Abstract
A field test was conducted on vacuum treatment effects of a dredged slurry ground considering three PVD spacing, i.e., 700, 800, and 900 mm. The settlement and the pore water pressure dissipation were measured during the treatment period. As expected, the consolidation rate associated with closer PVD spacing case is higher than that of the larger spacing case. However, it is observed that the final and stable values of the settlement and the pore pressure dissipation of the close spacing case (e.g., 700 mm) are about 17% higher than the case of larger PVD spacing (e.g., 900 mm). The differences imply that enlarging the PVD spacing not only impedes the consolidation rate but also decreases the vacuum pressure in slurry. Numerical models incorporating the vacuum pressure attenuation effect and the clogging effect were established to reproduce the vacuum treatment process under the three PVD spacing. Good comparisons between the numerical and test results can be obtained given a proper account of vacuum attenuation and the clogging effect along the PVD depth. The comparison clarifies that, for vacuum treatment of slurry ground, the PVD spacing should be determined by due considerations both on the desired consolidation rate and on the pore water pressure that needs to be dissipated.
Highlights
With the rapid development of coastal cities, the demand for land continues to increase
Field test was conducted on vacuum treatment effects of a dredged slurry ground considering three prefabricated vertical drains (PVDs) spacings
Comparisons have been made on the settlement and the pore water pressure dissipation to signify the influences of PVD spacing on the treatment effects
Summary
With the rapid development of coastal cities, the demand for land continues to increase. It is concluded that the PVD spacing is only controlled by the desired consolidation rate, which implies that the treatment effect associated with larger PVD spacing will eventually be the same as that of smaller spacing, given the treatment time is long enough. This might not be true for the dredged slurry ground treated by vacuum preloading, due to the inherent clogging phenomenon. E simulated and tested results generally agree, which helps clarifying the influence of PVD spacing on vacuum treatment effects of dredged slurry Three finite element models incorporating different patterns of vacuum attenuation along the PVD were established to reproduce the vacuum preloading processes of the three tested slurry foundations. e simulated and tested results generally agree, which helps clarifying the influence of PVD spacing on vacuum treatment effects of dredged slurry
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.