Based on the foundation pit project of the Shisanyong Station of the Nansha-Zhuhai(Zhongshan)Intercity Railway,this paper constructs a finite difference model using FLAC 3D software,incorporating the spatial variability of soil.Combined with the random field theory,it analyzes the effect of foundation pit excavation on the deformation of adjacent pipelines.By introducing random field parameters,the displacement and stress distribution at various measurement points along the edge of the pit and pipelines under different coefficients of variation(COV)are simu-lated.Further,the influence of spatial variability of soil parameters on the deformation of the pit and adjacent pipe-lines is explored.The study shows that the spatial variability of the soil has a significant impact on pipeline deforma-tion during excavation,especially in shallow layers.Increased variability in the random field adds complexity and uncertainty to displacement distribution.When the COV value is large,the range of pipeline settlement increases significantly,showing higher dispersion.Therefore,in practical construction,the spatial variability of soil parame-ters must be fully considered to reduce construction risks and ensure the stability of the foundation pit and the safety of adjacent pipelines.
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