Abstract: With the continuous development of urbanization in China, the surrounding service environment of water supply pipelines in some cities has undergone significant changes compared to the initial design, mainly including new loads such as new buildings and roads, and weakened lateral constraints near construction sites. Therefore, this article presents the case history of a large diameter water supply pipeline project in Jiangsu. The ABAQUS software is used to conduct a numerical simulation investigation on the stress deformation of pipelines under the influence of pile loading and deep excavation. The changes in pipeline stress, horizontal displacement, and vertical displacement under different on-site conditions are investigated. The numerical analysis results are compared with the current specifications to determine the safety range. The simulation results show that when the embedment depth of a pipeline is at the depth equivalent to the pipe diameter, and the surface load is 150 kPa, the pipeline stress exceeds the safety value required by the specification. When soil is excavated to 10m, the maximum vertical deformation value of the pipeline is 3.75 mm, which meets the allowable deformation value of 5mm in the specification.

Key words: Surcharge Effect, Pipeline Safety; , Numerical Simulation, Safety Evaluation