Characteristics analysis for high-rise buildings during top-down construction
Abstract
New advances in top-down construction are developing with the construction of supertall buildings in China. This study presents a finite element analysis for high-rise structural construction with a top-down method (TDM) considering complex environmental conditions. Based on this analysis model, the forces and the deformation of the diaphragm wall, beams, and soldier piles at various stages of construction are computed. Taking a super high-rise building with a 5-story basement in Nanjing as an example, the reliability and accuracy of the model is verified by comparing the measured and simulated results of displacement and stress values at various locations. The research results reveal the relationship between excavation depth, soil settlement and pile displacement, which is convenient for finding the optimal construction critical surface. It lays a foundation for the study of the critical height of the subsequent construction and facilitates the prediction of the weak link in the process. At present, this project is under construction, so this study has reference value for subsequent construction projects.
Keyword : top-down method, large area deep foundation pit, dual-purpose diaphragm wall, one column with one pile, finite element analysis
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
Han, J., Wang, J., Jia, D., Yan, F., Zhao, Y., Bai, X., Yan, N., Yang, G., & Liu, D. (2023). Construction technologies and mechanical effects of the pipe-jacking crossing anchor-cable group in soft stratum. Frontiers in Earth Science, 10. https://doi.org/10.3389/feart.2022.1019801
Jiangsu Nanjing Geo-Engineering Surveyiec Institute. (2014). The detailed investigation report of geotechnical engineering of Nanjing International Square Phase II (Report No. 2014-GK001). Nanjing International Group Co., LTD (in Chinese).
Li, T., Zhao, W., Liu, R., Han, J., Jia, P., & Chen, C. (2022). Visualized direct shear test of the interface between gravelly sand and concrete pipe. Canadian Geotechnical Journal. https://doi.org/10.1139/cgj-2022-0007
Liu, Y., Li, J.-P., & Chen, W. (2013). Key construction techniques for oversized excavation pits using top-down method. Chinese Journal of Geotechnical Engineering, 35(1), 489–494 (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2010). Technical specification for top-down construction method of underground buildings (JGJ165-2010). China Architecture and Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2011). Code for design of building foundation (GB50007-2011). China Architecture and Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2012). Load code for the design of building structures (GB50009-2012). China Architecture and Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2013). Technical specifications for urban rail transit engineering monitoring (GB50911-2013). China Architecture and Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2016). Code for seismic design of buildings (GB50011-2016). China Architecture and Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2018). Technical standard for top-down method of building engineering (JGJ 432-2018). China Architecture & Building Press (in Chinese).
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China. (2021). Technical specification for construction of top-down method (DG/TJ 08-2113-2021). China Architecture and Building Press (in Chinese).
Tan, Y. (2015). Lessons learned from construction of Shanghai metro stations: importance of quick excavation, prompt propping, timely casting and segmented construction. Journal of Performance of Constructed Facilities, 29(4), Article 04014096. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000599
Tan, Y., & Li, M. (2011). Measured performance of a 26m deep top-down excavation in downtown Shanghai. Canadian Geotechnical Journal, 48(5), 704–719. https://doi.org/10.1139/t10-100
Tan, Y., & Wang, D. (2013a). Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay. I: Bottom-up construction of the central cylindrical shaft. Journal of Geotechnical and Geoenvironmental Engineering, 139(11), 1875–1893. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000929
Tan, Y., & Wang, D. (2013b). Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay. II: Bottom-up construction of the central cylindrical shaft. Journal of Geotechnical and Geoenvironmental Engineering, 139(11), 1894–1910. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000928
Tang, Y., & Zhao, X. (2016). Field testing and analysis during top-down construction of super-tall building in Shanghai. KSCE Journal of Civil Engineering, 20(2), 647–661. https://doi.org/10.1007/s12205-015-1529-z
Wang, Y. G. (2011). Design and case studies for top-down method construction. China Architectural and Building Press (in Chinese).
Wang, Q.-L. (2012). Top-down method technology in high-rise building in the applied research [Doctoral dissertation]. Liaoning Technical University.
Wang, W.-H. (2020). Study on pile-column conversion mechanism of top-down method in super high-rise buildings [Doctoral dissertation]. Southeast University.
Wang, W.-d., Wang, H.-R., & Xu, Z.-H. (2012). Experimental study of parameters of hardening soil model for numerical analysis of excavations of foundation pits. Rock and Soil Mechanics, 33(8), 2283–2290 (in Chinese). https://doi.org/10.3969/j.issn.1000-7598.2012.08.008
Wang, C., Huang, M., Ma, C.-R. (2019). Sensitivity analysis of stratum parameters to soft soil deep foundation pit deformation. Bulletin of Science and Technology, 35(10), 171–175 (in Chinese). https://doi.org/10.13774/j.cnki.kjtb.2019.10.033
Yoo, C., & Lee, D. (2008). Deep excavation-induced ground surface movement characteristics – A numerical investigation. Computers and Geotechnics, 35(2), 231–252. https://doi.org/10.1016/j.compgeo.2007.05.002
Zhao, X. H. (1998). Theory of design of piled raft & piled box foundations for tall buildings in Shanghai. Tongji University Press (in Chinese).