Effect of water content on lime additive content in vacuum preloading with PVDs

Abstract

Dredged slurry is composed of a great quantity of fine soil particles, which accumulate around prefabricated vertical drains during vacuum preloading. The addition of hydrated lime as a flocculent can improve the permeability and vane shear strength of dredged slurry. A series of experiments showed that lime exists in the lime modification optimum as a flocculent. This study was aimed at analyzing the relationship between a given amount of lime additive and different water contents according to lime flocculation combined with a vacuum preloading test. For this, parameters, including the pore water pressure, discharged water, post-test water content, and vane shear strength, were monitored. Based on a given amount of lime additive in optimum water content, a function was derived, which could provide theoretical guidance for similar studies in the future.

Keywords:

• Dredged slurry
• flocculation
• optimum water content
• hydrated lime
• vacuum preloading

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was supported Programs of Science and Technology of Wenzhou (grant no. S20160001, S20170005, S20180001, and S20180002) and Science and Technology Association of Wenzhou (grant no. 2019KXCX-RH5 and 2019KXCX-RH6). This financial support is gratefully acknowledged.