基于3DEC的深埋软岩煤巷U型钢支架-锚网索耦合支护

U-shape Steel Frame and Bolt-mesh-anchor Coupling Support Technology in Deep Soft Rock Coal Roadway by 3DEC

以某矿三采区运输下山为工程背景,基于原锚网索支护巷道变形破坏特点和原因,提出了深埋软岩煤巷U型钢支架-锚网索耦合支护技术,并利用3DEC数值模拟分析其围岩应力、位移、塑性区等特征。结果表明:相比于原支护,巷道两帮及顶板浅部围岩应力明显增加,变形量、塑性区深度降低显著,顶底板移近量108.56 mm、两帮变形量61.39 mm、最大塑性区深度3 m,支护效果显著;现场巷道顶底板和两帮变形量为115.95 mm和67.00 mm,顶板离层基本为0,验证了支护技术的可靠性。

Based on the project background of transport downhill in 3~# mining area of a coal mine, the U-shape steel frame and bolt-mesh-anchor coupling support technology in deep soft rock coal roadway is proposed according to the roadway deformation and failure characteristics and causes of the original bolt-mesh-anchor support method, meanwhile, the mechanical response characteristics including stress, displacement and plastic zone of roadway surrounding rock and the support effect are analyzed by 3DEC numerical simulation. The results show that the shallow surrounding rock stress of two sides and roof increases obviously,and the deformation and plastic zone depth decrease remarkably compared with the original support; the roof-to-floor convergence,deformation of two sides and maximum plastic zone depth are respectively 108.56 mm, 61.39 mm and 3 m, and the overall support effect of roadway surrounding rock is great. The field monitoring deformation of roof and floor, two sides, and roof separation are respectively about 115.95 mm, 67.00 mm and 0, which verifies the reliability of support technology.