Synergistic bearing mechanism and pre-tightening force analyzing pre-stressed bolt (cable) in coal mine roadway

Xigui Zheng, Y. Guo, K. Lu, S. Mao, X. Cheng

    Research output: Contribution to journalArticle

    Abstract

    Pre-stressed bolt (cable) has been widely used in deep coal mine, however, roof's stability in coal mine roadway troubled the safety of miners for a long time, which mainly induced by the synergistic bearing mechanism between bolt and cable, especially the reasonable matching of initial pre-stress. Combining roof's supporting design of roadway in deep coal mine, this paper analyzed problems exists in bolt's (cable's) synergistic coupling mechanism and its application. Based on the knowledge of function in pre-stressed bolt or cable, numerical simulation software FLAC3D worked together with synergistic theory and orthogonal test, then cable's optical supporting density and corresponding optical combination of pre-tightening force were obtained successfully for supporting rock with moderate stability in thousand-meter-deep coal mine. That is to say, 80kN at least for pre-tightening force in bolt can form stable pressure bearing layer in surrounding rock, and bolt's active supporting role also can be embodied, meanwhile, preferable synergy will emerge when cable's supporting density accounts for half of bolt's supporting density and value range 170~180kN is provided for pre-tightening force in cable simultaneously. Engineering practice verified the effects of anchoring system finally.
    Original languageEnglish
    Pages (from-to)6545-6558
    Number of pages14
    JournalElectronic Journal of Geotechnical Engineering
    Volume21
    Issue number19
    Publication statusPublished - 2016

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