Settlement Analysis of Ground Surface and Adjacent Building Caused by Driving and Expansion Excavation of Shield Tunnel Using Artificial Freezing Method

The artificial freezing method can effectively improve the stability of strata and provide favorable conditions for construction safety shield tunnel in water-rich strata. Based on frozen tunneling project a metro station, which is close to important buildings, reasonable parameters are proposed this paper. simulation model was established by using Plaxis 3D finite element software (Version 2017). numerical verified based large amount field data. characteristics segment deformation, ground surface settlement vertical displacement buildings were compared between layer nonfrozen during excavation. It found that deformation three times layer. above less than 2 mm. Expansion excavation carried out meet space function subway station method. full section partial former 4.5 latter, so chosen as main research object. Subsequently, under studied. away from greater near All values requirements, thus ensuring feasibility construction.