锚固位置对深部巷道围岩变形控制影响

On Influence of Anchorage Position on Deformation Control of Deep Roadway Surrounding Rock

以戛达煤矿1700运输巷为研究对象,基于FLAC 3D数值模拟软件,结合理论分析,研究不同锚固方式对巷道稳定性的影响,并针对性地提出控制巷道围岩变形的合理方案.研究结果表明:(1)巷道围岩的变形量与塑性区的大小呈正相关性,即巷道围岩的塑性区范围越大,巷道的形变量越大;(2)锚杆锚固端位于弹性区内比位于塑性区内更能有效控制巷道围岩塑性区的发展,也更能有效控制巷道的变形;(3)在大变形巷道中,巷道围岩的塑性区往往很大,锚杆长度难以满足要求,采用以“中空注浆锚索+锚杆”为主体,以“金属网+锚喷”为辅助的综合控制技术方案能有效控制巷道围岩的大变形.

This paper takes the 1700 transport lane of Jiada Coal Mine as the research object,based on FLAC 3D numerical simulation software and theoretical analysis,and studies the influence of different support methods on the stability of the roadway.It proposes a reasonable plan to control the deformation of the roadway surrounding rock.Results show that first the deformation of roadway surrounding rock is positively correlated with the size ofic zone,that is,the larger the plastic zone of roadway surrounding rock is,the larger the shape variable of roadway.Second,the anchorage end located in the elastic zone can more effectively control the development of the plastic zone of the roadway surrounding rock than in the plastic zone,and can also more effectively control the deformation of the roadway.Third,in the large deformation roadway,the plastic zone of the surrounding rock is often large,and the length of the anchor rod is difficult to meet the requirements if only the anchor rod is used.The comprehensive control technology scheme with“hollow grouting cable+anchor”as the main body and“metal mesh+anchoring and spraying”as the auxiliary can effectively control the large deformation of the surrounding rock of the roadway.