In-situ tests and numerical analysis of a diversion guidance system for rockfall protection at tunnel entrance

QI Xin1, DENG Qianqian1, ZHAO Lei1, YUAN Song2, LI Zhenliang1, WANG Xibao2, YU Zhixiang1

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 9-16.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 9-16.

In-situ tests and numerical analysis of a diversion guidance system for rockfall protection at tunnel entrance

  • QI Xin1, DENG Qianqian1, ZHAO Lei1, YUAN Song2, LI Zhenliang1, WANG Xibao2, YU Zhixiang1
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Abstract

Aiming at the urgent need of rockfall protection at the entrance of tunnels in difficult and dangerous mountainous areas, a flexible diversion guiding system is proposed. Here, full-scale impact test were conducted for two sets of diversion guidance system, and the test data was collected by high-speed cameras, data acquisition instruments, etc., and the diversion guidance performance of the system was analyzed. Based on LS-DYNA, the dynamic nonlinear model of the diversion guidance system is established, the full-scale test is inversely analyzed, and the effect of rockfall splitting and the energy consumption characteristics of the system are studied. A parametric analysis of the diversion capacity of the flexible diversion guiding structure was carried out by using rockfall groups impact. The research parameters include the lateral gradient and the longitudinal gradient. The results showed that the flexible diversion guiding structure can be divided into the characteristics of interception stage and diversion stage. the impact force reached the maximum in both stages, The peak impact force in the diversion stage is 64% of the peak impact force in the interception stage; the energy consumption of the brakes accounts for 50% of the total energy consumption of the structure; When the test block of test 2 leaves the system, the lateral offset distance reaches 5.75m, the kinetic energy of the test block is only 15% of the initial impact energy, and the effect of shunt energy dissipation is obvious. Further combined with numerical simulation, the influence of lateral and longitudinal dip angles on the migration ratio under the action of rockfall swarms was investigated. The lateral gradient is between 40 ° and 45 °, and the longitudinal gradient is about 20 °, which can achieve better diversion effect.

Key words

diversion guidance system / field test / numerical analysis / diversion capacity

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QI Xin1, DENG Qianqian1, ZHAO Lei1, YUAN Song2, LI Zhenliang1, WANG Xibao2, YU Zhixiang1. In-situ tests and numerical analysis of a diversion guidance system for rockfall protection at tunnel entrance[J]. Journal of Vibration and Shock, 2023, 42(17): 9-16

References

[1] 搜狐新闻.高养中心迅速清理武罐高速公路路面落石.[EB/OL].[2020-05-09].
https://www.sohu.com/a/393958982_810019.Sohu News. Gaoyang Center quickly cleans up rocks on the road of Wuguan Expressway. [EB/OL]. [2020-05-09].
https://www.sohu.com/a/393958982_810019.
[2] 网易新闻.注意!林州太行隧道出现落石,临时封闭.[ EB /OL]. [2021-07-11].
https://www.163.com/dy/article/GEKRHGEJ0545B07P.html.NetEase News. Attention! Rockfall occurred in Taihang Tunnel in Linzhou, temporarily closed. [EB /OL]. [2021-07-11].
https://www.163.com/dy/article/GEKRHGEJ0545B07P.html.
[3] 庄心善,胡其志,何世秀.锚杆加固岩体边坡设计法分析[J].岩石力学与工程学报,2002,(7):1013-1015.
Zhuang X S,Hu Q Z,He S X. Study on design method of bolts for reinforcement of rockmass slopes [J]. Chinese Journal of Rock Mechanics and Engineering, 2002, (7):1013-1015.
[4] 申玉生,高波,胡邦,等.强震区山岭隧道围岩全环间隔注浆预加固的方案研究[J].土木工程学报,2011,44(S1):186-191+200.
Shen Y S, Gao B, Hu B et.al. Study on the interval grouting pre-reinforcement scheme of mountain tunnel surrounding rock in high-intensity earthquake zone[J]. China Civil Engineering Journal,2011,44(S1):186-191+200.
[5] 杨晓华,肖靖,辛延甫,等.黄土隧道洞口浅埋段塌方冒顶处治及效果分析[J].建筑科学与工程学报.2021,38(5):118-126. Yang X H, Yang X H, Xiao J, Xin Y F. et.al. Treatment and Effect Analysis of Collapse and Roof Fall in Shallow Buried Loess Tunnel Entrance[J]. Journal of Architecture and Civil Engineering.2021,38(5):118-126.
[6] LI J, CHEN S, YU F, JIANG L. Reinforcement mechanism and optimization of reinforcement approach of a high and steep slope using prestressed anchor cables[J]. APPLIED SCIENCES-BASEL, 2020, 10(1), 266.
[7] ZHAN QB, SUN XJ, Li C, et al. Stability analysis and reinforcement of a high-steep rock slope with faults: Numerical analysis and field monitoring ADVANCES IN CIVIL ENGINEERING.2019(2019).
[8] EFFEINDZOUROU A, GIACOMINI A, THOENI K, et al. Numerical investigation of rockfall impacts on muckpiles for underground portals[J]. Rock Mechanics &Rock Engineering. 2017, 50(6):1569-1583.
[9] 孟杰,王玉锁,王明年,等.落石冲击下轻型刚性棚洞结构力学响应[J].现代隧道技术,2019,56(S2):172-178.
Meng J, Wang Y S, Wang M N. et.al. Mechanical Response of Light Rigid Shed Tunnel Structure under Rockfall Impact[J]. Modern Tunnelling Technology, 2019,56(S2):172-178.
[10] 何思明,吴永. 新型耗能减震滚石棚洞作用机制研究[J].岩石力学与工程学报,2010,29(5):926-932.
He S M, Wu Y. Research on cushioning mechanism of new-type energy dissipative rock shed [J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(5):926-932.
[11] WU Y., HE S., LI X. et al. Dynamic response and optimization of an inclined steel rock shed by the graded energy dissipating method[J]. J. Mt. Sci. 2019(16), 138–152
[12] Luo L., Yu Z., Jin Y. et al. Quantitative back analysis of in situ tests on guiding flexible barriers for rockfall protection based on 4D energy dissipation[J]. Landslides 2022(19), 1667–1688 .
[13] 崔廉明,石少卿,王文康.地下工程口部防落石拖挂网的试验和数值分析[J].地下空间与工程学报,2018,14(06):1549-1557.
Cui L M, Shi S Q, W W K. Experimental and Numerical Analysis on the Rockfall Attenuating Net of the Underground Engineering Gateway[J]. Chinese Journal of Underground Space and Engineering,2018,14(06):1549-1557.
[14] 崔廉明,石少卿,汪敏,王文康.多位置分布配重下引导式落石缓冲系统冲击防护性能研究[J].岩石力学与工程学报,2019,38(02):332-342.
Cui L M, Shi SQ, Wang M et al. Research on the impact protection performance of the rockfall attenuator system under multiposition distributed counterweights conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2019,38(02):332-342.
[15] 金云涛,余志祥,骆丽茹,张丽君,许浒,齐欣.引导式柔性网系统防落石冲击耗能机制研究[J].振动与冲击,2021,40(20):177-185+192.
Jin Y T, Yu Z X, Luo L R et al. A study on energy dissipation mechanism of a guided flexible protection system under rockfall impact[J].Journal of Vibration and Shock,2021,40(20):177-185+192.
[16] Wenkang Wang, Shaoqing Shi, Yingfeng Liu et al. The application of expanded polystyrene cushion layer in oblique flexible net systems for rockfall protection: A new attempt[J]. International journal of protective structures, 2018, 9(2):141-156.
[17] Mentani A, Govoni L, Gottardi G, et al. A new approach to evaluate the effectiveness of rockfall barriers[J]. Procedia Engineering, 2016, 158:398-403.
[18] 赵世春,余志祥,韦韬,齐欣. 被动柔性防护网受力机理试验研究与数值计算[J]. 土木工程学报,2013,46(05):122-128.
Zhao S C, Yu Z X, Wei T, et al. Test study of force mechanism and numerical calculation of safety netting system China Civil Engineering Journal,2013,46(05):122-128.
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