Analysis on soil displacement and distribution of ground displacement field of shielding tunnel under the BinHai thorough fare of Shenzhen

摘要

It's crucial to predict soil displacement and stress variation accurately in shield construction of Shenzhen reclamation area. Citing shield tunneling on Hou-Ke section under the BinHai thoroughfare of Shenzhen Metro Line 2 as an example, authors forecasted the numerical simulation for the tunnel excavation with the software of FLAC3D, predicted the numerical tunnel exploration and made a research on the relationship between double-lane tunnel deformation as well as the changes of excavation stress field and surface sedimentation influenced by tunnel separation distance, depth, and shield tunneling parameter and other factors. Trough the comprehensive analysis of monitoring data, the authors reached conclusions that all the maximum value of surface accumulative sedimentation occurred near the longitudinal of medial axis, the peripheral stress was redistributed after tunnel excavation and the maximum principal stress concentration area of influence was limited.