动压巷道棚索协调支护技术应用实践

针对普通U型钢支护存在支架强度低、支护围岩相互作用关系差以及不能适应动压巷道复杂应力环境和大变形的现状,提出了以高阻可缩重型U型钢和高强度锚索为主的棚索协调支护技术,具体包括壁后充填注浆改善支护围岩相互关系,薄弱区锚索补强提高支护结构整体稳定性以及锚注加固底板控制底鼓。结合某矿巷道具体地质条件,通过数值模拟研究了不同支护方案对动压巷道围岩变形的控制效果。观测结果表明：顶底板移近量约280 mm,两帮移近量约为260 mm,采用棚索协调支护技术能有效控制巷道围岩变形。

Applied Practices on Frame Timber and Anchor Coordinated Support Technology to Mine Dynamic Pressurized Gateway

According to the present status of the low support strength,poor mutual action relationship of the support surrounding rock and not suitable to the complicated stress environment and high deformation of the mining dynamic gateway for the conventional U type steel support,a frame support and anchor coordinated support mainly with the high resistance and yield heavy U type steel support and the high strength anchor was provided,including the backwall backfilling and grouting to improve the mutual relationship between the support and the surrounding rock,the reinforcement of the anchor in the thin and weak zone applied to improve the completed stability of the support structure and the bolt and grouting reinforcement applied to control the floor heave.In combination with the certain geological conditions of the mine gateway in a mine,a numerical simulation was applied to study the control effect of the surrounding rock deformation in the dynamic mining gateway with different support plans.The observation results showed that the convergence between the roof and floor was about 280 mm and the convergence between the two sidewalls was about 260 mm.The application of the frame support and anchor coordinate support technology could effectively control the surrounding rock deformation of the mine gateway.