Taking the new underground box culvert underpassing the special bridge of Guangzhou-Qingdao Intercity Trans-Guangdong-Qingdao Expressway in the flooding remediation project around Guangzhou Vehicle Factory as an example, the impact of the underground box culvert proximity and underpassing construction process on the proximity pier of the special bridge at Huaian Station was studied. Firstly, the settlement values and lateral and longitudinal horizontal displacement values of the underpass pier at different construction stages were obtained by on-site monitoring. Subsequently, a numerical simulation model was established by PLAXIS 3D to further analyze the dynamic response law of the pier. Finally, the construction control standards and control measures for underground box culvert underpassing high speed railway bridges are proposed through parametric analysis of the excavation proximity and excavation depth of the underground box culvert. The research results show that during the construction of new underground box culvert underpass, the settlement and displacement conditions of the pier of Guangqing Intercity Bridge across Guangqing Expressway are within the specification limits, and in order to ensure the absolute safety and smoothness of train operation, it is suggested that the excavation depth of new underground box culvert underpass should be kept within 6 m, and the excavation proximity should be kept above 5 m when it exceeds 6 m.

Ye Dan. Research on the impact of underground box culvert underpass construction on the pier of intercity railroad bridge. Academic Journal of Architecture and Geotechnical Engineering (2024) Vol. 6, Issue 1: 66-73. https://doi.org/10.25236/AJAGE.2024.060110.

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