深部高地应力软岩巷道围岩分区破裂模拟及支护设计

摘要

基于深部巷道分层破坏现象机理的分析,开展了深部巷道物理模拟破坏试验.结果表明:巷道的破坏自巷道底板开始,向侧墙和拱顶部位依次发展,在拱脚部位不但产生裂缝,而且会产生向巷道内的明显位移;左侧墙最远裂缝距巷帮距离为80 mm,割裂体宽度范围为3～20 mm;右侧墙最远裂缝距巷帮62 mm,割裂体宽度为3～17 mm;底板最远裂缝距巷帮距离为120 mm,割裂体宽度为10～33 mm;拱顶最远处裂缝距巷帮距离为60 mm,割裂体宽度为5～35 mm.针对巷道围岩变形特征,采用高预应力锚杆锚索注浆分次支护,巷道围岩变形得到了有效控制.%Based on the phenomenon analysis of deep roadway layering fracture,the physical simulation test of deep roadway was carried out.Test results show that the roadway failure starts from floor,and then the failure develops to side walls and roof.Cracks develop at the arch of the foot,and obvious displacement appears at the arch of the foot;the distance of the farthest crack in left wall from the roadway's side is 80 mm,the range of fragmented body width is 3 mm to 20 mn;the distance of the farthest crack in right wall from the roadway's side is 62 mm,the range of fragmented body width is 3 mm to 17 mm;the distance of the farthest crack in floor from the roadway's side is 120 mm,the range of fragmented body width is 10 to 33 mm;the distance of roof farthest crack from the roadway's side is 60 mm,the range of fragmented body width is 5 to 35 mm.The roadway is graded supported by the technology of high pre-stressed bolt and anchor grouting according to the deformation characteristics of roadway.Engineering application shows that the deformation of surrounding rock has been effectively controlled.