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王庄矿大断面沿空掘巷围岩变形控制及快速成巷技术研究
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摘要
大采高工作面的大断面巷道快速掘进是煤矿安全高效生产的一个重要保障。本文基于岩石基本力学性质测试、地应力测试、数值模拟分析及现场调研监测,研究了大采高工作面大断面巷道顶板的变形破坏机理,提出了巷道基本顶三角块结构并建立了相应的失稳判定法则,为沿空掘巷的窄煤柱合理宽度设计提供了依据;分析了大采高动压巷道的围岩破碎机理,揭示了综放沿空掘巷在回采期间的大变形属结构效应,提出了采用高水速凝材料注浆和高强度预应力锚杆联合支护技术来控制巷道围岩的变形,现场应用效果良好。综合利用灰色理论优化快速掘进方案和利用神经元系统算法系统优化了快速掘进工序,最大限度地实现了多工序平行作业,使工作面掘进工序达到最佳匹配。对EBJ-120掘进机进行了前配套改造,研制了一种新型可伸缩式立体掘锚一体机,在锚杆钻机和掘进机空间布置上,采用二级液压伸缩装置使其互不干扰又能相互配合工作,完成并行作业;多自由度立体锚钻系统有两个锚杆钻机,能进行前后移动、水平横移、上下升降、旋转倾斜,可多方位、多角度的进行巷道顶板和侧帮锚钻作业。实现了综合机械化掘锚一体,提高了支护速度,提高了掘进设备的能力和有效度,为实现快速掘进目标提供了有力保障。
Rapid excavation of large mining height face is an important guarantee for the efficient and safe coal mining. Based on the rock mechanical properties testing, stress test, numerical simulation analysis and research monitoring at workplace, we research mining height face Roof deformation and failure mechanism, proposing roadway basic roof triangular block structure and the determination of instability large mining law, providing a criterion for the narrow coal pillar of the roadway driving along the goaf,having analysis of high dynamic pressure roadway surrounding rock crushing mechanism, revealing the large deformation of gob-side in integrated mining in the recovery period is a structural effect, the combined support of the high-water rapid hardening materials grouting and high-strength pre-stressed anchor to control the deformation of the surrounding rock, and getting the good responds. Both gray theory and neutron system algorithm have been applied to optimize rapid excavation plan and rapid excavation process, respectively, to maximize the parallel operation of multiple processes, so that the face tunnelling processes to achieve the best match. Since former supporting the transformation of EBJ-120development machine we developed a new scalable three-dimensional excavation and bolt machine, on the spatial arrangement of the bolt rig and development machine, using two telescopic devices to interfere with each other but also complement each other to complete the parallel job, degrees of freedom of three-dimensional anchor drill two bolt rig can move back and forth, traverse the level, move up and down, rotate, tilt, can be multi-faceted, multi-angle of the tunnel roof and the side to help anchor drilling operations. Realize the comprehensive mechanization of excavation and bolt combine as one, the supporting rate and improve the ability and validity of the tunneling equipment, provided a strong guarantee for the realization of the goal of rapid excavation.
引文
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