Geomechanics and Engineering

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Measured structural response of a long irregular pit constructed using a top-down method

  • Yang, Sun (College of Harbour, Coastal and Offshore Engineering, Hohai University) ;
  • Yufei, Che (College of Harbour, Coastal and Offshore Engineering, Hohai University) ;
  • Zhenxue, Gu (Shanghai Shen Yuan Geotechnical Engineering Co., Ltd) ;
  • Ruicai, Wang (College of Harbour, Coastal and Offshore Engineering, Hohai University) ;
  • Yawen, Fan (College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications)
  • Received : 2020.05.30
  • Accepted : 2022.11.23
  • Published : 2022.12.10
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Abstract

A 1257-m-long irregular deep foundation pit located in the central of Nanjing, China was constructed using the combined full-width and half-width top-down method. Based on the long-term field monitoring data, this study analyzed the evolution characteristics of the vertical movement of the columns, internal force of the struts, and axial force of the structural beam and slab. The relevance of the three mentioned above and their relationship with the excavation process, structural system, and geological conditions were also investigated. The results showed that the column uplift was within the range of 0.08% to 0.22% of the excavation depth, and the embedded depth ratio of the diaphragm wall and the bottom heave affected significantly on the column uplift. The differential settlement between the column and diaphragm wall remained unchanged after the base slab was cast. The final settlement of the diaphragm wall was twice the column uplift. The internal force of the struts did not varied monotonically but was related to numerous factors such as the excavation depth, number of struts, and environmental conditions. Additionally, the dynamic force and deformation of the columns, beams, and slabs were analyzed to investigate the inherent relationship and variation patterns of the responses of different parts of the structure.

Keywords

Acknowledgement

Sincere gratitude is extended to China Ershisiju Civil Engineering Group Co., Ltd. for the assistance in the field data collection. The research work described herein was funded by the National Natural Science Foundation of China (NSFC, Grant Number: 41672257) and by the Natural science foundation of Jiangsu province (Project Number: BK20160908). Their financial support is gratefully acknowledged.

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