被动柔性拦截网在长昆线某边坡防护工程中的应用

Application of Flexible Rockfall Protective Structure in the Slope Protection of Chang-kun Line

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。

Considering enormous damage to flexible protective structures,combined with the application of new high-speed railway to Chang-Kun segment of Shanghai-Kunming line,for ensuring that the RXI-200 structure has sufficient impact resistance,we carried out numerical simulations and full-scale test.First,by using numerical simulation technology,we simulated the whole process of rockfall impact on passive flexible structure and studied the deformation characteristics and the weaknesses of system.Based on the results of numerical simulation we put forward the corresponding recommendations for improvement.Then we carried out the full-size test of the improved structure.The system successfully intercepted 2000 kJ rockfall impact energy.Numerical and experimental results show that：the improved RXI-200 system has high deformation and energy dissipation capacity,also has the rockfall impact resistance expected.