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Analysis for Overconsolidated Sands and Silts

Providing the final stress in the soil exceeds the pre-consolidation 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

-

pre-consolidation 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 pre-consolidation pressure (σor+ σz ≤ σp), 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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