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.
With the depletion of shallow resources,coal mining gradually turns to deep mining.Considering the complicated mechanical environment,rock mechanical behavior and engineering response,efficient methods of surrounding rock control in deep roadway was put forward.By analyzing factors affecting the surrounding rock stability and their influence rules,it is believed that improving stress state and mechanical property of surrounding rock,choosing reliable support scheme,improving support resistance and optimizing roadway cross-sections are efficient ways to control surrounding rocks in deep roadway.According to field application,basic framework of the control technology in deep roadway was generated.The results show that deep roadway should avoid high stress influence in space and time;surrounding rock deformation can be controlled within 20 mm by stress relief of floor roadway;the stress environment of deep roadway can be improved by upward mining;the advance rate of working face increases from 48 mto 90mper month;roof and floor convergence decreases by 900 mm through drilling ahead of roadway heading.By using bolts of high-strength,high pre-stressing force and high elongation,together with reliable grouting reinforcement parameters,the mechanical property of surrounding rock can be effectively improved,and the surrounding rock deformation is lowered by more than 40%.Moreover,measures such as arc cross-section and wall back filling should be taken to achieve even support and enhance the support resistance.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2017年第3期467-473,共7页
Journal of China University of Mining & Technology
关键词
深部巷道
影响因素
应力转移
注浆加固
锚杆支护
支护阻力
deep roadway
influence factors
stress transfer
grouting reinforcement
bolting
support resistance
