Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (5): 1441-1451.doi: 10.13278/j.cnki.jjuese.20200246

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Study on Deformation Characteristics of Ventilation Shaft Section in Foundation Pit Excavation Adjacent to Railway

Li Liyun, Wang Ziying, Wang Xiaojing, Du Xiuli   

  1. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
  • Received:2020-11-03 Online:2021-09-26 Published:2021-09-29
  • Supported by:
    Supported by the Science and Technology Planning Project of Beijing (Z181100009018001) and the Science and Technology Fund of Beijing University of Technology to Graduate (ykj-2018-00601)

Abstract: In this paper, for a deep foundation pit of an underground station in Changchun, the instability crisis and its mechanism in the ventilation shaft section during the excavation of the foundation pit are studied in depth. Through the analysis of the horizontal displacement of the pile body, the horizontal displacement of the pile top, the support axial force of the bracing, and the settlement difference of the shoulders on both sides of the railway track, the major causes of the excessive deformation of the foundation pit in the ventilation shaft section are discussed. Then, the construction process of the foundation pit is simulated using ABAQUS finite element software, and the instability mechanism of the foundation pit in the ventilation shaft section is analyzed. The results demonstrate that the excessive deformation of the foundation pit in the ventilation shaft section is caused by the coupling of the excessive stress release of strata and the spatial effect of the foundation pit deformation. The spatial effect of the foundation pit deformation in the ventilation shaft section is remarkable due to the existence of positive corner in the ventilation shaft and the absence of diagonal bracing during construction, and the pit wall produces torsional deformation pointing to the inside of the ventilation shaft. The excessive excavation and unsuitable support installation lead to the excessive stress release in strata, which causes the excessive deformation of retaining piles and deteriorates the stability of the foundation pit.

Key words: foundation pit, deformation characteristics, construction process, numerical simulation

CLC Number: 

  • TU43
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