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

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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。

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	金云涛1
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	余志祥1
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	郭立平1
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	骆丽茹1
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	张丽君1
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	廖林绪1
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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:

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

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