A study on energy dissipation mechanism of a guided flexible protection system under rockfall impact

被引：0
|
作者：
Jin Y. [1 ,3 ]
Yu Z. [1 ,2 ,3 ]
Luo L. [1 ,3 ]
Zhang L. [1 ,3 ]
Xu H. [1 ,3 ]
Qi X. [1 ,3 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] National Engineering Laboratory for prevention and control of geological disasters in land transportation, Chengdu
[3] Research Center of Protection Structures Against Natural Hazards, Southwest Jiaotong University, Chengdu
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 20期
关键词：
Energy dissipation mechanism; Guided flexible protection system; Index of protection performance; Motion analysis; Rockfall;
D O I：
10.13465/j.cnki.jvs.2021.20.022
中图分类号：
学科分类号：
摘要：
A guided flexible protection system is an efficient flexible protection system. Based on the in-situ full-scale test, the energy dissipation mechanism of the system against rockfall impact was revealed. According to the mechanical, deformation, and energy dissipation characteristics of the components, the system composition was studied, and the energy dissipation mechanism model of system was established. Based on the assumption that the energy recovery coefficient of collision is constant, the calculation method of residual kinetic energy of rockfall under protection was proposed. The in-situ impact test was carried out to study the rockfall movement characteristics with and without protection. Based on the rockfall energy characteristics, the rockfall energy attenuation rate and system influence factor were defined. The results show that under the intervention of the system, the number of collisions between rock and mountain increases by more than 2 times on average, the maximum bounce height of rockfall decreases by 82%. The energy attenuation rate of rockfall increases from 69.7% to 89.2%, the residual kinetic energy of rockfall decreases by 65%, and the system influence factor of energy attenuation is 0.35. The system can effectively suppress and guide rockfall movement, increasing energy dissipation. The calculation method of residual kinetic energy of rockfall proposed in this paper can be used to estimate the residual kinetic energy of rockfall under the protection condition. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
引用
收藏
页码：177 / 185and192
相关论文
共 19 条
  • [11] LIU Chun, YU Zhixiang, LUO Liru, Et al., Dynamic behavior of a concrete dam impacted by debris flows with rock, Journal of Vibration and Shock, 38, 14, pp. 161-168, (2019)
  • [12] LIU Chun, YU Zhixiang, GUO Liping, Et al., Numerical simulation for rockfall impacting an arch RC hangar tunnel based on sph-fem coupled method, Journal of Vibration and Shock, 38, 13, pp. 118-125, (2019)
  • [13] ETAG E., Guideline for European Technical approval of falling rock protection kits, (2012)
  • [14] GRASSL H, VOLKWEIN A, ANDERHEGGEN E, Et al., Steel-net rockfall protection experimental and numerical simulation, Structures Under Shock & Impact Vii, 63, (2002)
  • [15] QI Xin, XU Hu, YU Zhixiang, Et al., Dynamic mechanical property study of break rings in flexible protective system, Engineering Mechanics, 35, 9, pp. 198-206, (2018)
  • [16] (2012)
  • [17] THOENI K, GIACOMINI A, LAMBERT C, Et al., A 3D discrete element modelling approach for rockfall analysis with drapery systems, International Journal of Rock Mechanics and Mining Sciences, 68, pp. 107-110, (2014)
  • [18] MEI Xuefeng, HU Xiewen, LUO Gang, Et al., A study on the coefficient of restitution and peak impact of rockfall based on the elastic-plastic theory, Journal of vibration and Shock, 38, 8, pp. 19-25, (2019)
  • [19] XU X, CRISTINA G, YU Z X, Et al., An energy allocation based design approach for flexible rockfall protection barriers, Engineering Structures, 173, pp. 831-852, (2018)
12