铁路隧道施工初期支护参数优化研究

发布时间：2018-01-29 02:16

本文关键词： 铁路隧道监控量测有限元分析参数优化　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：山西中南部铁路通道是我国第一条设计轴重30T新建重载铁路,本文以中南部铁路通道西铁车2号隧道施工为背景,对隧道支护参数进行了研究。论文首先在对实际监测数据分析的基础上,利用位移等级管理评估既有支护参数,并利用监测数据对有限元计算参数进行优化；其次,通过用有限元的计算分析对未开挖段围岩的变形趋势进行预测,评估当前支护参数的合理性,结合超前地质预报,对支护方案优化提出合理化建议。通过现场监测数据分析与有限元模拟得到如下结论：(1)位移等级管理在西铁车2号隧道施工中应用具有可行性,可通过位移等级管理进行隧道施工安全管理,评估支护效果,指导施工。(2)有限元模拟数据与实际监控量测存在偏差,但结果可靠,可以通过数值分析对未开挖隧道变形情况进行预测。(3)根据有限元模拟数值分析预测,西铁车2号隧道DK1079+280～DK1079+200段设计支护参数较弱,需重新进行设计以满足初期支护强度的要求。(4)新奥法隧道施工中支护参数的强弱直接影响隧道开挖后的变形,初期支护对控制围岩变形有重要作用,合理的支护参数可以控制围岩的变形,确保结构安全。通过模拟分析,发现西铁车2号隧道在中等～弱风化灰岩为主地质条件下,采用116型钢,间距1.2m,锚杆长度3.0m,环纵间距均1.2m,拱墙喷射混凝土厚度18cm,仰拱喷射混凝土厚度10cm的初期支护参数,可以有效控制围岩变形,位移可实现Ⅱ级管理,在打设超前小导管的超前支护下,可正常进行作业,经济效益好,无支护材料浪费。
[Abstract]:Shanxi central and southern railway passage is the first designed axle load 30T new heavy-haul railway in China. This paper takes the construction of West Rail car No. 2 Tunnel as the background. Firstly, based on the analysis of actual monitoring data, the existing support parameters are evaluated by displacement grade management, and the finite element calculation parameters are optimized by monitoring data. Secondly, the deformation trend of the surrounding rock in the unexcavated section is predicted by finite element analysis, and the rationality of the current supporting parameters is evaluated, combined with the advanced geological prediction. Through the analysis of field monitoring data and finite element simulation, the following conclusions are drawn: 1) the application of displacement grade management in the construction of No. 2 tunnel of West Railway Che is feasible. The safety management of tunnel construction can be carried out by displacement grade management, the support effect can be evaluated, and the finite element simulation data can be guided. 2) there is a deviation from the actual monitoring measurement, but the results are reliable. The deformation of unexcavated tunnel can be predicted by numerical analysis. The design support parameters of DK1079 280 DK1079200 section of West Railway Che No. 2 Tunnel are weak. It needs to be redesigned to meet the requirements of initial support strength.) the strength of support parameters in the construction of the New Austrian tunneling directly affects the deformation of the tunnel after excavation. The initial support plays an important role in controlling the deformation of surrounding rock. Reasonable supporting parameters can control the deformation of surrounding rock and ensure the safety of structure. Through simulation and analysis, it is found that the No. 2 tunnel of Xitie Che adopts 116 steel under the geological condition of medium to weak weathered limestone. The initial support parameters are 1.2m spacing, 3.0m bolt length, 1.2m ring longitudinal spacing, 18cm thickness of arch wall shotcrete and 10cm thickness of inverse-arch shotcrete. The deformation of surrounding rock can be effectively controlled and the displacement can be managed in the second grade. Under the advance support with small lead ducts, the work can be carried out normally, with good economic benefit and no waste of supporting materials.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.7

【共引文献】