Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 31, Number 5, December10 2022 , pages 489-503 DOI: https://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, Yufei Che, Zhenxue Gu, Ruicai Wang and Yawen Fan
|
||
| 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. | ||
| Key Words | ||
| field monitoring; internal force variation; internal structure; irregular foundation pit; top-down method | ||
| Address | ||
| Yang Sun, Yufei Che and Ruicai Wang: College of Harbour, Coastal and Offshore Engineering, Hohai University, No. 1 Xikang Road, Nanjing, Jiangsu, P.R. China Zhenxue Gu: Shanghai Shen Yuan Geotechnical Engineering Co., Ltd, No. 1368 Tibet South Road, Shanghai, P.R. China Yawen Fan: College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, No. 66 New Model Road, Nanjing, Jiangsu, P.R. China | ||