Analysis of the consolidation effect of ultra-soft ground via vacuum preloading

B. Xu, T. Noda, S. Yamada

Research output: Chapter in Book/Report/Conference proceedingChapter


A soil-water coupled finite element analysis incorporating the macro-element method is carried out to investigate the consolidation effect of ultra-soft soils using the vacuum preloading method. SYS Cam-clay model is employed as the constitutive model. Taking the one-dimensional compression tests and in-situ vane shear tests into consideration, the soil parameters and initial values can be determined correspondingly. The calculation results show that there is a good accordance between the observational and numerical settlements, and the degree of consolidation after 90 days’ application of the vacuum pressure is around 61% by predicting the long-term settlement. By reproducing the unconfined compression tests numerically, the undrained shear strength can be determined using the state variables. The variation of undrained shear strength at a depth of 1 meter at different stages of the vacuum preloading shows that the strength of ultra-soft soils increases gradually, which is also very close to the in-situ vane strength.

Original languageEnglish
Title of host publicationCivil Engineering and Urban Planning III
PublisherCRC Press
Number of pages5
ISBN (Electronic)9781315743004
ISBN (Print)9781138001251
Publication statusPublished - 2014 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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