-4a77-a59a-53706a90764b)

    By Jun Han

    Coal has been mined in the Kailuan mining area for more than 130 years. The remaining reserves consist of, in large part, coals that would have been considered economically unminable or technically no

    Jan 1, 2009

  • SME-ICGCM
    Coal Bumps And Odd Dynamic Phenomena - A Numerical Investigation (70cea8ce-38a7-4c88-a596-77cf801d31b0)

    By Jeffrey K. Whyatt

    The Crandall Canyon accident investigation included an interesting and unexplained observation by rescuers that the ?barrier rib had shifted northward as a unit, as much as 10 feet.? This is not the

    Jan 1, 2009

  • SME-ICGCM
    An Innovated Self-Screwed Tube Bolting System(STBS) To Reinforce Stability Of Mine Entries (b3995592-5744-4f95-89d6-4030a00b69b4)

    By Xingtian Hui

    Due to variation in the geological natures of underground coal mines, especially when the entry?s roof/floor are soft and weak, it is vital to select an appropriate roof bolting system to ensure entry

    Jan 1, 2009