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Metro construction has important significance to the safety of the structure, based on a line existing Beijing subway, with air shaft and station structure as the background, research on soil displacement near the existing structure. The results show that: (1)The shield to the main structure from about 28.8m-7.2m (except for the shield at the center line testing point), the displacement and the shield is the same direction, the displacement changes generally decrease from the surface to the deep level, the variation is in the range of 1-5mm, with a linear distribution; (2) The displacement direction is as same as shield direction from 7.2m-3.6m, the displacement increases continuously is in the range of 5-15mm, the displacement accord with normal distribution; (3) 1 times diameter range and the shield to the existing structure of 7.2m-3.6m range should be regarded as significant influence area in the process of shield construction. The displacement of soil increases with the approach of shield, the maximum displacement point appears at the center of shield or above the top of shield of 1m. The above results can provide reference for shield driving parameters.

Influence of Shield Propulsion on Longitudinal Soil Mass Near Subway Structure