V型冲沟落石防护结构设计

为了解决危岩落石对山区高铁运营的威胁,并改善乘车的舒适度,以宝兰客运专线南马棕山隧道和千家沟隧道之间的大水沟落石防护结构设计为背景,提出锚索(锚杆)框架梁边坡防护与拱形明洞相结合的综合防护设计方法;根据地形、地质情况,结合受力分析,拱形明洞防护结构独立于桥设计,其基础采用纵梁+墩、钻孔桩;应用有限元对落石的运动轨迹、冲击能量及拱形明洞结构进行数值模拟,验证了结构布置的合理性及安全性。

Case Study on Design of Rockfall Protection Structure in V-shaped Gully

Rock falling is a threat to the operation of high-speed railways in mountain areas. A comprehensive rockfall protection structure, which consists of anchor frame beam side slope protection and arched open-cut tunnel, is proposed for the rockfall protection structure between South Mazongshan tunnel and Qianjiagou tunnel on Baoji-Lanzhou passenger- dedicated railway. The mode of ＂longitudinal beam ＋ bored pile＂ is adopted for the foundation of the arched open-cut tunnel according to the topographical and geological conditions and the force analysis results. The rationality and safety of the protection structure is verified by finite element numerical simulation on the trajectory and impact energy of the falling rocks and on the structure of the arched open-cut tunnel.