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为开发新型轴向劈裂式锚杆吸能构件,试验研究内径为26 mm,壁厚分别为3和4 mm的金属圆管试件劈裂变形及吸能安全特性,采用能量法分析其吸能原理。结果表明,试件劈裂吸能过程分为峰值载荷阶段和恒定载荷阶段,其中,恒定载荷阶段恒定载荷为59.34116.60 k N,其作用下的吸能量为4.9211.47 k J;试件劈裂过程中变形稳定,形成“螺旋”板条,试件主要通过扩径塑性变形、管壁撕裂、板条摩擦耗散能量;试件恒定载荷值及相应吸能量试验结果与理论结果相符。
In order to develop a new type of energy-dissipating component of axial split-type rock bolt, the fracture and deformation and energy-absorbing safety characteristics of a metal pipe specimen with internal diameter of 26 mm and wall thickness of 3 and 4 mm were studied. Can principle. The results show that the specimen splitting energy absorption process is divided into the peak load stage and the constant load stage, in which the constant load of the constant load stage is 59.34116.60 kN and the energy absorbed by it is 4.9211.47 kJ; During the process of cracking, the deformation is stable and the “spiral” slab is formed. The specimen mainly dissipates the energy through the plastic deformation of expanded diameter, the tear of the pipe wall and the friction of the slat. The test results and the theoretical results of the constant load value and the corresponding energy absorption of the specimen Match.