Coal Engineering ›› 2022, Vol. 54 ›› Issue (2): 37-42.doi: 10.11799/ce202202007

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Surrounding Rock Control Technology of Soft Rock Roadway through Thick Coal Seam Fractured Roof Area in Deep Well

  

  • Received:2021-10-25 Revised:2021-11-08 Online:2022-02-14 Published:2022-07-06
  • Contact: Xiao DianCai E-mail:SKLXdiancai@126.com

Abstract: Aiming at the problem of surrounding rock control in deep soft rock roadway through thick coal seam cracked roof area, The characteristics of engineering failure are analyzed by field investigation,Combined with the analysis of borehole peep results,the reason for the deformation and instability of surrounding rock is concluded that the broken rock reduces the supporting performance of inner anchor net, fails to form a unified carrier with surrounding rock, the expansion of surrounding rock loose circle and uneven deformation lead to the decrease of supporting performance of U-shaped shed, Further lead to insufficient support resistance and the surrounding rock expands, until the destruction.In order to realize the secondary bearing capacity of the broken rock mass,A stable bearing structure is formed by modifying the broken surrounding rock and optimizing the stress of surrounding rock through pre-grouting and combination of metal framework,The supporting effect of inner anchor net is strengthened and the inner anchor is effective and the outer frame is reliable. Based on this, the combined control technology of "advance support + internal anchor and external frame combined control of roof +locking leg control of side wall + guniting and Grouting reinforcement+ Bottom plate water control and pressure relief groove relief " was proposed,The combined support system is formed, Including anchor solid and grouting rock mutually reinforcing, strong control of the roof, supplemented by control of the bottom; Through preliminary field engineering practice,good supporting effect has been achieved.

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