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针对目前国内被动柔性拦截网应用中大量破坏的现状,结合新建沪昆线长昆段高速铁路沿线设置的防落石冲击的被动柔性拦截网实际工程,为保证所采用的RXI-200拦截网结构具有足够的抗落石冲击性能,开展了数值仿真模拟和足尺试验研究。采用数值仿真技术,模拟了落石冲击被动柔性拦截网的全过程,研究了该系统的变形特征和系统中的薄弱环节。基于数值仿真的结果,对系统提出了相应的改进建议。对改进后的结构,开展了原尺寸的落石冲击试验,系统成功拦截2000kJ能量的落石冲击。数值计算及试验研究结果表明:改进后的RXI-200被动柔性拦截网具有良好的变形能力和耗能能力,能达到预计的抗落石冲击能力。
In view of the current situation of large amount of damage in passive flexible intercepting network in China and the practical project of passive flexible intercepting net against falling rocks set along the Chang-Kun section of Shanghai-Kunming expressway, in order to ensure that the adopted RXI-200 intercepting network structure has Enough anti-rockfall impact performance, carried out numerical simulation and full-scale test study. Numerical simulations were used to simulate the whole process of passive rock interception by rockfall impacting. The deformation characteristics of the system and the weak links in the system were studied. Based on the results of numerical simulation, the corresponding improvement suggestions are put forward for the system. The improved structure, carried out the original size of rockfall impact test, the system successfully intercept 2000kJ energy rockfall. The numerical calculation and experimental results show that the improved RXI-200 passive flexible interception network has good deformation ability and energy dissipation capability, and can achieve the expected impact resistance of rockfall.