Mechanical Properties of Sheet Pile Cofferdam during Adjacent Open Cut Tunnel Construction near Lake Bottom

In water-related projects, the application of steel sheet pile cofferdams is becoming more and widespread, influence tunnel construction on mechanical properties adjacent important. this study, object research was large-span cofferdams. The open-cut project located in Suzhou Yinshan Lake, China. According to actual steps foundation pit, assuming that soil a small strain hardening model, combined with on-site monitoring data, three-dimensional elastoplastic finite difference model established. results show during construction, maximum settlement cofferdam appeared at 0.27~0.53 m side pit; horizontal displacement occurred bottom pit side, seepage gradually increased eventually resulting water gushing pit. After completion value presented pattern first then decreased from lakeside; tilted toward inclination angle 3.37°. It should be pointed out as progressed, axial force tie rods changed U-shaped distribution V-shaped distribution. This study could provide reference for impact also safety construction.