柔性落石防护系统丝束环形网拉–弯刚度协调模型

doi:10.13722/j.cnki.jrme.2022.0294

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (22335 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要常用于柔性防护系统的环形网由离散的高强钢丝束编制而成，广泛用于落石灾害防护。既有研究中，环形网常等效为等截面积的圆截面梁单元，该方法无法解决网环的拉–弯刚度协调及失效预测难题。为此，引入网环离散丝束截面的抗拉、抗弯刚度修正系数及拉–弯刚度协调因子，构建了网环的拉–弯刚度协调模型。开展单环和环链拉伸试验以明确模型等效参数，同时揭示了网环接触区失效机制。进一步开展网片冲击试验，比较分析冲击变形、冲击力和网片极限承载能量等关键动力响应指标，分析结果显示，模型的预测误差分别为3.0%，6.6%和5.9%，相较既有等截面模型，对网片极限承载能量的预测精度平均可提高20.4%。拉–弯刚度协调模型能够实现环形网加载刚度和失效点的准确预测，可显著提升落石柔性防护系统的设计精度。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	金云涛1
	2
	余志祥1
	2
	3
	郭立平1
	2
	骆丽茹1
	2
	张丽君1
	2
	廖林绪1
	2

关键词 ：防护工程, 落石柔性防护, 环形网, 拉&ndash, 弯刚度, 失效机制, 极限承载力

Abstract：Wire-ring nets，consisted of discrete wire bundles，are commonly used for flexible protection system in the field of rockfall disaster protection. The wire-ring nets? numerical models in existing research simplify the discrete wire-bundle section into a circular section with equivalent area，which can?t realize the equivalent tensile-bending stiffness of the ring section and is still difficult to accurately predict the failure of wire-ring nets. In this paper，a tensile-bending coordinated model was hereby established by introducing the tensile，bending stiffness correction factors and tensile-bending stiffness coordinated factor of the ring?s discrete wire-bundle section. The tensile tests of single rings and ring chains were carried out to determine the model parameters，and the failure mechanism of the wire-rings in contact area was revealed. The nets impact tests were further carried out，and the key indexes such as impact displacement，impact forces and ultimate bearing energy were analyzed，with relative error 3.0%，6.6% and 5.9% respectively. Compared to the existing area equivalent model，the ultimate capacity prediction accuracy of the new model can be increased by 20.4% in average. The tensile-bending coordinated model can predict the loading stiffness and failure accurately，which improves the design accuracy of flexible rockfall protection system.

Key words： protection engineering flexible rockfall protection wire-ring net；tensile-bending stiffness failure mechanism ultimate bearing capacity

引用本文:

金云涛1，2，余志祥1，2，3，郭立平1，2，骆丽茹1，2，张丽君1，2，廖林绪1，2. 柔性落石防护系统丝束环形网拉–弯刚度协调模型[J]. 岩石力学与工程学报, 2023, 42(3): 698-707.
JIN Yuntao1，2，YU Zhixiang1，2，3，GUO Liping1，2，LUO Liru1，2，ZHANG Lijun1，2，LIAO Linxu1，2. Tensile-bending stiffness coordinated model for wire-ring nets in flexible rockfall protection system. , 2023, 42(3): 698-707.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0294 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/698

[23]	FITYUS S G，GIACOMINI A，BUZZI O. The significance of geology for the morphology of potentially unstable rocks[J]. Engineering Geology，2013，162：43-52.
[19]	YU Z X，LIU C，GUO L，et al. Nonlinear numerical modeling of the wire-ring net for flexible barriers[J]. Shock and Vibration，2019，2019：1-23.
[1]	阳友奎. 边坡柔性加固系统设计计算原理与方法[J]. 岩石力学与工程学报，2006，25(2)：217-225.(YANG Youkui. Concepts and method of slope flexible stabilization system[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(2)：217-225.(in Chinese))
[4]	齐欣，许浒，余志祥，等. 柔性拦截结构中减压环动态力学性能试验研究[J]. 工程力学，2018，35(9)：198-206.(QI Xin，XU Hu，YU Zhixiang，et al. Dynamic mechanical property study of brake rings in flexible protective system[J]. Engineering Mechanics，2018，35(9)：198-206.(in Chinese))
[5]	余志祥，张丽君，骆丽茹，等. 韧性挑篷防护网系统抗冲击性能研究[J]. 岩石力学与工程学报，2020，39(12)：2 505-2 516.(YU Zhixiang，ZHANG Lijun，LUO Liru，et al. Study on impact resistance of the resilient steel canopy protection system[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(12)：2 505-2 516.(in Chinese))
[7]	刘泽，黄向京，杨果林. 组合式面板双绞合六边形钢丝网加筋土挡墙现场试验研究[J]. 岩土力学，2011，32(11)：3 295-3 300.(LIU Ze，HUANG Xiangjing，YANG Guolin. Study of a combined panel earth retaining wall reinforced with double twisted hexagonal wire mesh by using site test[J]. Rock and Soil Mechanics，2011，32(11)：3 295-3 300.(in Chinese))
[9]	郭立平，余志祥，骆丽茹，等. 基于力流等效的环形网顶破力学行为解析方法[J]. 工程力学，2020，37(5)：129-139.(GUO Liping，YU Zhixiang，LUO Liru，et al. An analytical method of puncture mechanical behavior of ring nets based on the load path equivalence[J]. Engineering Mechanics，2020，37(5)：129-139.(in Chinese))
[11]	GRASSL H，VOLKWEIN A，ANDERHEGGEN E，et al. Steel-net rockfall protection-experimental and numerical simulation[J]. Structures Under Shock and Impact，2002，63(1)：1-11.
[13]	COULIBALY J B，CHANUT M-A，LAMBERT S，et al. Non-linear discrete mechanical model of steel rings[J]. Journal of Engineering Mechanics，2017，143(9)：04017087.
[16]	JIN Y，YU Z，LUO L，et al. A membrane equivalent method to reproduce the macroscopic mechanical responses of steel wire-ring nets under rockfall impact[J]. Thin-Walled Structures，2021 167：108227.
[17]	ESCALLÓN J P，WENDELER C，CHATZI E，et al. Parameter identification of rockfall protection barrier components through an inverse formulation[J]. Engineering Structures，2014，77：1-16.
[21]	齐欣，余志祥，许浒，等. 被动柔性防护网结构的累计抗冲击性能研究[J]. 岩石力学与工程学报，2017，36(11)：2 788-2 797.(QI Xin，YU Zhixiang，XU Hu，et al. Cumulative impact resistance of passive flexible protective structure[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(11)：2 788-2 797.(in Chinese))
[2]	崔廉明，石少卿，汪敏，等. 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(2)：332-342.(CUI Lianming，SHI Shaoqing，WANG Min，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(2)：332-342.(in Chinese))
[3]	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.(LUO Xiang，SHI Shaoqing，WANG Min. Mechanical properties of RECCO ring in slope flexible protecting fence[J]. Subgrade Engineering，2010，(6)：45-47.(in Chinese))
[10]	NICOT F，CAMBOU B，MAZZOLENI G. From a constitutive modelling of metallic rings to the design of rockfall restraining nets[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2001，25：49-70.
[12]	GENTILINI C，GOTTARDI G，GOVONI L，et al. Design of falling rock protection barriers using numerical models[J]. Engineering Structures，2013，50(5)：96-106.
[14]	COULIBALY J B，CHANUT M-A，LAMBERT S，et al. Toward a generic computational approach for flexible rockfall barrier modeling[J]. Rock Mechanics and Rock Engineering，2019，52(11)：4 475-4 496.
[15]	MENTANI A，GOVONI L，GIACOMINI A，et al. An equivalent continuum approach to efficiently model the response of steel wire meshes to rockfall impacts[J]. Rock Mechanics and Rock Engineering，2018，49(4)：1 247-1 262.
[22]	HAMBLETON J P，BUZZI O，GIACOMINI A，et al. Perforation of flexible rockfall barriers by normal block impact[J]. Rock Mechanics and Rock Engineering，2013，46(3)：515-526.
[8]	赵雅娜，余志祥，赵世春. 柔性防护系统环形拦截网分区等代模型[J]. 西南交通大学学报，2019，54(4)：808-815.(ZHAO Yana，YU Zhixiang，ZHAO Shichun. Numerical compution method for a flexible passive network structure with multi-span distributed ring network[J]. Journal of Southwest Jiaotong University，2019，54(4)：808-815.(in Chinese))
[20]	HU X，CRISTINA G，ZHIXIANG Y，et al. An energy allocation based design approach for flexible rockfall protection barriers[J]. Engineering Structures，2018，173：831-852.
[24]	黄润秋，刘卫华. 基于正交设计的滚石运动特征现场试验研究[J]. 岩石力学与工程学报，2009，28(5)：882-891.(HUANG Runqiu，LIU Weihua. In-site test study of characteristics of rolling rock blocks based on orthorginal design[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(5)：882-891.(in Chinese))
[6]	ESCALLON J P，BOETTICHER V，WENDELER C，et al. Mechanics of chain-link wire nets with loose connections[J]. Engineering Structures，2015，101(OCT.15)：68-87.
[18]	ESCALLÓN J P，VON BOETTICHER A，WENDELER C，et al. Mechanics of chain-link wire nets with loose connections[J]. Engineering Structures，2015，101：68-87.
[25]	章广成，向欣，唐辉明. 落石碰撞恢复系数的现场试验与数值计算[J]. 岩石力学与工程学报，2011，30(6)：1 266-1 273.(ZHANG Guangcheng，XIANG Xin，TANG Huiming. Field test and numerical calculation of restitution coefficient of rockfall collision[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 266-1 273.(in Chinese))