Baoji-Lanzhou High-Speed Railway Anding Tunnel Construction Simulation And On-site Monitoring And Analysis

In recent years, with the development of China economic. The people’s demand for convenient transportation is increasing day by day, more and more high-speed railway and passenger dedicated lines began to build. In order to a high speed, people put forward a high requirement to the design and construction and other related technologies. As an important part of the high speed railway and passenger dedicated line, the design and construction of the tunnel face a series of new challenges.Monitoring measurement is an important link in the construction of the tunnel, it has important significance for the design and construction of tunnel. During the construction of high speed railway, high standard and high precision monitoring of the tunnel can help to find the problems in design and construction, so as to ensure the smooth construction of high-speed rail. At the same time, the high-speed railway has raised the requirement of the speed, so that the tunnel construction will face more complicated geological conditions. However, this will increase the difficulty of design and construction. How to make better use of the finite element software to simulate the whole process of the tunnel construction, and how to analyze the feasibility of the design scheme theoretically, it is very important to the construction of the tunnel.This paper will be based on the construction of Baoji to Lanzhou high-speed railway Anding tunnel, and the monitoring data are analyzed, the construction process of the tunnel is simulated by using the finite element software, the main research results are as follows.1) According to the monitoring data of surrounding rock deformation of tunnel,by using the linear regression analysis method, the development trend of the deformation of the surrounding rock of the monitoring section is determined according to the condition of the exponential function. At the same time, it can be predicted that the surrounding rock of the monitoring section will eventually tend to be stable, and the stability of the surrounding rock.2) According to the monitoring data of the tunnel field, we can judge that the initial supporting force is not uniform, and the left side is obviously larger than the right side. Tunnel invert arch bottom stress is larger, both sides is relatively small, and the approximate uniform distribution of force distribution and stress of the concrete is basically consistent with the second lining should be reinforced. Second lining concrete present state of compression, uniform stress, is conducive to the stability of inverted arch.3) By using the finite element analysis software, the construction process of the tunnel is simulated and calculated. According to the calculation results, we suggest that this section IV rock tunnel excavation method should be adopted in three step and seven steps to carry out construction. At the same time, we suggest the tunnel grade IV surrounding rock section of tunnel construction excavation should adopt the following parameters, that is, the excavation footage is 0.6m, the bench length is 3.6m.4) We take the tunnel surrounding rock deformation as the control core, the tunnel surrounding rock deformation of the field data and simulation data were compared and found that their development trend is basically consistent. The field data and simulation data are very close, which shows that the method used in this paper is reliable.