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Open Access Development and application of ultrahigh-heat processed rock bolts

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In Chinese coal mine industry,most of rock bolts have a low load-bearing capacity and have no requirement for impact absorbing energy.An investigation of broken rock bolts was carried out in underground coal mines and it was found that the major reason of bolt failure was low tensile strength,high inclusion content,lack of impact toughness and impact-bearing capacity.Low impact toughness is the intrinsic reason for bolt broken.To overcome this problem,an ultrahigh-heat processed bolt was developed.The capacity of this type of bolts was evaluated by doing pull-load and twisting tests.The experimental results show that the ultrahigh-heat processed bolts exhibit higher load-bearing capacity comparing to conventional bolts.The coefficient of impact-absorbing energy of the ultrahigh-heat processed bolt is many times higher than that of the conventional bolts.The ultrahigh-heat processed bolts have been used for supporting a roadway subjected to dynamic stresses at Zhangchun Coal Mine in Lu’an.The pre-tension was between 52 to 98 kN and the monitored maximum load was 223 kN which was less than its broken load.The deformation of the roadway was efficiently controlled by the ultrahigh-heat processed bolts.
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Keywords: heat-treated material; high strength; roadway support; rock bolt; strong support

Document Type: Research Article

Publication date: February 15, 2015

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  • The Journal publishes the peer-reviewed papers with original research, new developments and innovations, site measurements and case studies in coal science and mining industry. It aims to be a leading platform for the publication of high quality papers and an authoritative source of information for analysis, review and evaluation related to coal science and mining technologies.

    The Journal covers the following areas:

    - coalfield geology and exploration
    - coal resources/reserves estimation
    - mine planning and design, mine optimization
    - mine construction and development, mine operation
    - mine electrical and equipment, mine automation
    - mine health and safety
    - ventilation and control, methane drainage and capture
    - coal processing and utilization
    - low carbon technology
    - coal economics, mine management
    - coal mine environmental impact assessment and control
    - mine rehabilitation, mine closure, etc.

    The Journal is a unique comprehensive academic periodical completely dedicated to the coal science and mining industry in the world. The Journal stands out as an excellent source of scientific information in coal industry with nearly 400 papers published in 12 issues per annum.

    The Journal is published monthly by China Coal Society.
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