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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (5): 57-66.doi: 10.11872/j.issn.1005-2518.2017.05.057

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Application of Steel Tube Confined Concrete Support in Jinchuan Mine

LI Guang1，MA Fengshan1，GUO Jie1，LU Rong1，CHEN Zhongjie2，KOU Yongyuan2   

  1. 1.Key Laboratory of Shale Gas and Geoengineering，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing    100029，China；
    2.Mining Area No.2 Jinchuan Group Co.，Ltd.，Jinchang    737100，Gansu，China
  • Received:2017-07-27 Revised:2017-08-18 Online:2017-10-30 Published:2018-02-12

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Abstract:

In order to solve the supporting issues of deep soft rock roadway in Jinchuan mine，the steel tube confined concrete supporting technique is used.Taking the 1 000 m tentative roadway in Jinchuan No.2 mine as a prototype，this paper applied a site monitoring and analyzed the surround rock deformation features under three different supporting conditions through FLAC3D software based on a full understanding of the engineering geological condition and the characteristics of roadway deformation under the previous support.The results show that：（1）The maximum surrounding rock displacement can reach 400 mm without support measures，and the displacement of two sides，roof and floor are large.The plastic areas distribution of surrounding rock is an approximate ellipse whose radius of longer axis is 15 m and the other is 9 m.（2）In the condition of composite supporting scheme of bolt-mesh-anchor and U-shaped steel，the maximum surrounding rock displacement is about 35 mm，the displacement of two sides are large，and deformations of roof and floor are controlled well.The plastic areas distribution of surrounding rock is much smaller than no supporting one.（3）In the condition of composite supporting scheme of bolt-mesh-anchor and STCCS（steel tube confined concrete support），the maximum surrounding rock displacement is about 28.5 mm which is reduced by about 20% compared with U-shaped steel support.The plastic areas distribution of surrounding rock is smaller and the roadway is more stable.（4）Both the results of field practice and numerical simulation show that the deformation of the roof is stable and two sides are large under the condition of STCCL.Therefore，STCCL can possess high load-bearing capacity and can be used as relatively reliable support for deep roadways，and the deformation of two sides should be paid more attention.

Key words: steel tube confined concrete support, roadway support, Jinchuan mine, roadway of deep mine, FLAC3D numerical simulation, deformation of surrounding rock

CLC Number: 

  • TD353

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