Abstract
In this paper, based on the deep foundation pit support of the reconstruction and expansion project of Jiqing expressway, numerical software is used to establish the numerical calculation model of the deformation support of deep foundation pit under the influence of traffic dynamic load. The numerical calculation results are consistent with the actual project monitoring results. By changing the support parameters such as pile diameter, pile length, vertical support distance in different support schemes is analyzed. The results show that the ideal diameter of bored pile is 0.8-1.2m, the length of pile is 23m-28m. With the vertical support distance increasing, the change trend of horizontal displacement of piles gradually increases. Considering the safety of foundation pit and the reduction of project cost, the pile with length 23m, diameter 0.8m and the vertical support distance 5m is chosen in the practical engineering.
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