【作者】 胡健；

【导师】 陈建勋；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 随着我国交通建设的发展,特别是西部大开发战略的实施,公路隧道方案在山区和丘陵地区高速公路建设中日益引起重视,一些大埋深、大跨度的隧道相继出现。为了探求大埋深条件下,隧道施工过程中围岩及支护衬砌结构的力学性态和安全性,以世界规模第一、长度第二的秦岭终南山公路隧道为依托,结合隧道的地质条件和工程条件,选择了东西线两个大埋深试验段,进行了施工监控量测和数值模拟分析。首先,对隧道结构力学状态和稳定性进行了现场测试。量测内容包括围岩压力、围岩内部位移、初期支护净空收敛、型钢钢架应力、喷射混凝土应力、锚杆轴力、初期支护与二次衬砌间的接触压力、二次衬砌混凝土应力及二次衬砌净空收敛等;同时对量测布置与实施过程中碰到的几个问题进行了思考和探讨。其次,应用有限元分析软件(MIDAS/GTS)对施工过程进行了数值模拟,分析了初期支护及二次衬砌变形和受力的特点。最后,通过现场监测数据和有限元数值模拟计算结果进行分析对比,对隧道围岩的稳定性与支护衬砌结构的安全性进行了评定。监测及计算结果表明,大埋深条件下,型钢钢架和喷射混凝土为主要受力结构,尤其是型钢钢架受力较大,作用显著;二次衬砌受力安全,工作状态良好,有足够的安全储备。更多还原

【Abstract】 With the development of traffic construction in china,especially the implement of western development strategy, highway tunnel option in the mountains and hills in expressway construction is in the growing attention and some embedded large depth, long-span tunnels appeared one after another.For seeking mechnical state and safety of surrounding rock and support lining structure under large embedded depth conditions during tunnel construction, taking Qingling Zhongnanshan highway tunnel as the background engineering which is the larggest scale and the second longgest highway tunnel in the world and considering tunnel’s geological and engineering conditions, constrction monitoring measurement and numerical analysis was taken for the two large embedded depth test sections respectively in east and west line.First, field test was taken to tunnel structure mechnical state and stability. The content of monitoring measurement included surrounding rock pressure, interior displacement of surrounding rock, initial support and clearance convergence, steel arch stress, shotcrete stress, anchor axial force, contact pressure between primary support and secondary lining, secondary lining concrete stress and secondary lining clearance convergence and so on. Meanwhile,some problems coming across during arrangement and implementation of monitoring measurement was also taken for considering and discussion.Secondly, characteristics of deformation and lining’s stress on primary support and secondary lining were analyzed by numerical simulation for construction process using finite elements analysis software (MIDAS/GTS).Finally, through the comparative analysis of field monitoring data and finite element numerical simulation results, the evaluation was taken on tunnel surrounding rock’s stability and support lining structure’s safety.Monitoring data and calculation results show that, on large embedded depth condition, steel arch and shotcrete are the main force structure, especially steel arch , significant role. Second lining of the security, good working conditions, there were enough safety reserves.更多还原