Numerical Analysis of the Influence of Deep Foundation Pit Excavation on Adjacent Underground Pipelines
[Objective]In order to study the displacement variation law of adjacent underground pipelines during the excavation of deep foundation pits.[Method]Based on a deep foundation pit project of Nanchang No.4 line,FLAC 3D software is used to simulate the whole process of dynamic construction of foundation pit,and the in-fluence of different pipe materials,pipe diameter,buried depth and buried distance of internal support on pipe-line displacement is analyzed.And the field deformation monitoring data are used for comparison and verifica-tion.[Result]The results show that the internal support plays a good role in limiting the displacement of the ad-jacent pipeline during the construction of the foundation pit.In the process of foundation pit excavation,the change of pipe material and pipe diameter mainly affects the settlement of pipeline.[Conclusion]The stiffness of different types of pipes is different.The greater the stiffness,the stronger the pipeline's ability to resist soil de-formation.The settlement variation of the pipeline is negatively correlated with the variation of the pipe diame-ter.The buried depth of the pipeline has a significant effect on the horizontal displacement of the pipeline.The horizontal displacement of the pipeline increases first and then decreases with the increase of the buried depth,and reaches the maximum when the buried depth of the pipeline is close to 1/2 of the design depth of the founda-tion pit.Under the principle of following a single variable,there are differences in the influence range of dis-placement of pipelines with different buried distances.Compared with pipeline settlement,foundation pit excava-tion has a greater influence range on the horizontal displacement of adjacent pipelines.
deep foundation pitburied pipelineinternal supportnumerical simulationpipeline displacement
万方数据
维普
