Full scale test and FEM simulation to ring-type brake energy#br#
dissipater in falling rock protection
LIU Chengqing1，2，CHEN Linya1，CHEN Chi3，DENG Yongxiang1
(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. Key Laboratory of High-speed Railway Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. China Railway Siyuan Survey and Design Group Co.，Ltd.，Wuhan，Hubei 430063，China)
Abstract：The energy dissipater of ring-type brake for falling rock protection was studied to investigate the load-displacement curves and the energy dissipation formula. Firstly，the working mechanism of the energy dissipater of ring-type brake was described. The main factors of influence，such as the pretension，the length of aluminum sleeves，the thickness of the steel pipe and the diameter of steel pipe were obtained. Secondly，the full-scale tests and finite element analysis for verification were carried out and the results were in good agreement with each other. Thirdly，the load-displacement curves and the energy dissipation characteristics under the action of the main influence factors were further studied based on the finite element simulation of the engineering examples. The starting force of the energy dissipater of ring-type brake was found to increase with the increasing of the length of the aluminum sleeves and the decreasing of the diameter of steel pipe. The energy dissipation changed significantly with the length of the aluminum sleeves in a certain range，while the diameter of steel pipe had a little effect on its energy dissipation. The staring force and energy dissipation of the energy dissipater of ring-type brake were increased gradually with the increasing of pretension or thickness of the steel pipe. The proposed tri-linear analysis model reflected well the characteristic of the load-displacement curves with three stages and the presented energy dissipation formula facilitated the design and engineering application of the energy dissipater of ring-type brake. The energy dissipater of ring-type brake enhanced the flexibility of the passive flexible protection and prolong the impacting time，also reduced significantly the energy consumption of the tension anchor rope and the supporting rope.
刘成清1，2，陈林雅1，陈 驰3，邓永祥1. 被动柔性防护网中减压环力学试验及有限元分析[J]. 岩石力学与工程学报, 2016, 35(6): 1245-1254.
LIU Chengqing1，2，CHEN Linya1，CHEN Chi3，DENG Yongxiang1. Full scale test and FEM simulation to ring-type brake energy#br#
dissipater in falling rock protection. , 2016, 35(6): 1245-1254.
2016, Vol. 35 
