Performance of the Underpinning Piles for Basement-Supplementing Retrofit of a Constructed Building
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 4
Abstract
Development of underground space in urban areas may be obstructed by the aboveground facilities that are in good condition. Instead of building new aboveground structures, an alternative solution is to add new basements under the existing structures. One of the key issues arising from this complicated technique is the behavior of the underpinning piles. This paper considers this issue in terms of a real case recently addressed in China. The retrofit construction procedure was carefully monitored. Observations included the axial-loading and excavation-unloading responses of the underpinning piles, the axial forces transmitted from the piles to the replacing pillars, and the variations in building settlement. The results indicated that the piles acted well as an underpinning role in transferring structure load into surrounding geomaterials. The mobilization degree of the pile-shaft friction increased as the shallow strata were excavated further. Abrupt increase in pillar force and building settlement were detected when the exposed portions of the piles were cut, and therefore the cutting operation should be careful for safety control. The performance-based analyses support the pile-pillar load transmission method and offer a fairly successful reference to future applications.
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Acknowledgments
The authors would like to acknowledge the financial supports from the National Natural Science Foundation of China (No. 41472284) and the Grant for Commonwealth Orientated Technologies of Zhejiang Province (No. 2015C31006). Thanks also are given to Professor Shi-min Zhang at Zhejiang University City College, China, for his technical support in test arrangements.
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Information & Authors
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Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 20, 2016
Accepted: Nov 7, 2016
Published ahead of print: Feb 14, 2017
Published online: Feb 15, 2017
Discussion open until: Jul 15, 2017
Published in print: Aug 1, 2017
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