Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level

WU Hao; WU Yifan; MA Liangliang

doi:10.11883/bzycj-2024-0150

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WU Hao, WU Yifan, MA Liangliang. Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0150

Citation:

WU Hao, WU Yifan, MA Liangliang. Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0150

WU Hao, WU Yifan, MA Liangliang. Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0150

Citation:

WU Hao, WU Yifan, MA Liangliang. Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0150

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Design of passive flexible barrier against rockfall impact with 8 000 kJ energy level

doi: 10.11883/bzycj-2024-0150

College of Civil Engineering, Tongji University, Shanghai 200092, China

Received Date: 2024-05-23
Rev Recd Date: 2024-07-11

Available Online: 2024-07-15

Abstract

Abstract

The protection level and domestic standard test level of commonly used passive flexible barriers against rockfall impact are not higher than 5 000 kJ, while bridges in mountains and other important transportation infrastructures are facing rockfall disaster threats with higher impact energy levels. Considering that the design method for passive flexible barriers with higher impact energy levels is lacking, to provide a feasible and reliable tool for the infrastructure engineers, the analysis and design of 8 000 kJ-level passive flexible barrier against rockfall impact were carried out at present based on the numerical simulation method. Firstly, by adopting the explicit dynamic software ANSYS/LS-DYNA, quasi-static tests, including the tensile test on single wire ring and three-ring chain, net puncturing test, and the dynamic impact test, i.e., 2 000 kJ rockfall impacting the full-scale passive flexible barrier, were numerically reproduced, and the reliability of the numerical simulation method was fully verified by comparing with the experimental data, i.e., the maximum breaking force and breaking displacement of the wire ring and its failure characteristics, the whole impact process of rockfall, and the cable force-time history curves. The influencing factors, i.e., the inclining angle, span, and height of the steel post and different specifications of energy dissipating devices ranging from 50 kJ to 70 kJ, on the dynamic behavior of the passive flexible barrier were further analyzed. The results show that the specification of the energy dissipation device is the most critical parameter controlling the internal force and displacement of the passive flexible barrier. The inclining angle of the steel post is recommended to be 10°. An increase in the post spacing can reduce the in-plane stiffness of the structure while having less effect on the transverse anchorage. An increase in the post height will cause a significant increase in the support reaction force at the post bottom. A reasonable adjustment of the anchorage position of each wire rope is required when the post height and spacing are changed. Finally, based on the results of parameter analysis, two design schemes for a passive flexible barrier against 8 000 kJ rockfall impact were given by adjusting the geometry of the structure, the specification of the energy dissipating device, and the addition of transmission support ropes. Both of them passed the test of the European standard EAD 340059-00-0106.
- passive flexible barrier,
- rockfall impact,
- parameter influence,
- structural design

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References(25)

References

[1]	SMITH D, DUFFY J D. Field tests and evaluation of rockfall restraining nets: No. CA/TL-90/05 [R]. USA: State of California Department of Transportation, 1990.
[2]	PEILA D, PEIZZA S, SASSUDELLI F. Evaluation of behaviour of rockfall restraining nets by full scale tests [J]. Rock Mechanics and Rock Engineering, 1998, 31(1): 1–24. DOI: 10.1007/s006030050006.
[3]	GRASSL H, VOLKWEIN A, ANDERHEGGEN E, et al. Steel-net rockfall protection-experimental and numerical simulation [C]//Proceedings of the 7th International Conference on Structures Under Shock and Impact. Montreal, Canada: Wit Press, 2002, 143–153.
[4]	BUZZI O, LEONARDUZZI E, KRUMMENACHER B, et al. Performance of high strength rock fall meshes: effect of block size and mesh geometry [J]. Rock Mechanics and Rock Engineering, 2015, 48(3): 1221–1231. DOI: 10.1007/s00603-014-0640-7.
[5]	YU Z X, LIU C, GUO L, et al. Nonlinear numerical modeling of the wire-ring net for flexible barriers [J]. Shock and Vibration, 2019: 3040213. DOI: 10.1155/2019/3040213.
[6]	ZHAO L, YU Z X, LIU Y P, et al. Numerical simulation of responses of flexible rockfall barriers under impact loading at different positions [J]. Journal of Constructional Steel Research, 2020, 167: 105953. DOI: 10.1016/j.jcsr.2020.105953.
[7]	赵雷, 邹定富, 张丽君, 等. 落石被动柔性防护网冲击力学响应的参数化研究 [J]. 振动与冲击, 2023, 42(12): 8–17. DOI: 10.13465/j.cnki.jvs.2023.012.002. ZHAO L, ZOU D F, ZHANG L J, et al. Parametric study on the mechanical response of a flexible rockfall barrier [J]. Vibration and Shock, 2023, 42(12): 8–17. DOI: 10.13465/j.cnki.jvs.2023.012.002.
[8]	KOO R C H, KWAN J S H, LAM C, et al. Dynamic response of flexible rockfall barriers under different loading geometries [J]. Landslides, 2017, 14(3): 905–916. DOI: 10.1007/s10346-016-0772-9.
[9]	QI X, PEI X J, HAN R, et al. Analysis of the effects of a rotating rock on rockfall protection barriers [J]. Geotechnical and Geological Engineering, 2018, 36(5): 3255–3267. DOI: 10.1007/s10706-018-0535-6.
[10]	MOON T, OH J, MUN B. Practical design of rockfall catchfence at urban area from a numerical analysis approach [J]. Engineering Geology, 2014, 172: 41–56. DOI: 10.1016/j.enggeo.2014.01.004.
[11]	YU Z X, LUO L, LIU C, et al. Dynamic response of flexible rockfall barriers with different block shapes [J]. Landslides, 2021, 18(7): 2621–2637. DOI: 10.1007/s10346-021-01658-w.
[12]	GERBER W. Guideline for the approval of rockfall protection kits: environment in practice [R]. Bern, Switzerland: Swiss Agency for the Environment, Forest and Landscape (SAEFL), Swiss Federal Research Institute (WSL), 2001.
[13]	HIGGINS J D. Recommended procedure for the testing of rock-fall barriers: NCHRP Project 20–07, Task 138 [R]. Washington, USA: National Cooperative Highway Research Program, Transportation Research Board, 2003.
[14]	ETOA. Falling rock protection kits: EAD 340059-00-0106 [S]. Brussels: European Organization for Technical Approvals, 2018.
[15]	国家铁路局. 铁路边坡柔性被动防护产品落石冲击试验方法与评价: TB/T 3449—2016 [S]. 北京: 中国铁道出版社, 2016.
[16]	中华人民共和国交通运输部. 边坡柔性防护网系统: JT/T 1328—2020 [S]. 北京: 人民交通出版社, 2020.
[17]	李自名. 柔性拦截网顶破力学行为研究 [D]. 成都: 西南交通大学, 2019: 19–29.
[18]	郭立平. 柔性防护工程环连网静动力行为与破坏力学模型 [D]. 成都: 西南交通大学, 2023: 32–41.
[19]	YU Z X, QIAO Y K, ZHAO L, et al. A simple analytical method for evaluation of flexible rockfall barrier part 2: application and full-scale test [J]. Advanced Steel Construction, 2017, 14(2): 142–165. DOI: 10.18057/IJASC.2018.14.2.2.
[20]	齐欣. 柔性被动拦截网结构力学性能研究 [D]. 西南交通大学, 2014: 126–131.
[21]	罗祥, 石少卿, 汪敏. 边坡柔性防护网中RECCO圆环力学性能研究 [J]. 路基工程, 2010(6): 45–47. DOI: 10.3969/j.issn.1003-8825.2010.06.016. LUO X, SHI S Q, WANG M. Study on mechanic properties of RECCO ring in slope flexible protecting fence [J]. Subgrade Engineering, 2010(6): 45–47. DOI: 10.3969/j.issn.1003-8825.2010.06.016.
[22]	ESCALLóN J P, WENDELER C, CHATZI E N, et al. Parameter identification of rockfall protection barrier components through an inverse formulation [J]. Engineering Structures, 2014, 77: 1–16. DOI: 10.1016/j.engstruct.2014.07.019.
[23]	BOYCE B L, DILMORE M F. The dynamic tensile behavior of tough, ultrahigh-strength steels at strain-rates from 0.0002 s^–1 to 200 s^–1☆ [J]. International Journal of Impact Engineering, 2009, 36(2): 263–271. DOI: 10.1016/j.ijimpeng.2007.11.006.
[24]	LSTC. LS-DYNA keyword userʼs manual volume Ⅰ [M]. California: Livermore Software Technology Corporation (LSTC), 2013: 2068–2073.
[25]	四川省质量技术监督局. 公路被动柔性防护网技术规程: DB51/T 2432—2017 [S]. 北京: 人民交通出版社, 2017.