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In this paper, based on the deep foundation pit support of the reconstruction and expansion project of Jiqing expressway, the FLAC3D 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 key support parameters such as pile diameter and pile distance, pile length, the level of piles under different support schemes is analyzed. The results show that the ideal diameter of bored pile is 0.8-1.2m, the spacing is 1.1-1.3m, the length of pile is 23m-28m. The horizontal displacement of pile body and ground settlement decrease with the increase of length and diameter of support pile. Considering the safety of foundation pit and the reduction of project cost, the pile with length 23m and diameter 0.8m is chosen in the practical engineering.

iop conference series. earth and environmental science

Study on Optimization of Deep Foundation Pit Support Scheme under the Influence of Traffic Dynamic Load in the Reconstruction and Expansion of Jiqing Expressway