Amendment of vacuum preloading technique in the application at Hainan sea flower Island and its improvement mechanism
Chen Xianglong , Jiang Shunwu , Jin Yawei , Deng Yongfeng
DOI:10.11835/j.issn.1674-4764.2017.02.010
Received July 22, 2016,Revised , Accepted , Available online July 04, 2017
Volume ,2017,Pages 75-83
- Abstract
At present, despite that the super soft soil foundation of the dredging silt is mainly strengthened by the vacuum-PVD consolidation method, the clogging is an important issue during the field application. With the vacuum preloading project of the Hengda Sea Flower Island in Hainan Province, a new type of anti-clogging vacuum preloading method for the super soft soil foundation is developed. It is the further improvement of the straight-line vacuum preloading method. The traditional PVD is replaced by the anti-clogging PVD, and the nonporous steel hose and tee sealing joint are also applied to update the traditional connections. Thereafter, the in-situ monitoring during vacuum and quality evaluation after construction is detailed introduced. The results verify the effectiveness and applicability of the preloading vacuum method' amendment. Combined with the existed laboratory model test, the principle of clogging in the vicinity of the PVD during vacuum preloading, and the mechanism of improved vacuum preloading are also discussed.