Dynamic Deformation Control of Retaining Structures of a Deep Excavation
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 4
Abstract
Many uncertain factors in the excavation process may lead to excessive deformations and internal forces of retaining structures; therefore, the design of deep excavations should be adjusted according to real-time monitoring data. This paper presents a case study of dynamic control of excavation deformations. The preliminary design adopted bored piles as retaining structures braced by three levels of steel-reinforced concrete struts, while the final design used only two levels of struts to reduce the construction duration. The final design reduced the safety degree of the project to a certain extent and brought the excavation to a state of emergency. Fortunately, the designers adjusted the excavation sequence based on feedback information from the field monitoring data. In addition, a variety of deformation control measures, aimed at reducing the horizontal displacement of the retaining walls, were used, such as strengthening the chamfer of the retaining structures, adjusting the excavation sequences, and strengthening support nodes. The monitored excavation performance demonstrated that these remedial measures were feasible and effective for controlling excavation-induced deformations and minimizing the relevant risks.
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Acknowledgments
Many people and organizations have contributed to the success of this project. Financial support from the National Natural Science Foundation of China (NSFC Grant No. 51278449, NSFC Grant No. 51238009, and NSFC Grant No. 51338009) and 2014 Jiangxi Province Achievement Transformation Program (Grant No. KJLD14036) are gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 4 • August 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 27, 2015
Accepted: Jun 24, 2015
Published online: Aug 4, 2015
Discussion open until: Jan 4, 2016
Published in print: Aug 1, 2016
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