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Study on Influence of Unloading of Vacuum on Stability of Embankment Improved by Vacuum Combined with Preloading

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Abstract:

In order to study influence of unloading of vacuum on stability of embankment whose soft ground is improved by vacuum combined with preloading, the change of effective stress of soft clay in the improved area is analyzed when vacuum is unloaded and the undrained shear strength of soft clay in the improved area after unloading of vacuum is deduced. Changes of undrained shear strength of soil and stability of embankment owing to unloading of surcharge are also analyzed for comparison. It is shown by theoretical analysis, laboratory tests and a project that the undrained shear strength of soft clay improved by vacuum combined preloading is decreased after unloading of vacuum and the stability of embankment after unloading of vacuum should be taken into account for design. Safety factor of stability of embankment increases after unloading of surcharge since decrease ratio of load of embankment is more than decrease ratio of undrained shear strength of clay.

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Periodical:

Applied Mechanics and Materials (Volumes 178-181)

Pages:

1688-1693

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.178-181.1688

Citation:

Cite this paper

Online since:

May 2012

Authors:

Ji Fu Liu, Guan Feng An, Gang Zheng

Keywords:

Stability of Embankment, Undrained Shear Strength, Unloading of Vacuum

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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