English：

Taking a deep foundation excavation project in Guangzhou as research background, this paperanalyzes the three⁃dimensional dynamic conditions during excavation of the deep foundation excavation,backfilling of the foundation excavation, and backfilling of the site to the design elevation through datasimulation. It examines the deformation development process of the shallow subway interval tunnel duringconstruction and backfilling to the design elevation, determines the maximum deformation increment ofthe subway interval tunnel in implementation process, and thereby this paper analyzes the adverse effectsof deep foundation excavation and soil backfilling on the deformation of the subway interval tunnel below,and assesses the safety status of the subway interval tunnel. The aim is to provide substantive suggestionsfor the rationality of foundation excavation support design and optimization of construction schemes.