Numerical Study on the Behavior of an Existing Tunnel during Excavating Adjacent Deep Foundation Pit

Jianwei Liu, Bingshuang Xue, Haibo Wang, Xuemin Zhang and Yongxing Zhang ()
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Jianwei Liu: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Bingshuang Xue: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Haibo Wang: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Xuemin Zhang: School of Civil Engineering, Central South University, Changsha 410075, China
Yongxing Zhang: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

Sustainability, 2023, vol. 15, issue 12, 1-12

Abstract: The excavation of a deep foundation pit adjacent to an existing tunnel may lead to the large deformation and induce damages in the tunnel structure. However, the influence on existing tunnel structure from nearby excavations has not been understood clearly, since it is affected by complex influencing factors of not only the geological and topographical conditions but also the construction method and positional relationship of the adjacent structures. This paper presents a numerical investigation into an existing underground rail transit line during the excavation of an adjacent deep foundation pit, in which the behavior of the existing tunnel structure from excavating the aforementioned foundation pit is clarified, and the effectiveness of the adopted three-dimensional model is confirmed by comparison between the numerically calculated and field-measured ground settlement of the monitoring point. The results demonstrate that the deformation of the existing tunnel structure is mostly induced by the excavation of the deep foundation pit. This study can provide a reference of deep excavations adjacent to existing infrastructures.

Keywords: behavior influence; structure safety; adjacent existing tunnel; foundation pit excavation; numerical investigation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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