Abstract:Through the example of the tunnel project crossing Shaohai Lake in the Shaohai Xiyuan Road Area Underground Road Project, the overall layout of the tunnel project crossing the lake is introduced. The double-row steel sheet pile cofferdam excavation construction is adopted. The project is constructed in two stages. After backfilling the soil inside the cofferdam, it serves as the construction site, and then the tunnel foundation pit is excavated. In the first stage, the tunnel roof is constructed first with a reserved water retaining wall, which is connected to the cofferdam in the second stage. At the same time, the deformation data of measuring points on a monitoring section of the main structure of the project completed is selected to analyze the deformation characteristics of the temporary cofferdam, and the change characteristics of the bored pile + internal support system buried in the deep foundation pit engineering are analyzed. The results obtained can be used as a reference for the design and construction of similar foundation pits.
