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| Study on impact resistance of a resilient steel canopy protection system |
| YU Zhixiang1，2，3，ZHANG Lijun1，3，LUO Liru1，3，JIN Yuntao1，3，ZHAO Lei1，3，QI Xin1，3，ZHAO Shichun1，2，3 |
| (1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. National Engineering Laboratory for Prevention and Control of Geological Disasters in Land Transportation，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. Research Center for Protection Structures Against Natural Hazards，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
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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.
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HUANG Fuyou1, 2, ZHANG Luqing1*, ZHOU Jian3, SUN Qihao4, WANG Song1, 2, HAN Zhenhua1, 2. Dynamic response and energy dissipation characteristics of sand-tire composite cushion under impact loading[J]. , 2026, 45(3): 933-945. |
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2020, Vol. 39 
