Coal Engineering ›› 2022, Vol. 54 ›› Issue (9): 35-40.doi: 10.11799/ce202209007

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Research on deformation characteristics of surrounding rock in isolated working face of xiagou coal mine and its repair and reinforcement

  

  • Received:2022-02-15 Revised:2022-05-07 Online:2022-09-15 Published:2022-10-09

Abstract: The serious deformation and breakage of roadway surrounding rock and the easy failure of the anchoring structure under mining in isolated working face of thick coal seam are the urgent issue which need to be paid more attention in the multiple seams by repeated mining. Based on this problem,the ZF303 transport tunnel of Xiagou Coal Mine is taken as test road-way.Then it determines the main factors affecting serious deformation on surrounding rock of transport tunnel trough surrounding rock analysis and on-site drilling monitoring. It has proposed the combined support technology of "anchor net cable + steel belt + metal net + grouting" to reinforce the channel on site, and proved the feasibility by Flac3D software simulation. The field monitoring results show that the maximum deformation of roof, floor and two sides in the tunnel grouting reinforcement section is significantly reduced compared with that in the unrepaired tunnel, Furthermore, the cracks in the surrounding rock are almost filled by grouting material, and the overall stability of roadway surrounding rock is completely achieved.

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