深部巷道围岩控制的有效途径

发布时间：2018-06-29 22:20

本文选题：深部巷道 + 影响因素　；参考：《中国矿业大学学报》2017年03期

【摘要】：针对煤炭开采逐渐由浅部转向深部,提出在深部复杂的力学环境下,岩体力学行为和工程响应条件下深部巷道围岩控制的有效方法.文中确定了影响巷道围岩稳定性的因素,分析了各影响因素对巷道围岩稳定性的影响规律,认为改善巷道围岩应力状态及围岩力学性能、合理选择巷道支护形式和提高其支护阻力以及优化巷道断面等为深部巷道围岩控制的有效途径.现场应用结果表明:巷道首选在时空上避开高应力作用,底板掘卸压巷可使巷道变形量控制在20mm以内,上行开采改善了深部巷道应力环境,工作面推进速度由48 m/月提高到90m/月左右,巷道迎头超前钻孔卸压后巷道顶底板移近量减小了900mm;采用高强、高预紧力、高延伸率锚杆(索)支护系统配合合理的注浆加固参数,有效提高巷道围岩强度,巷道围岩变形量降低40%以上.另外,尽量选择弧形断面,壁后充填等措施,实现支护体均匀承载,提高支护阻力.
[Abstract]:In view of the coal mining gradually changing from shallow to deep, an effective method for controlling the surrounding rock mass of deep roadway under the condition of rock mass mechanics behavior and engineering response is put forward in this paper. In this paper, the factors influencing the stability of surrounding rock of roadway are determined, and the law of influencing factors on the stability of surrounding rock of roadway is analyzed. It is considered that the stress state and mechanical performance of surrounding rock of roadway can be improved. It is an effective way to control the surrounding rock of deep roadway by reasonably selecting the supporting form of roadway, improving the supporting resistance and optimizing the section of roadway. The field application results show that the roadway should avoid the action of high stress in time and space, the deformation of roadway can be controlled within 20mm and the upward mining can improve the stress environment of deep roadway. The advancing speed of working face is increased from 48 m / month to about 90m/ month, the roof and floor movement of roadway is reduced by 900mm after the head-on drilling and unloading, and the bolting system with high strength, high pretension and high elongation is used in combination with reasonable grouting and reinforcement parameters. The deformation of roadway surrounding rock can be reduced by more than 40% by effectively increasing the strength of roadway surrounding rock. In addition, the arc section and backfill are chosen as far as possible to achieve uniform bearing of the supporting body and increase the support resistance.
【作者单位】：中国矿业大学矿业工程学院;
【分类号】：TD353

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