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GEO5

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Analysis Using the Soft Soil Model

The analysis employs the modified compression index λ and is based on the Soft soil elastic-plastic model developed in university of Cambridge. The soil deformation assumes the volumetric strain to be linearly dependent on the change of effective mean stress ε plotted in natural logarithmic scale. The settlement of the ith layer is then provided by:

where:

σor,i

-

vertical component of geostatic stress in the middle of ith layer

σz,i

-

vertical component of incremental stress (e.g. stress due to structure surcharge) inducing layer compression

hi

-

thickness of the ith layer

λ

-

modified compression index in the ith layer

The analysis requires inputting the modified compression index λ usually obtained from triaxial laboratory measurements.

If the modified compression index λ is not known, it is possible to specify the compression index CC together with an average value of the void ratio e (if that is also not know it is sufficient to provide the initial void ratio eo) and the program then performs an approximate computation of the modified compression index λ using the available information.

Literature:

Burland J.B. The yielding and dilatation of clay (correspondence), Géotechnique, 15 (2),1965, str. 211-214.