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针对冲击危险巷道对锚杆支护结构的特殊要求,基于六角管挤压摩擦吸能特性研发了由内置六角管衬里的吸能套筒、端部设有摩擦圆柱的螺纹钢锚杆、钢绞线锚索与锚杆尾部吸能装置组成的吸能防冲锚杆索.基于吸能套筒几何参数与变形特征分析,推导了套筒内半径、摩擦圆柱半径与六角管壁厚三者之间的相互配合关系.采用塑性弯曲理论结合数值模拟与室内试验方法,进行了六角管挤压变形过程的力学分析.结果表明:给定套筒内半径与六角管壁厚时,当摩擦圆柱半径小于临界半径时,摩擦圆柱对六角管起挤压摩擦作用,其阻力值随着摩擦圆柱的进入逐渐增大,摩擦圆柱全部进入后则为恒定值;当摩擦圆柱半径大于临界半径时,随着摩擦圆柱的进入外部套筒开始对挤压变形后的六角管提供径向压缩作用,阻力会显著增大;摩擦圆柱长度与吸能阻力呈线性关系.给出了平均吸能阻力为140kN时吸能套筒的具体结构参数及其防冲支护算例.
Aimed at the special requirements of rock bolting supporting structure in impacting roadways, a hexagonal pipe-lined energy-absorbing sleeve was developed based on hexagonal pipe extrusion friction energy absorption. Line anchorage cable and the tail-end energy-absorbing device.According to the geometrical parameters and deformation characteristics analysis of the energy-absorbing sleeve, the inner radius of the sleeve, the radius of the friction cylinder and the thickness of the hexagonal pipe The mechanical analysis of hexagon tube extrusion process was carried out by using the theory of plastic bending combined with numerical simulation and laboratory test.The results show that when the radius of the sleeve and the wall thickness of the hexagonal tube are the same, When the radius of the friction cylinder is larger than the critical radius, the contact angle between the friction cylinder and the hexagonal tube increases with the entrance of the friction cylinder, Friction cylinder into the outer sleeve began to squeeze the deformation of the hexagonal tube to provide radial compression, the resistance will be significantly increased; friction cylindrical length and resistance to absorption of a linear relationship is given The specific structural parameters of the energy-absorbing sleeve and the example of its anti-scuffing support when the resistance of the energy-absorbing is 140kN.