复合掏槽式精确爆破技术在巷道掘进中的应用研究

Application Research on Composite Cutting Type Precision Blasting Technology in Roadway Excavation

  • 摘要: 针对晋中天悦煤矿1305主运顺槽硬顶板、高地应力条件下,传统楔形掏槽工艺存在的循环进尺低、单位炸药消耗量高及轮廓控制精度差等问题,研发应用“中心大直径空孔+双侧聚能切缝”复合掏槽定向爆破技术。该技术通过构建150 mm中心卸压腔体,配合双侧42 mm聚能切缝孔实现“强力预裂-分区剥离”的定向破岩机制,优化周边孔径向不耦合与轴向间隔装药结构。工程实践结果显示,单循环进尺从2.8 m提升至3.2 m(增幅14.3%),月平均综合进尺由135 m跃升至230 m(增幅70.4%);单位炸药消耗量降至1.85 kg/m3,大块率(>0.5 m3)从20%以上降至8%以下;周边孔半孔痕率稳定在85%以上,平均超挖量从250 mm精控至80 mm以内。该成果有效突破高应力硬岩巷道掘进瓶颈,为同类工况下煤矿快速掘进提供了工程示范与技术参考。

     

    Abstract: In view of the existing problems of low cyclic footage, high consumption amount of explosive per unit, poor contour control accuracy and others in the traditional wedge-shaped cutting process under hard roof and high geostress conditions in the 1305 main transportation crossheading of Jinzhong Tianyue Coal Mine, a composite cutting directional blasting technology of "central large-diameter empty hole+double-sided energy gathering cutting seam" is developed and applied. This technology achieves a directional rock breaking mechanism of "strong force presplitting - zoning stripping" and optimizes the radial decoupled and axially spaced charge structures of the surrounding holes by constructing a 150 mm central pressure relief chamber and combining it with double-sided 42 mm energy gathering cutting seam holes. The engineering practice results indicate that the single cycle footage is improved from 2.8 m to 3.2 m (with an increase of 14.3%), and the monthly average comprehensive footage is jumped from 135 m to 230 m (with an increase of 70.4%); The unit explosive consumption amount is decreased to 1.85 kg/m3, and the large block rate (>0.5 m3) is decreased from over 20% to below 8%; The half hole mark rate of the surrounding holes remains stable at over 85%, and the average over excavation amount is precisely controlled from 250 mm to within 80 mm. This result effectively breaks through the bottleneck of high stress hard rock roadway excavation, and provides engineering demonstration and technical reference for rapid excavation of coal mines under similar working conditions.

     

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