摘要
为了解决冲击地压煤层卸压钻孔一次成孔孔径小、卸压半径小、防冲效果差等问题,在煤层大直径钻孔卸压作用机制研究基础上,开发了针对冲击地压煤层的一次成孔300 mm大直径钻孔技术装备,开展了300 mm大直径钻孔技术防冲效能工程试验研究。结果表明:研制的ZDY20000LK钻机具有施工一次成孔300 mm大直径钻孔的能力,利用视频监控系统可进行远程操作,大幅提高了钻机施工自动化水平和作业人员安全;从孔径角度来看,300 mm卸压钻孔弱化煤岩体的效果比150 mm卸压钻孔弱化煤岩体的效果提高18.5%;从孔间距角度来看,0.6 m的孔间距弱化煤岩体的效果比1.0 m的孔间距弱化煤岩体的效果提高7%,可见提高孔径可更大程度地提高钻孔卸压的能力;从时间角度来看,施工300 mm大直径钻孔卸压1周后,巷帮围岩支护区外的中等冲击危险性区域基本消失,弱冲击危险性区域所占面积下降89.7%;在支护区内2个弱冲击危险性区域面积分别下降85.8%,91.2%。实践表明一次成孔300 mm煤层大直径钻孔可显著提升防冲效果。
Destressing with drilling boreholes has been widely used for coal burst prevention.The effect of small diameter boreholes may not be significant.In this study,an equipment for drilling 300 mm diameter boreholes has been developed and used for destressing.The results show that the ZDY20000LK drilling rig has the ability to drill 300 mm large diameter holes at one time,and can be operated remotely by using the video monitoring system,which greatly improves the construction automation level of the drilling rig and the safety of operators.The effect of weakening coal and rock mass by 300 mm boreholes is 18.5%higher than that by 150 mm boreholes.The effect of weakening coal and rock mass with 0.6 m hole spacing is 7%higher than that with 1 m hole spacing.It can be seen that increasing the hole diameter can improve the distressing effort to a greater extent.After a week of pressure relief by 300 mm boreholes,the medium burst risk area outside the roadway surrounding rock support area basically disappearred,and the area of weak burst risk area decreased by 89.7%.In the support area,the decline percentages of burst risk areas were 85.8%and 91.2%,respectively.The field test shows that the prevention effect of drilling large-diameter borehole within the coal seam has been significantly improved.
作者
潘俊锋
闫耀东
马宏源
邬迪
刘少虹
PAN Junfeng;YAN Yaodong;MA Hongyuan;WU Di;LIU Shaohong(CCTEG Coal Mining Research Institute,Beijing 100013,China;Xi′an Research Institute,China Coal Technology and Engineering Group,Xi′an 710077,China;Coal Mining and Designing Department,Tiandi Science&Technology Co.,Ltd.,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,China Coal Research Institute,Beijing 100013,China)
出处
《采矿与岩层控制工程学报》
北大核心
2022年第5期1-11,共11页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金面上资助项目(52174186)
国家重点研发计划资助项目(2017YFC0804204)。
关键词
冲击地压
一次成孔
大直径
遥控钻机
防冲效能
rock burst
primary drilling
large diameter
remote control drilling rig
effectiveness of preventing rockburst
作者简介
潘俊锋(1979-),男,陕西旬邑人,研究员,博士生导师,主要从事冲击地压治理方面的研究工作。E-mail:panjunfeng@yeah.net;通信作者:闫耀东(1997-),男,河南信阳人,硕士研究生,主要从事冲击地压防治方面的研究工作。E-mail:717540692@qq.com。
