Improved Vacuum Preloading Method Combined with Sand Sandwich Structure for Consolidation of Dredged Clay-Slurry Fill and Original Marine Soft Clay
Publication: International Journal of Geomechanics
Volume 21, Issue 10
Abstract
An improved vacuum preloading method combined with a sand sandwich structure (SSS) was developed to facilitate the consolidation of dredged clay-slurry fill and original soft marine clay for land reclamation. In this method, a novel sandwich structure is formed as a sand layer introduced on to original soft marine clay prior to the placement of reclaimed, dredged clay-slurry. This assists in transmitting the vacuum pressure to both the reclaimed, dredged clay-slurry and the original soft marine clay, through prefabricated vertical drains, with little vacuum loss, and the sand layer thereby improving the efficiency of the vacuum preloading. Field pilot tests were carried out on improved ground both with and without using a SSS in order to demonstrate the capacity of the improved vacuum preloading method combined with the SSS. Field measurements were performed to evaluate the ground settlement, degree of vacuum loss, effective consolidation stress, shear strength, and bearing capacity. The test data showed that better consolidation results were achieved using the improved vacuum preloading method combined with the SSS.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51609093).
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Published In
International Journal of Geomechanics
Volume 21 • Issue 10 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 12, 2020
Accepted: Apr 16, 2021
Published online: Jul 29, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 29, 2021
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