考虑围岩离层影响的端部锚固锚杆荷载分析及其支护设计.PDFVIP

第 32 卷 第 5 期 采矿与安全工程学报 Vol.32 No.5 2015 年 09 月 Journal of Mining Safety Engineering Sept. 2015 文章编号：1673-3363-(2015)05-0760-051 考虑围岩离层影响的端部锚固锚杆 荷载分析及其支护设计 谷拴成，丁潇 (西安科技大学建筑与土木工程学院，陕西 西安 710054) 摘要 在煤矿巷道开挖过程中，巷道围岩变形不协调常常会产生顶板离层，围岩离层对锚杆加固 影响程度的分析直接影响支护工程的安全性。基于拉拔荷载作用下锚杆锚固段的受力分布规律， 综合考虑端部锚固锚杆预紧力作用及离层产生的附加荷载，得出含有离层的系统锚杆受力分布形 式。结果表明：离层影响下，锚固体的轴力和界面剪应力均会增大，离层值过大时锚杆很容易失 效，产生安全隐患。最后将离层影响考虑到煤矿锚固设计中，提出了新的巷道支护设计思路，通 过分析发现考虑离层后的承载力设计方法更安全合理。 关键词 顶板离层；端部锚固；预紧力；锚杆荷载；支护设计 中图分类号 TD 353 文献标志码 A DOI 10.13545/ki.jmse.2015.05.010 The analysis of end anchoring-grouting prestressed anchor loading and support design with bed separation considered GU Shuancheng，DING Xiao (School of Architecture and Civil Engineering，Xi’an University of Science and Technology ，Xi’an ，Shaanxi 710054，China) Abstract Roof bed separation often occurs due to the deformation incoordination of surrounding rock in the process of the excavation of mine roadway. Bed separation has effect on the bolts, and the estima- tion of the influence will directly affect the safety of support systems. The stress distributions of sys- tematic bolt has been obtained, considering the pre-tightening force of end anchoring-grouting bolt and the additional stress caused by roof bed separation. The results have shown that under the influence of roof bed separation, anchorage axial force and shear stress will all increase ．Anchor failure happens easily when bed separation value is too large, which will produce the potential safety hazard. Finally, the effects of bed separation have been taken into consideration in the bolting design, and a new b