大断面切眼支护解除对围巷稳定性影响分析  

Analysis on Support Released of Large Cross-Section Open-Off Cut Affected to Stability of Surrounding Roadways

作　　者：董健涛[1] 茅献彪[2] 

机构地区：[1]长安大学理学院,陕西西安710064 [2]中国矿业大学理学院,江苏徐州221008

出　　处：《煤炭工程》2012年第11期17-19,共3页Coal Engineering

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400);中央高校基本科研业务费专项资金(CHD2009JC109)

摘　　要：大断面切眼锚网支护在综放工作面开切眼的应用效果良好,但由于锚杆锚索的悬吊作用造成老顶不能及时垮落,对邻近巷道稳定造成了一定的影响。文章针对这个问题运用理论分析和数值模拟的方法并结合现场观测,研究了综放开切眼锚网索联合支护解除对围岩支承压力和巷道变形的影响。结果表明:切眼锚网支护解除能使切眼顶板随工作面推进而垮落,缩短采场老顶初垮步距,使得分配到排水巷与切眼间煤柱上的支承压力明显下降,切眼后排水巷围岩变形明显减小,有利于切眼后排水巷围岩稳定。The application effect of the bolt and steel mesh support in large cross section open-off cut to the open-off cut of the fully mechanized top coal caving mining face was excellent.But the suspension role of the bolt and anchor made the main roof not timely falling down and caused certain influences to the stability of the adjacent gateways.The theoretical analysis and the numerical simulation method combined with the site observations were applied to study the releasing of the bolt/steel mesh/anchor combined support in the open-off cut of the fully mechanized top coal caving mining affected to the support pressure of the surrounding rock and the gateway deformation.The results showed that the bolt and steel mesh support released of the open-off cut could make the roof of the open-off cut falling down with the pushing forward of the coal mining face and could reduce the initial falling step distance of the main roof in the coal mining face.Thus the support pressures distributed to the water drainage gateway and the coal pillars between the open-off cut would be obviously reduced.

关 键 词：大断面 切眼 支护解除 围岩稳定性 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]