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Settlement
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 + 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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