Stratum Deformation Caused By Excavation And Control Standards Analysis Of Large Cross-section Subway Tunnel

The problem of environment caused by city tunnel project is one of the hot issues in underground engineering at recent year, the buildings on the surface distribute intensive and the form of structure diversification cause the surrounding environment of the structure project complex, ground movement and building deformation controls strictly is the common characteristics in city tunnel project. Based on the subway tunnel engineering from metro tunnel of Shenzhen subway line2,this paper summarizes the ground movement and building deformation caused by large cross-section tunnel excavation from the way of site monitoring, Numerical simulation and settlement control standard.The main research contents:(1)Through the monitoring measurement of2201section in Shenzhen metro line2, analyzed building deformation, ground movement and ground loss caused by tunnel excavation in different rock condition and different section, summarized the regularity and connection between Different affecting factors of tunnel excavation in2201section.(2)For the regularity of ground movement and building deformation caused by large cross-section tunnel excavation, using finite element method to build numerical model to analysis the ground movement and building deformation caused by rock reinforcement or without reinforcement, double sidewall heading excavation method or CRD method.(3) Based on the domestic and foreign research, analyzed the main influence factors of ground and adjacent building deformation control standard, discussed the ground and adjacent building deformation influenced by tunnel excavation, and made corresponding standards based on the different characteristic of the ground an adjacent building. Exploited urban metro construction monitoring system, this system operation simply, with the characteristic of quick, convenient and practicalThe practice achievements and experience of the engineering may provide preference for the similar engineering or similar projects, have Experience and promoting significance to the ground movement and building deformation caused by large cross-section tunnel excavation in city.