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http://dx.doi.org/10.12989/gae.2022.31.5.489

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)
Publication Information
Geomechanics and Engineering / v.31, no.5, 2022 , pp. 489-503 More about this Journal
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
field monitoring; internal force variation; internal structure; irregular foundation pit; top-down method;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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