近接隧道交叉段围岩稳定性分析研究

发布时间：2018-04-25 01:07

本文选题：铁路隧道 + 交叉段　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：随着现代隧道交通事业的发展,越来越多的隧道交叉现象开始出现,施工难度也逐渐增大,尤其是在地质条件复杂、两近接隧道交叉的地段,为确保围岩安全稳定,支护设计方案往往偏于保守,造成浪费的同时增加了施工质量和安全风险,如何确定复杂地质条件下快速铁路近接隧道交叉段围岩应力应变规律,减少围岩失稳破坏,定量确定相关因素对交叉隧道围岩稳定性的影响是快速铁路近接隧道交叉段施工中要研究和解决的重点工作。本文依托新建铁路前阳至庄河DT2标段草莓沟2“隧道下穿盘道岭公路隧道,通过应用Hoek-Brown强度准则、Mohr-Coulomb屈服准则、路基沉降控制理论,经理论推导,得到了在上下隧道小净距影响下的塑性区范围及其相应解析解；通过对围岩变形和应力以及围岩稳定性相关参数进行计算、模拟、分析,对交叉隧道围岩的稳定性进行了综合评价。采用理论研究、数值模拟、现场监测综合研究法,从三个阶段展开研究,以工程地质资料结合现场工况勘查入手,确定隧道数值模拟参数,进而进行隧道支护和无支护情况下的隧道围岩变形的计算。将监测数据归纳整理得到交叉隧道围岩变形规律,同时与数值模拟的结果进行对照。为近接隧道交叉段围岩稳定性研究拓宽了思路,同时为今后同类工程应用提供了有益的参考价值。
[Abstract]:With the development of modern tunnel traffic, more and more tunnel crossing phenomena appear and the construction difficulty increases gradually, especially in the area where the geological conditions are complex and the two adjacent tunnels cross, in order to ensure the safety and stability of surrounding rock. The support design scheme is often conservative, which causes waste and increases the construction quality and safety risk. How to determine the stress and strain law of the surrounding rock in the cross section of the fast railway near the tunnel under complex geological conditions, and reduce the failure of the surrounding rock instability. Quantificationally determining the influence of relevant factors on the stability of surrounding rock of cross tunnel is the key work to be studied and solved in the construction of fast railway near tunnel crossing section. This paper relies on the new railway from Qianyang to Zhuanghe DT2 section of the Zhuangou 2 "tunnel under the Pandaoling Highway Tunnel, through the application of Hoek-Brown strength criterion Mohr-Coulomb yield criterion, subgrade settlement control theory, through theoretical derivation. The range of plastic zone and its corresponding analytical solution under the influence of small net distance between upper and lower tunnels are obtained, and the parameters related to the deformation and stress of surrounding rock as well as the stability of surrounding rock are calculated, simulated and analyzed. The stability of cross tunnel surrounding rock is evaluated. Using the methods of theoretical research, numerical simulation and field monitoring, the paper starts with three stages, starting with engineering geological data and site investigation, determines the parameters of tunnel numerical simulation. Then, the deformation of surrounding rock of tunnel is calculated under the condition of tunnel support and no support. The deformation law of cross tunnel surrounding rock was obtained by summarizing the monitoring data, and the results were compared with the results of numerical simulation. It also provides a useful reference for the application of similar projects in the future.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2

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