动压巷道围岩变形特征及控制技术研究
2020-08-25王冬
王冬



摘 要:煤炭回采带来的动压会给巷道围岩稳定性带来不利影响。以62105采面进风巷为研究对象,采用现场实测方法对动压影响下的巷道围岩变形规律进行分析,并根据围岩变形监测结果提出采用锚网索+注浆方式对动压巷道围岩进行控制。现场应用表明,巷道围岩最大变形量为95 mm,有效降低了动压对巷道围岩变形的影响,取得了显著的围岩控制效果。
关键词:动压巷道;围岩控制;围岩变形;注浆加固
中图分类号:TD353;TD322文献标识码:A 文章编号:1003-5168(2020)19-0070-03
Abstract: The dynamic pressure brought by coal mining will adversely affect the stability of roadway surrounding rock. Taking 62105 mining face inlet airway as the research object, the field measurement method was used to analyze the deformation law of roadway surrounding rock under the influence of dynamic pressure. According to the monitoring results of surrounding rock deformation, it was proposed to use anchor net and grouting to control the surrounding rock of dynamic pressure roadway. Field application shows that the maximum deformation of the surrounding rock of the roadway is 95 mm, which effectively reduces the influence of dynamic pressure on the deformation of the surrounding rock of the roadway and achieves a significant effect of controlling the surrounding rock.
Keywords: dynamic pressure roadway;surrounding rock control;surrounding rock deformation;grouting reinforcement
眾多学者对动压影响巷道围岩变形规律及控制技术展开研究,但是研究成果显然不能满足动压影响巷道围岩控制需要[1-3]。受动压影响,巷道围岩变形显著、控制困难,且变形规律较为复杂[4-6]。对动压影响巷道围岩变形规律进行研究,从而针对性提出围岩控制措施,对控制动压影响巷道围岩变形具有重要的现实意义。
1 工程概况
某矿开采的6号煤层埋深平均650 m,上覆4号煤层已回采完毕。62105回采工作面位于21采区,东侧为正在回采的62103回采工作面,西侧为划定的62107采面。6号煤层平均厚6.12 m,赋存稳定,顶板岩性主要为中砂岩及粉砂岩,底板主要为细砂岩。采面回采巷道受到回采动压影响,围岩变形严重,因此,需要布置合理的动压巷道围岩支护措施,确保巷道使用安全。
2 动压巷道围岩变形分析
2.1 测站布置
在62105采面进风巷掘进至175 m和325 m位置处布置测站,对应1号、2号测站,测量采面每回采20~30 m期间围岩变形量,对巷道在临近采面动压影响下的巷道围岩变形情况进行监测。……
