韧性挑篷防护网系统抗冲击性能研究

doi:10.13722/j.cnki.jrme.2020.0576

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摘要为了提升艰险山区道路的落石防护韧性，提出一种可用于山区道路落石防护的韧性挑篷防护网系统。分析防护系统阻尼与韧性的相关性，建立柔性防护挑篷的落石抛出控制方法及冲击力计算方法，据此构建防护系统机制模型。设计三联足尺模型，基于大型落锤冲击试验台开展能量为150和500 kJ的冲击试验，通过高速摄相机、动态数据采集仪进行试验数据采集，分析试验模型的主要冲击动力响应特征。建立动力非线性力学模型，开展扩展参数的显式动力分析，全面地研究系统冲击动力响应。研究发现，系统冲击响应具有大变形张紧、回弹、自恢复三阶段特征；按提出的方法，可控制落石抛出，降低系统损伤；经测量，系统残余变形为初始垂度的9.3%～16.8%，显著低于既有柔性防护结构，表现出良好的韧性；与赫兹碰撞理论解析解相比，防护系统的试验冲击力降幅达99%；提出考虑缓冲大变形影响的冲击力计算方法，计算结果与试验或数值模拟结果相比，误差不超过6%。

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	余志祥1
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	张丽君1
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	骆丽茹1
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	金云涛1
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	赵雷1
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	齐欣1
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	赵世春1
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关键词 ：工程地质, 落石, 棚洞, 韧性结构, 冲击与防护, 足尺试验

Abstract：To improve the resilience of the rockfall protection system in remote mountain areas，a resilient steel canopy structure was proposed for rockfall protection in this paper. The correlation between system damping and resilience was analyzed，and a rockfall trajectory control model and an evaluation method of the impact force were established. Consequently，a mechanism model of the resilient steel canopy protection system was constructed. A full-scale impact test model composed of three units was conducted，and impact tests were carried out with impact energy of 150 and 500 kJ based on a large-scale impact test platform. The test data were collected by a high-speed camera and a dynamic data acquisition instrument，and the impact responses were analyzed. A dynamic nonlinear model was established，and the explicit dynamic analysis was carried out. The study shows that the impact response roughly experiences three stages such as large deflection with high tension，spring back and system recovery. According to the design method proposed in this paper，rocks¢ throwing out is controllable and the damage of the system can be reduced. The residual deflection of the net is 9.3%–16.8% of the initial deflection，which is significantly lower than the existing flexible protection system，showing very strong resilience. Compared to the analytical solution of the Hertz collision theory，the impact force is reduced by 99%. A calculation method for the impact force was proposed considering the influence of large deflection，and the errors are less than 6% compared with the test results.

Key words： engineering geology')" href="#">

engineering geology rockfall shed-tunnel resilient structure impact and protection ')" href="#">full-scale test

引用本文:

余志祥1，2，3，张丽君1，3，骆丽茹1，3，金云涛1，3，赵雷1，3，齐欣1，3，赵世春1，2，3. 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): 2505-2516.
YU Zhixiang1，2，3，ZHANG Lijun1，3，LUO Liru1，3，JIN Yuntao1，3，ZHAO Lei1，3，QI Xin1，3，ZHAO Shichun1，2，3. Study on impact resistance of a resilient steel canopy protection system. , 2020, 39(12): 2505-2516.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0576 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I12/2505

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