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GEO5

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Analysis for Overconsolidated Cohesive Soils

Most cohesive soils in the original order except very young or organic clays are overconsolidated. If the final stress in the soil exceeds overconsolidation stress (σor+ σz > σp) than the settlement of the layered subsoil composites from cohesive soils is computed from following relation:

for: σor+ σz > σp

for: σor+ σz ≤ σp

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