梯形金属支架支护失效的关键部位分析  

Key Position of Failure of Trapezoidal Metal Support

作　　者：张宏学 姚卫粉[2] ZHANG Hongxuel;YAO Weifen(College of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China;Dean＇s Office,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南232001 [2]安徽理工大学教务处,安徽淮南232001

出　　处：《煤矿安全》2018年第7期185-188,共4页Safety in Coal Mines

基　　金：安徽省教育厅科研基金资助项目(KJ2016A207)

摘　　要：为了分析梯形金属支架变形的关键部位,基于普氏地压理论和力法原理,建立了梯形金属支架的力学模型,推导了梯形支架变形关键部位的解析解,分析了不同型号矿工钢支架变形关键部位的强度,讨论了棚柱倾角和岩石内摩擦角对关键部位的影响。计算结果表明,梯形支架在对称载荷作用下,不同型号矿工钢梯形支架棚梁变形的关键部位均在棚梁跨中截面,与载荷大小、冒落拱底宽以及岩石内摩擦角等因素无关;而棚柱变形的关键部位与巷道断面尺寸、冒落拱底宽、棚柱倾角、岩石内摩擦角等因素有关,棚柱关键部位距巷道底板0.55~0.63 m之间;随着棚柱倾角的增大,棚柱变形的关键部位距离巷道底板越远;随着内摩擦角的增大,棚柱变形的关键部位越靠近巷道底板。In order to analyze key position of deformation of trapezoidal metal support, the mechanical models of trapezoidal metal support are established based on universal pressure theory and principle of force law. And then, the analytical solutions of key position of deformation of trapezoidal metal support are deduced. Furthermore, the strength of key position of deformation of different types of mine steel brackets is analyzed. The effects of the inclination of shed column and the internal friction angle of rock on the key position are discussed. It is studied that the key part deformation of different types of mine trapezoidal steel beams are all at mid-span cross-section of canopy beams, and there are not relevant to the loads, bottom width of caving arch and the internal friction angle of rock. The key position of shed column relates to the size of roadway section, bottom width of caving arch, the dip angle of shed column and the internal friction angle of rock, and it lies between 0.55 m to 0.63 m from roadway floor. With the increase of the angle of the shed column, the key part of the column deformation is farther away from the roadway floor, and with the increase of internal friction angle, the key part of the deformation of the shed column is closer to the bottom of the roadway.

关 键 词：梯形刚性支架 变形关键部位 内摩擦角 冒落拱 力法原理 

分 类 号：TD353[矿业工程—矿井建设]