Preloading using fill surcharge and prefabricated vertical drains for an airport |
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Authors: | Jun Wang Ziquan Fang Yuanqiang Cai Jinchun Chai Peng Wang Xueyu Geng |
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Affiliation: | 1. College of Architecture and Civil Engineering, Wenzhou University, Chashan University Town, Wenzhou 325035, China;2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China;3. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, Zhejiang 325035, China;4. Key Laboratory of Engineering and Technology for Soft Foundation and Tideland Reclamation, Wenzhou University, Zhejiang, Wenzhou 325035, China;5. Department of Civil Engineering and Architecture, Saga University, 1 Honjo-machi, Saga-city, Saga 840-8502, Japan;6. School of Engineering, University of Warwick, Coventry, CV4 7AL, United Kingdom |
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Abstract: | This paper presents the field measurements and analysis of a preloading project with the installation of prefabricated vertical drains (PVDs) in Wenzhou, China. At the site, PVDs were installed to a depth of 22?m from the ground surface with a spacing of 1.5?m in a triangular pattern. The preloading fill thickness was 6?m with a unit weight of approximately 18 kN/m3. After a total elapsed time of 310 days, approximately 3?m thick fill was removed. The measured preloading settlement was approximately 1.5?m. The measurements and analytical results indicated that the soil layer with PVD improvement reached almost 100% primary consolidation when part of the fill was removed. After partial unloading, the PVD-improved zone was in an over-consolidated state. After the runway was opened for traffic, a settlement increment of approximately 7?mm was monitored over a period of 11 months. Analysis indicated that the settlement was mainly due to the consolidation of soil layers below the PVD-improved zone and post-surcharge secondary consolidation of the PVD-improved zone. The values of the parameters related to PVD improvement were back-estimated from the field measurements. These findings can be used to guide the design of PVDs improvement along the east coast of China. |
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Keywords: | Geosynthetics Surcharge preloading Ground treatment Runway Consolidation Field monitoring |
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