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GEO5

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Analysis for Sands and Silts

For sands and silts the stress exponent j receives the value around 0,5, for the reference stress σr = 100 kPa the resulting settlement equals to the sum of partial settlements of individual layers. It can be derived from the following formula:

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

mi

Janbu modulus in the ith layer

hi

thickness of the ith layer