Coal Engineering ›› 2024, Vol. 56 ›› Issue (7): 53-58.doi: 10.11799/ce202407009

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Research on open TBM tunneling technology and measures in broken strata of su-per-long inclined shaft in coal mine

  

  • Received:2023-09-03 Revised:2024-01-29 Online:2024-07-20 Published:2024-07-20

Abstract: Mine construction is the primary project of coal mining, and inclined shaft is one of the ways of mine development. Inclined shaft has the advantages of continuous main operation and no need for replacement. TBM has the characteris-tics of safe construction, high degree of automation and fast driving speed. TBM has become an important driving equipment for mechanization, automation and intelligent construction of inclined shaft engineering. The weakly con-solidated formation in western China has the characteristics of low strength of surrounding rock and poor bearing ca-pacity. It is easy for TBM to have such risks as cave-in, stuck machine, planting head and driving deviation when it passes through broken formation. Therefore, the research on open TBM driving technology and coping method of the broken stratum in the west coal mine is carried out. Based on the stratum and engineering conditions of the inclined shaft crossing in Kekegai Coal mine, the adjustment scheme of TBM driving parameters adapted to the stratum condi-tions is developed, and the control methods of cutter speed, boot pressure, cutter torque and advancing speed are put forward. This maximizes the performance of the TBM for efficient tunneling. The integrated surrounding rock rein-forcement methods such as steel arch, advance grouting and anchor mesh support are put forward when inclined shaft passes through broken stratum. The configuration scheme of auxiliary operation equipment and the flow of driving operation are optimized. The construction technology of broken stratum safety, which includes grouting reinforcement, strong support of surrounding rock and equipment coordination with excavation, guarantees the safety and fast excava-tion of the open TBM of broken stratum in Kekegai mine.

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