Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology Mukong Coal Mine,Guizhou Yuneng Mining Limited Liability Company

针对复杂条件下软弱煤岩巷道常出现的大变形、支护结构破坏严重等支护控制难题,以贵州木孔煤矿1301综采工作面运输巷为研究对象,通过现场工程调研、室内试验,总结得出了巷道变形失稳机理,针对性地提出了"全锚索(长、短锚索)+金属网+钢带"联合支护优化方案,并运用FLAC3D软件对比分析了其与原方案的支护效果。结果表明:优化方案有效地控制了巷道围岩的各部位变形,且围岩应力较大程度地被释放,形成了较为协调的整体系统。通过现场监测可知:巷道两帮最终累计移近量为327mm,顶底板移近量为239 mm,后期变形移近量较小且趋于稳定状态,而锚索受力在前20 d增加得很快,之后出现下降现象,但最终锚固力趋于一较高的稳定值,进而有效地控制了巷道的大变形破坏问题。

in view of the support control problems,such as large deformation and severe support structure damage of fragile coal-roek roadwayunder complex geological conditions,this paper took No.1301 haulage roadway as the research object and on-site engineering research and laboratory test as the methods,concluded the deformation and failure mechanism of coal-rock roadway.put forward to an integrated and optimized supporting scheme-whole anchor cable(ong and short anchor cable) +metal net + steel belt and analyzed the supporting effects of original schemeand optimized scheme contrastively by FLAC3 Dsoftware. The results showed that,the optimized scheme effectively controlled the deformation ofsurrounding rock of the roadway and released the surrounding rock stress to a greater degree,which formed a relativly integrated system.Accoding to the site monitoring,final convergence of two roadway sides was 327 mm and roof and foor 239 mm,and later convergence got smaller and stable; anchor cable press increased quickly in frst 20 days and then decreased ,but the anchor force reached to a high stable value eventallywhich effectively controlled the large deformation of roadway.

国家自然科学基金资助项目(51574122)；湖南省教育厅科学研究重点资助项目(14A045)；湖南科技大学研究生创新基金资助项目(S140001)；