In order to analyse the impact of underground shield construction on the settlement of adjacent buildings.Based on the construction section of a shield structure in Humen Town,Dongguan City,this paper establishes the calculation model of the existing building and shield structure through site monitoring and Flac3D software.The influence of shield excavation on settlement of existing buildings under different conditions is studied. The results show that with the tunnel depth increasing from 15.2 m to 23.2 m,the maximum settlement of the building decreases from 16.41 mm to 11.02 mm.The distance between the middle line of the tunnel and the building is reduced from 14m to 8m,and the maximum settlement of the building is increased from 8.15mm to 20.98mm.It shows that the distance between the buried depth of the tunnel and the building should be ensured to ensure the continued use of the existing building after construction.
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