Stress distribution and control technology for rock surrounding large-section pump caverns in deep mines

Xigui Zheng, W. Yue, S. Mao, X. Cheng

    Research output: Contribution to journalArticle

    Abstract

    © 2016 ejge.With regard to the technical problems concerning the control of rock that surrounds a large-section cavern in a deep mine, this paper examines the main drainage pump room on Plane IV of Kongzhuang Mine. The primary objective is to analyze the stress distribution in the rock surrounding the pump room and devise a control technology for it. Basic tests have been performed to explore the stress distribution and regional rock strength at the site. The method of "equivalent radius" is adopted to establish distribution rules for the stress and displacement field around the cavern. On this basis, an analytical expression for support resistance based on lining support is proposed. In addition, the three-dimensional finite element analysis software FLAC3D is employed to simulate the influence of different support forms and 2-5 m of grouting thickness on the rock surrounding the cavern. Simulations show that a 4 m grouting thickness leads to better control of the surrounding rock. As demonstrated by tests beneath the Kongzhuang Mine Well that drew support from composite support technology combining bolting-grouting with lining, the deformation of the cavern is less than 25 mm. The control effect is satisfactory.
    Original languageEnglish
    Pages (from-to)7641-7654
    Number of pages14
    JournalElectronic Journal of Geotechnical Engineering
    Volume21
    Issue number24
    Publication statusPublished - 2016

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