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针对冲击倾向性围岩条件下沿空掘巷的防冲及稳定性控制问题,从应力控制和支护系统设计两方面入手,在分析巷道诱冲因素和变形特征的基础上,提出了冲击倾向性围岩沿空掘巷的防冲控制原理。即合理设计窄煤柱宽度有效降低围岩应力,人为制造软弱夹层释放围岩应力、吸收冲击能,高性能锚杆支护技术体系强化围岩支护小结构强度。现场实践表明,综合采用上述3方面技术措施后,可实现对冲击倾向性围岩条件下沿空掘巷的有效控制,工作面准备及回采期间没有冲击矿压发生,巷道变形满足安全生产要求。
Aiming at the anti-scouring and stability control of gob-side entry driving in impacting surrounding rock conditions, from the aspects of stress control and support system design, based on the analysis of the alluviation factors and deformation characteristics of roadway, the impact tendency Anti - scour control principle of gob - side entry driving along gob - side entry. That is to say, the width of narrow coal pillars should be designed reasonably to reduce the surrounding rock stress, artificial weak interlayer to release the surrounding rock stress and absorb the impact energy, and the high-performance bolt supporting technology system can strengthen the small structural strength of surrounding rock. The field practice shows that the comprehensive use of the above three technical measures can effectively control the gob-side entry under impacting surrounding rock conditions, and no rock burst occurs during the preparation of the working face and during the mining. The deformation of the roadway meets the safety requirements.