(1. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310027，China；2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：Derived from Mindlin solution，the deformation formula induced by torque between cutterhead and soil is obtained by integration and coordinate transformation，which leads to the total deformation formula induced by shield tunneling. The deformation characteristics and complicated interactions between shield and soil are analyzed based on the Line No.1 of Hangzhou Metro with sandy silt. It is shown that the friction force and bulkhead thrust are the main factors of shield thrust setting，while the friction between the cutterhead and soil is the main factors of cutterhead torque setting. Friction force between shield and soil would make front soil of shield upheave，and subsidence of surface soil is induced by ground loss when the friction force between the cutterhead and soil results in the surface settlement asymmetrical distribution. Compared with the field measurements，the formula is suitable for the distance within the shield cutterhead(±2L)，which can help guiding actual tunnel construction.
