动压影响巷道U型钢支架-锚索协同支护机理及其承载规律

针对U型钢支架支护动压影响巷道强烈变形的支护难题，采用数值模拟方法，研究U型钢支架-锚索协同支护作用机理，提出了U型钢支架-锚索协同支护技术；在开展现场工业试验的同时，采用现场实测方法，监测动压影响由开始至结束过程中巷道围岩表面位移量、U型钢支架和结构补偿锚索实际承受载荷情况。研究结果表明：采用U型钢支架-锚索协同支护后明显改善巷道围岩应力分布，增大巷道浅部围岩残余强度，同时通过锚索的锚固作用，优化了U型钢支架承载性能，增大U型钢支架的承载能力和抗变形能力，提高了U型钢支架的整体稳定性，实现U型钢支架整体承载；当围岩变形压力较大时，U型钢支架随着围岩变形，巷道两帮和肩窝是变形压力最大的位置，相应地锚索为U型钢支架上述部位提供较大的抵抗变形力，阻止支架内突变形，同时U型钢支架作为一个整体结构，支架被束缚在有限的变形空间，而其余的大变形通过支架搭接部位缩动释放，实现了U型钢支架高阻可缩的特性。

Research on U-shape steel frame and anchor cable collaborative support mechanism and loading law of roadway under dynamical pressure impact

In order to overcome the support difficulty of roadway severe deformation supported by U-shape steel frame under dynamical pressure impact,a numerical simulation was conducted to study the function mechanism of U-shape steel frame and anchor cable collaborative support,and a U-shape steel frame and anchor cable collaborative support technology was proposed.Meanwhile the field measurement method was used to monitor the surface displacement of roadway surrounding rock and the practical bearing situation of U-shape steel frame and structure compensation anchor cable during the influence process of riding mining pressure.The results show that: the technology of U-shape steel frame and anchor cable collaborative support is obviously useful for improving the surrounding rock stress,increasing the residual strength of roadway shallow surrounding rock,optimizing the bearing characteristic of U-shape steel frame,magnifying the bearing capacity and non-deformability of U-shape steel frame,and improving the overall stability of U-shape steel frame.When surrounding rock deformation pressure is large,the U-shape steel frame will deform with surrounding rock and the biggest deformation pressure presents at the roadway’s sides and humeral pits,where the anchor cable can provide deformation resistance to prevent the interior convex deformation of U-shape steel frame.As an integral structure,the U-shape steel frame is bound to the limited deformation space,and its rest large deformation is released through the slip of frame’s lap joint,then the high resistance and contractibility characteristic of U-shape steel frame is achieved.