Assessment of the Impact of Subway Tunnel under the Two Open-excavated Tunnel after Foundation Pit Excavation
CHEN Zhiping
LIN Benhai
Abstract：Foundation pit excavation will cause surrounding rock stress redistribution of the tunnel construction under the metro line, which could change deformation and internal force of the tunnel construction, thus affecting the normal operation of the subway tunnel. Therefore, a rational construction scheme and adequate protection of foundation pit excavation is of great significance as well as the tunnel protection. Taking a project in Guangzhou as an example in this paper, the model simulated the practical construction process and then also dynamic analysis on the affection of two open-excavated tunnels excavating successively on the tunnel construction under the metro line 5 by using large finite element software Midas-GTS. The results show that additive effect caused by the two open-excavated tunnels excavating successively will influence the force and deformation of the tunnel construction under the metro line 5, but its varieties of stress are very small, not enough to affect the structural safety of subway tunnel. The result provides valuable reference for design and construction. It is helpful to other similar projects.
Keywords：Finite elementSuperimposed effectSafetyConstruction process
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 63-68 )