摘要
针对园子沟煤矿副井马头门保护层开裂,围岩变形量大等现象,采用模拟分析和现场实测相结合的方法分析了马头门变形破坏的原因。结果表明,节理化泥质软弱围岩、硐室群产生的叠加应力、裂隙水引发围岩膨胀的附加应力和施工扰动在马头门变形破坏中起到了主控作用。在分析其受力机理的基础上提出大断面围岩强化控制技术,即采用环形锚索一体化、深浅孔组合注浆、底脚棚腿锁固及锁口对拉锚索有机结合的总体修复方案对围岩进行二次强化支护。矿压观测结果表明:修复方案实施后,马头门围岩整体移近量较小,巷道围岩变形得到有效控制,达到了巷道断面尺寸的要求。
For the phenomenon of protective layer cracking and surrounding rock large deformation of auxiliary vertical shaft ingate in Yuanzigou Coal Mine, simulation analysis and field measurement method are used to analyze the reasons of deformation and failure of ingate. The results show that jointed muddy soft surrounding rock, superimposed stress caused by chamber group, additional stress from surrounding rock expansion which caused by fissure water and construction disturbance are the main causes of the deformation and failure of the auxiliary vertical shaft ingate. Based on the analysis of the stressed mechanism, we proposed the large section surround- ing rock control technology. The overall repair scheme uses the organic combination of cable circular integration support, grouting combining with deep and shallow holes, locking shed leg at bottom and the counter-pulled anchor to strengthen the support of sur- rounding rock. Mine pressure observation results show that surrounding rock deformation is under effective control and the roadway size reaches the requirements.
出处
《煤矿安全》
北大核心
2017年第6期83-86,共4页
Safety in Coal Mines
关键词
复合软岩
马头门
大断面
修复技术
对拉锚索
围岩控制
layered compound soft rock
ingate
large section
repair technology
counter-pulled anchor cable
surrounding rock control
