The displacement of the surrounding soil and the deformation of the supporting structure during excavation in a silty soil layer are discussed.In this paper,taking a foundation pit project of a silty soil layer in Fuzhou City as a case study,according to the general situation of the project,the design of a micro-pile support structure of the foundation pit of the silty soil layer is carried out.Monitoring work was conducted to analyze the horizontal displacement of the occlusal pile and the variation in axial forces of supporting structures with time.A numerical simulation was also used for verification.The results show that the horizontal displacement of occlusal piles increases first and then decreases with the increase of excavation depth,while prolonged excavation tends to cause additional displacement of the pile side soil.Negative values indicate pressure,with the increase of excavation time,the pressure on each supporting structure gradually increases,and the third steel support structure experiences the highest pressure.The horizontal displacement of occlusal piles,the axial forces of supporting structures and the surrounding surface settlement in the numerical simulation and field monitoring stages are consistent.
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