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Settlement 

GEO5

Geotechnical software

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Analysis for overconsolidated sands and silts after Janbu

Providing the final stress in soil exceeds the preconsolidation pressure (σor + σz > σp), the settlement of layered subsoil is found from the following equation:

where: σor,i - vertical component of geostatic stress in the middle of ith layer
σp,i - preconsolidation pressure in the 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
mr,i - Janbu modulus of recompression in the ith layer
hi - thickness of the ith layer

If the stress due to surcharge does not cause the final stress to exceed the preconsolidation pressure (σor + σzσp), it is possible to assume the following forms of equations for the computation of settlement of layered sand or silt subsoil:

where: σor,i - vertical component of geostatic stress in the middle of ith layer
σp,i - preconsolidation pressure in the ith layer
σz,i - vertical component of incremental stress (e.g. stress due to structure surcharge) inducing layer compression
mr,i - Janbu modulus of recompression in the ith layer
hi - thickness of the ith layer



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