煤矿巷道护表金属网与钢带组合力学性能试验研究

    Experimental study on mechanical properties of the combination of surface protection metal mesh and steel strip for coal mine roadways

    • 摘要: 合理的巷道护表构件可对巷道围岩变形进行有效控制,其控制效果一定程度上取决于巷道护表构件的力学性能。为了掌握煤矿巷道护表构件的力学性能,利用矿用金属网力学试验机开展了静载条件下护表金属网与钢带组合的力学性能试验研究。将钢筋焊接网、热镀锌搭接网、金属菱形编织网3类金属网分别与T型、W型2种钢带组合成的6种巷道护表构件安装于矿用金属网力学试验机,通过试验机的电动液压千斤顶对巷道护表构件持续加载,直至载荷突然降低时停止;利用位移与载荷传感器采集的电动液压千斤顶的油缸位移与载荷得到巷道护表构件的载荷−位移曲线,同时利用相机记录巷道护表构件的变形破坏情况,进而分析金属网与钢带组合系统的承载特性及相关参数对其承载强度与变形的影响规律。研究表明:①静载加载条件下,配合T型与W型钢带约束后,金属网变形破坏过程可划为弹性变形阶段、塑性变形阶段、渐进破坏阶段,其中配合T型与W型钢带约束后钢筋焊接网承载性能波动剧烈;②在6种巷道护表构件组合中,W型钢带+金属菱形编织网组合承载力最大(109.1 kN),T型钢带+热镀锌搭接网组合承载力最小(63.2 kN);③配合W型钢带约束时,钢筋焊接网刚度最大(0.2 kN/mm),金属菱形编织网刚度为0.16 kN/mm,热镀锌搭接网刚度最小(0.14 kN/mm);与T型钢带配合后,金属菱形编制网、钢筋焊接网、热镀锌搭接网3类金属网刚度增幅依次为37.5%、20%、7.14%,有利于抑制“网兜”形成。

       

      Abstract: Reasonable roadway surface protection components can effectively control the deformation of roadway surrounding rock, and their control effect depends to a certain extent on the mechanical properties of the roadway surface protection components. To grasp the mechanical properties of surface protection components for coal mine roadways, a study on the mechanical performance tests of the combination of surface protection metal mesh and steel strip under static load conditions was carried out using a mining metal mesh mechanical testing machine. Six types of roadway surface protection components, composed of three types of metal meshes (steel bar welded mesh, hot-dip galvanized lapped mesh, and metal diamond woven mesh) combined with two types of steel strips (T-type and W-type) respectively, were installed on the mining metal mesh mechanical testing machine. The electric hydraulic jack of the testing machine continuously loaded the roadway surface protection components until the load suddenly decreased; the load-displacement curves of the roadway surface protection components were obtained using the cylinder displacement and load collected by displacement and load sensors, and the deformation and failure of the roadway surface protection components were recorded by a camera. Furthermore, the bearing characteristics of the metal mesh and steel strip combination system and the influence laws of related parameters on its bearing strength and deformation were analyzed. The results show that: ①under static loading conditions, with the constraint of T-type and W-type steel strips, the deformation and failure process of the metal mesh can be divided into the elastic deformation stage, plastic deformation stage, and progressive failure stage, among them, the bearing performance of the steel bar welded mesh fluctuates sharply when it is combined with the constraint of T-type and W-type steel strips; ②among the six combinations of roadway surface protection components, the combination of W-type steel strip + metal diamond woven mesh has the maximum bearing capacity (109.1 kN), and the combination of T-type steel strip + hot-dip galvanized lapped mesh has the minimum bearing capacity (63.2 kN); ③when combined with W-type steel strip constraint, the steel bar welded mesh has the maximum stiffness (0.2 kN/mm), the stiffness of metal diamond woven mesh is 0.16 kN/mm, and the hot-dip galvanized lapped mesh has the minimum stiffness (0.14 kN/mm). When combined with T-type steel strip, the stiffness increases of the metal diamond woven mesh, steel bar welded mesh, and hot-dip galvanized lapped mesh are 37.5%, 20%, and 7.14% respectively, which is conducive to inhibiting the formation of "mesh pockets".

       

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