张吉怀铁路土峪隧道危岩落石特征及防护措施研究  

Study on the Characteristics and Protection Design of Tuyu Tunnel Rockfall on Zhangjiajie-Jishou-Huaihua Railway

作　　者：汪莹鹤[1] 李时亮[1] 李炜 谭家华[1] 郭周富 WANG Yinghe;LI Shiiang;LI Wei;TAN Jiahua;GUO Zhoufu(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]中铁二院工程集团有限公司,成都610031

出　　处：《铁道标准设计》2023年第11期126-133,共8页Railway Standard Design

基　　金：国家重点研发计划课题(2021YFB2600400);中铁第四勘察设计院集团有限公司科技研究开发项目(2020K042)。

摘　　要：山区铁路隧道进出口常面临危岩落石的威胁,依托张吉怀铁路开展高陡边坡危岩落石勘察及防护措施研究。土峪隧道进出口山体陡峭,竖向节理发育,岩体破碎,分布大量危岩落石,对铁路施工及运营构成巨大威胁。通过遥感解译、三维激光扫描、现场调查等“空-天-地”综合勘察手段,查清了土峪隧道进出口的危岩落石分布范围和特征;采用落石模拟软件Rockfall对洞口落石的运动轨迹进行模拟,分析落石的影响范围、冲击速度、弹跳高度和冲击能量,结合土峪隧道进出口地形、地质条件,提出“清除锚固+棚洞/明洞+主被动网”的综合防护措施;最后,总结形成了山区铁路隧道口硬质岩陡峭边坡危岩落石的勘察方法和加固防护设计原则。The entrance and exit of railway tunnels in mountainous areas often face the threat of dangerous rock falling,and this article relies on the Tuyu Tunnel of Zhangjiajie-Jishou-Huaihua Railway to study the characteristics of dangerous rock falling on the high and steep slopes and the protective measures.At the entrance and exit of the Tuyu Tunnel,the slope was steep,the vertical joint was developed,the rock mass was broken,and a large number of dangerous rocks were distributed,which posed a great threat to the construction and operation.The “Air-Sky-Earth” comprehensive survey method,such as remote sensing interpretation,three-dimensional laser scanning,and site survey,was used to find out the distribution range and characteristics of rockfalls at the entrance and exit of the Tuyu Tunnel;The simulation software Rockfall was used to simulate the motion trajectory of the rockfalls,analyze the impact range,impact speed,bounce height and shock energy of the rockfalls,and combined with the terrain and geological conditions of the entrance and exit of the Tuyu Tunnel,the comprehensive protective measures of “Clearing and anchoring+Open-cut tunnel/shed tunnel+Active and passive network” were proposed;Finally,the investigation method and the design principle of reinforcement and protection for the steep slope of hard rock in mountain railway tunnel are summarized.

关 键 词：铁路隧道 危岩落石 综合勘察 桥隧相接 防护措施 

分 类 号：U25[交通运输工程—道路与铁道工程] U459.1[建筑科学—桥梁与隧道工程] TU45