Stress Analysis And Construction Scheme Optimization Of Surrounding Rock Of 1 # Bias Twin - Arch Tunnel In

Across the world, China is one of several countries in the rapid development of infrastructure, highway construction is the pillar industry of economic prosperity. As a mountainous country, the highway network construction in arch tunnel is a more common form of tunnel structure. Complex terrain, geological conditions, route selection, construction sequence and construction methods in the construction process is the reason arch tunnel bias. Therefore, under the condition of the terrain, the position of the tunnel can not be changed, the terrain deviation is certain, even the arch tunnel has more complex structure, and the stress of the tunnel has a great influence on the construction process. The following conclusions:first on the shallow buried tunnel construction, at the same time, around the constraints of the tunnel control distance between 2.5-3.0 times hole diameter is more reasonable.In this paper, the engineering background of the large Zhongshan No.1 unsymmetrical pressure multi arch tunnel on the stone red highway, selects outlet section of No.1 tunnel as the research object, using nine different construction sequence and different left and right tunnel space, through mutual combination, the establishment of bias arch tunnel of 3D digital model. Under different conditions simulated stress and displacement changes, pressure and displacement, the two lining construction process and strength. Conclusion:at the same time, it is reasonable to control the diameter of 2.5-3.0 times of the diameter of the tunnel.Combined with the simulation analysis, further analyzes the stairs and the spacing of 6 meters,12 meters,18 meters,24 meters in four different construction situation, changes and middle wall stress and displacement of surrounding rock stress and displacement. Conclusion:in the process of tunnel construction, up and down the steps of distance control in 0.5 times of hole diameter is more conducive to the construction.Based on large zhongshan No.1 tunnel on the analysis of the monitoring data, research bias multi-arch tunnel surrounding rock in the process of construction, the deformation of the lining stress corresponding change. According to the result of numerical simulation. The results show that the three-dimensional numerical simulation analysis result has higher reliability. At the same time, according to the first excavation main hole, the variation of the secondary lining crack analysis in tunnel work in a stable state in the whole.