Structural Response and Preservation of Historic Buildings Adjacent to Oversized Deep Excavation
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 6
Abstract
A super-large-scale foundation pit ( in plane) adjacent to an existing historic building on three sides was constructed by the technique of a deep foundation pit group in downtown Shanghai, China. Through extensive and long-term field monitoring, this study investigated structural responses of the building during the construction process as well as effectiveness of corresponding protective measures on controlling the deformation of foundation pit and building settlement. The analysis of field data indicated that by taking advantage of the construction technology of the foundation pit group, the wall deflection close to the protection building was controlled within 0.09% final excavation depth, which was less than the limit of relevant specifications. The control effect of prestressed steel support on wall deflection did not surpass that of reinforced concrete supports when the excavation depth was less than 12 m but rose significantly after the excavation entered the soft clay layer. The construction of diaphragm wall panels resulted in significant settlement of the historic building. However, more importantly, the lateral stress relief of soils on both sides of it caused by trenching would lead to hogging deformation of the bearing wall and horizontal tensile stress in the building’s foundation, which aggravated the crack propagation and structural damage. Underpinning for the historic building was verified to be an effective method to resist the impact of ground movement caused by the excavation in soft soils. The maximum settlement of the historic building during the excavation stages stabilized between 10 and 18 mm, accounting for 20%–40% of the total settlement, far less than the settlement of ground surface around the building.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (e.g., further research or numerical model validation).
Acknowledgments
Many organizations and individuals provided assistance and support for this research. Special thanks are given to Mr. Yinghui Tan of Shanghai Construction No. 7 Group Co., Ltd. and Mr. Huaicui Li of Shanghai Construction Group Co., Ltd. for providing detailed information of the site and monitoring, as well as information on Dongjiadu Church. The achievement in this paper is funded by the Shanghai Committee of Science and Technology (Grant Nos. 17DZ1203804 and 19511100802) and National Natural Science Foundation of China (Grant No. 52078383).
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Journal of Performance of Constructed Facilities
Volume 35 • Issue 6 • December 2021
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© 2021 American Society of Civil Engineers.
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Received: Oct 1, 2020
Accepted: Sep 1, 2021
Published online: Oct 5, 2021
Published in print: Dec 1, 2021
Discussion open until: Mar 5, 2022
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