| With the expansion of city size, urban traffic congestion become one of the major problems faced in major cities. As an important part of traffic, the underground railway project, with big traffic, low pollution, does not affect to the ground transportation, etc., is accepted by the city decision-makers of all ages. Super section multi-arch tunnel of Harbin Subway, between Hananzhan station and Nongkeyuan station, are large shallow soil tunnel with double-wall + construction tunnel construction method. On this background, this paper does research on the conduct monitoring and numerical simulation of wall rock with various stages.Firstly, this paper studies the deformation of two-dimensional finite element analysis process by the use of ANSYS11.0 software with Durcker-Prager yield criterion. This paper studies the deformation of double wall and in the heading construction method at different stages and concludes the stability and stress state of the support structure and wall rock during construction. Study found that the left and right tunnel and the heading construction process in four-arch tunnel had about 80% of the displacement; the tunnel vault and the arch part of it is stress concentration surrounding area, most likely in this damage occurred; the left and right tunnel and the pilot tunnel of four-arch tunnel vault tensile stressσ1 phenomenon occurs, but as the calculation progresses, the tensile stress gradually disappear, the stress state improve.Secondly, the implementation of XK1 +450 Monitoring Section, and the results analyzed. By surface subsidence, vault settlement and convergence monitoring data analysis and judgments, found that rock deformation occurred mainly from the tunnel face one time of the tunnel diameter, in the range of one to three times the tunnel diameter change rate decreases, three times the Diameter later stabilized.Finally, compared with the finite element analysis results and monitoring data, the four-arch tunnel deformation law is summarized. |
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