川藏公路102隧道复杂地质环境围岩超前预报与开挖方法研究

发布时间：2018-04-27 13:45

  本文选题：102隧道 + 超前地质预报　； 参考：《重庆交通大学》2014年硕士论文

【摘要】：随着我国国民经济和社会的高速发展，国家基础设施建设不断扩大，隧道及地下工程大量涌现，但隧道在建设和运营中各种工程事故也不断发生，尤其在施工阶段，由于隧道及地下工程开挖具有很强隐蔽性，而且山体内地质情况由于不易控制，稍有不慎便会造成重大事故，给国家造成重大损失。因此，论文针对川藏公路102隧道超前地质预报与开挖方法展开研究，在收集整理该工程区域的地质资料与该工程设计资料的基础上，通过分析该工程的地质特点与该地区类似工程经验，选择适合本工程的超前地质预报方法，，对隧道进行超前地质预报，以补充初期勘探资料不能满足隧道施工的要求。另外对本工程采用的开挖方法进行施工阶段的数值模拟分析，以期对隧道所穿越的软弱围岩进行施工方案的优化，为现场施工提供参考和指导。 论文依托工程为川藏公路102隧道，102隧道地处102大滑坡群，地质条件复杂，隧道穿越多个断层破碎带。为了保证隧道安全快速施工，论文主要开展了以下工作： ①在调查该区域的地质情况、收集整理102隧道区域的工程地质资料、详细阅读该工程的设计文件的基础上，并结合该区域类似工程的经验和超前地预报方法的优缺点，选择适合本工程的超前地质预报方法。 ②详细探讨了地质雷达的基本原理和优缺点，分析了地质雷达在预报过程中相关参数的选取和测线的布置。并通过地质雷达超前预报在102隧道中的应用，总结了地质雷达图像与不良地质之间的对应关系。即地质雷达图像对不良地质的反射波特征。 ③采用有限元软件，分析隧道穿越不同围岩级别时，围岩的变形特征。并通过分析开挖面与围岩分界面不同距离时的拱顶位移变化规律，认为利用监控量测数据进行超前地质预报是可行的。 ④结合川藏公路102隧道的开挖方法和工程地质环境，对102隧道所采用的两台阶法施工进行优化研究，确定隧道在Ⅳ、Ⅴ级围岩段施工过程中上台阶合理开挖高度与上下台阶之间合理间距，为现场快速施工提供指导。
[Abstract]:With the rapid development of China's national economy and society, the construction of national infrastructure has been expanding, and tunnels and underground projects have sprung up in large numbers. However, various engineering accidents also occur in the construction and operation of tunnels, especially in the construction stage. Because of the strong concealment of the excavation of tunnels and underground works, and because the geological conditions in the mountains are not easy to control, a slight carelessness will cause serious accidents and cause great losses to the country. Therefore, based on the geological prediction and excavation method of tunnel 102 of Sichuan-Tibet Highway, this paper collects and arranges the geological data of the project area and the design data of the project. By analyzing the geological characteristics of the project and the similar engineering experience in this area, the authors select the advanced geological forecast method suitable for the project, and carry out the advance geological forecast for the tunnel, so that the initial exploration data can not meet the requirements of tunnel construction. In addition, the excavation method adopted in this project is simulated and analyzed in the construction stage, in order to optimize the construction scheme of the soft surrounding rock through which the tunnel passes, and to provide reference and guidance for the field construction. The paper relies on the project for tunnel 102 of Chuanzang Highway, which is located in 102 large landslide group. The geological conditions are complex, and the tunnel passes through several fault broken zones. In order to ensure the safe and rapid construction of the tunnel, the thesis mainly carried out the following work: 1 on the basis of investigating the geological situation of the area, collecting and arranging the engineering geological data of the 102 tunnel area, reading the design documents of the project in detail, and combining the experience of similar projects in this area and the advantages and disadvantages of the advanced prediction method, The advanced geological prediction method suitable for this project is selected. (2) the basic principle, advantages and disadvantages of GPR are discussed in detail, and the selection of relevant parameters and the layout of measuring lines in the process of GPR prediction are analyzed. Through the application of GPR in tunnel 102, the relationship between GPR image and bad geology is summarized. That is, the reflection wave characteristics of geological radar image to bad geology. Using finite element software, the deformation characteristics of surrounding rock when tunnel passes through different surrounding rock levels are analyzed. By analyzing the variation law of arch displacement at different distances between excavated surface and surrounding rock, it is considered that it is feasible to use monitoring data to carry out geological prediction ahead of time. 4 combined with the excavation method and engineering geological environment of tunnel 102 of Chuan-Tibet Highway, the optimization of the construction of tunnel 102 by two step methods is carried out, and the tunnel in 鈪

本文编号：1810972