Research On Construction Technology Of Li-jia-wan Tunnel Through The Bad Geology In The Bada Railway

At present, the development and utilization of underground space is the only way for the development of the world’s major cities. With the development of our country’s reform and development, the traffic can be developed rapidly, and the tunnel is an indispensable part of the transportation industry. China is a mountainous country, 60% of the total area of hills and highland in the southwest is numerous mountains, so tunnel construction is very important. In the process of tunnel construction, geological disasters such as landslides, rock burst, fault and so on, which directly affect the safety of tunnel construction and construction cost. Therefore, it is very important to analyze the tunnel geological disasters, and to develop reasonable prevention and disposal measures. This paper to Bada railway Li Jia Wan Tunnel adverse geological section as an example, according to the geological characteristics, develop geological disaster remediation programs, and through the numerical simulation to the feasibility of the scheme is verified, for future similar tunnel adverse geological section to provide a reference.The main contents of this paper include:(1) Combined with the engineering data, this paper systematically analyzes the bad geological conditions of Li Jia Wan Tunnel, and introduces the formation mechanism of the disease, and provides the theoretical support for the development of the treatment plan.(2) According to the specific adverse geological conditions of Bada railway Li Jia Wan Tunnel, and combined with the existing disposal methods of tunnel adverse geological disasters, the advantages and disadvantages of different measures, develop reasonable comprehensive improvement measures.(3) This paper introduces the concrete construction scheme of Li Jia Wan Tunnel, introduces its construction technology and key technology, and guarantees the construction effect.(4) Through finite element software MIDAS, the model of tunnel support is established, and the change of the stress distribution and displacement field of rock mass is analyzed, and the feasibility of the scheme is verified.