柔性棚洞在陡崖落石灾害防治中的应用研究

Research on the application of flexible shed tunnel in the prevention of rockfall hazard

晋(城)-济(源)高速公路山西晋城段拍盘隧道(K1081+266)出口为隧接桥,最大的桥墩高差约为50 m,洞顶边坡坡体陡峻、岩体裸露、节理裂隙发育,自通车以来共发生8起崩塌落石事件。针对拍盘隧道出口隧接桥现状和应急抢险要求,分析了落石产生坠落原因、类型和落石运动规律,并利用LS-DYNA对柔性钢棚洞进行冲击模拟,结果表明:在相同的防护能级条件下,柔性钢棚洞在结构受力、施工、环保以及经济性等方面有显著的优势,适用于交通应急工程,可为类似工程提供参考和借鉴。

In view of the steep slope,exposed rock mass and joint crack development of Paipan tunnel slope( K1081 + 266) from Jincheng to Jiyuan highway,there are a total of 8 rockfall events since its opening. According engineering characteristics of Paipan tunnel,flexible steel shelter is applied,which install on the anti-collision wall. LS-DYNA is used to simulate rockfall impact,the results show that under the same protective energy level,flexible steel shed has significant advantages in stress,construction,environmental protection and economy,and is suitable for traffic emergency engineering,whicn can provide reference for similar projects.