(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. Research Institute of New Material and Intelligent Equipment，Shandong University(Qihe County)，Dezhou，
Shandong 251100，China)
Abstract：To reveal the deformation characteristics of soil in the shield tunnels excavation section adjacent piles and establish the convergence model of tunnel excavation section. Model test of shield tunnel excavation adjacent to piles was carried out in this paper. Based on the collected data by the developed monitoring device of tunnel section soil displacement，the soil deformation law of excavation section under different conditions was analyzed，and the loss contour of tunnel section with non-uniform convergence mode is proposed A mapping function expression for the Laurent series of tunnel excavation loss section was established based on the theory of complex functions. The results indicated that the tunnel arch bottom lagged behind that of tunnel vault，and the deformation of the soil around the tunnel section was restrained by the adjacent piles. Comparisons between the calculated values and the measured values were made to check the rationality of the mapping function expression of tunnel excavation loss section.
