强扰动底煤回收工作面巷道布置及其支护方式研究

STUDY ON ROADWAY LAYOUT AND SUPPORTING METHOD OF HIGH INTENSITY MINING DISTURBANCE BOTTOM COAL RECOVERY WORKING FACE

  • 摘要: 为了解决下沟矿强扰动遗留底煤回收的巷道布置及其支护方式的设计难题,通过理论分析、数值模拟的方式研究了上分层采后下分层巷道布置合理错距、不同错距下巷道的应力分布规律,最终确定了合理外错距,并基于下沟矿404采区的实际工况,提出了相应的巷道支护方案,最终通过数值模拟和现场实测的方法对巷道布置及其支护方式进行了验证。结果表明:在上分层强扰动影响下,底煤回收的巷道布置方式宜采取外错布置的方式且合理外错距为6 m。此时,巷道在扰动影响下围岩应力波动、应力分布非均匀程度和变形均匀程度均满足生产需要,说明外错6 m布置及其巷道支护方式较合理,对类似工程条件下巷道布置及支护有借鉴意义。

     

    Abstract: To address the design challenges of roadway layout and support mode for recovery of bottom coal left by strong disturbance in Xiagou Mine, this paper studies the reasonable staggered distance of roadway layout after upper slicing mining and the stress distribution law of roadway under different staggered distances by theoretical analysis and numerical simulation. The study determines an optimal external offset and proposes a corresponding roadway support scheme based on the actual working condition of 404 mining area in Xiagou Mine. The roadway layout and support mode are verified via numerical simulation and field measurement. Results show that under the influence of strong disturbance from the upper layer, the roadway layout for bottom coal recovery should adopt an external staggered layout, with a reasonable external staggered distance of 6 m. At this distance, the stress fluctuation of the surrounding rock, the non-uniformity of stress distribution, and the deformation uniformity of roadway under disturbance meet production requirements. Ihe findings confirm that a 6-meter layout combined with the proposed roadway supporting method is reasonable, providing valuable references for roadway arrangement and support under similar engineering conditions.

     

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