Effects of the excavation of deep foundation pits on an adjacent double-curved arch bridge

Abstract

The excavation of deep foundation pits can cause variations in the displacement and stress fields of surrounding soils, which hence induces adverse effects on adjacent structures. This study presents a two-stage method to quantify the impact of the excavation of a deep foundation pit on the adjacent double-curved arch bridge in the historical city of Nanjing, Southeastern China. The entire process of the foundation pit excavation was simulated and the induced deformation of the arch foot was obtained in the first stage by hardening soil model with small-strain stiffness. Then, the obtained deformation of the arch foot was applied to the bridge structure as a displacement boundary in the second stage to calculate the internal forces and deformations of the double-curved arch bridge structure. The tensile strength of concrete is taken as the limit value of the tensile stress of the double-curved arch bridge. The limit values of arch foot displacement under four evaluation conditions are obtained by step loading calculation. The present results provide construction guidance and safety warning for the process of foundation pit excavation adjacent to double-curved arch bridges for historical preservation.

Keywords

Deep foundation pit / Two-stage method / Double-curved arch bridge / Safety evaluation

Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

CRediT authorship contribution statement

Xin Yan: Writing - original draft, Software, Investigation, Data curation. Liyuan Tong: Supervision, Resources, Project administration, Funding acquisition, Conceptualization. Hongjiang Li: Writing - review & editing, Supervision, Methodology, Conceptualization. Wenyuan Liu: Software, Methodology. Yu Xiao: Software, Methodology. Wei Wang: Investigation, Funding acquisition.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgement

The majority of the work presented in this paper was funded by the National Natural Science Foundation of China (Grant Nos. 52308341 and 52178384). These financial supports are gratefully acknowledged.

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