危岩落石棚洞-拦石墙新型组合结构防护措施研究

Study on Rockfall Protection Measures of New⁃type Composite Structure of Rock Shed Tunnel and Retaining Wall

针对既有危岩落石防护措施满足不了铁路站场扩线防护范围需求的问题,以黔张常(黔江—张家界—常德)铁路张家界禾家村车站为背景,利用RocFall软件对边坡落石运动轨迹进行模拟,得出了落石运动能量和范围。在既有棚洞基础上,提出了一种棚洞与拦石墙相结合的新型防护结构。基于传统拦石墙稳定性计算,提出了棚洞-拦石墙新型组合结构稳定性计算公式并对其稳定性进行了验算。研究结果表明:棚洞-拦石墙新型组合结构能够抵抗落石冲击作用,安全稳定性系数较高;在既有棚洞上方修建拦石墙结构,能够增加拦石墙的有效高度。该新型结构能够克服场地狭小的限制,不影响铁路正常运营安全。

In view of the problem that the existing unstable rock fall protection measures cannot meet the requirements of railway station expansion protection range,taking the Hejiacun station in Zhangjiajie of Qianjiang-ZhangjiajieChangde railway as the background,the slope rockfall motion trajectory was simulated by RocFall software,and the rockfall motion energy and range were obtained. Based on the existing shed tunnel,a new protective composite structure of rock shed tunnel and retaining wall was proposed. Based on the traditional stability calculation of rock retaining wall,the stability calculation formula of new composite structure of rock shed tunnel and retaining wall was proposed,and its stability was checked. The results show that the new composite structure of rock shed tunnel and retaining wall can resist the impact of rockfall,and the safety and stability coefficient is relatively high.The construction of rock retaining wall structure above the existing shed tunnel can increase the effective height of the rock retaining wall. The new composite structure can overcome the limitation of narrow site and does not affect the normal operation safety of railway.