Relationship Between the Normalized Undrained Shear Strength of One-Dimensionally Consolidated or Ko-Consolidated and Isotropically
Description:
Soils in the fi eld are one-dimensionally consolidated or Ko-consolidated. The Ko consolidation line (KoCL) is parallel to the ICL (Figure 11.26). Under Ko consolidation, is the lateral earth pressure coeffi cient at rest for overconsolidated soils. For normally consolidated soils, use
Therefore, the Ko consolidation line is shifted left byIn effect, the
Loading and unloading
a Ko-consolidated fi negrained
soil.
simple CSM is treating a Ko consolidated soil as if it were an overconsolidated soil with respect to isotropic consolidation. For example, the stress point K located on the Ko consolidation line must also be on a URL from the isotropic consolidation line. That is, point K must be on the line OC. From Equation , we obtain, by substitution for pro ,
Substitutingand into Equation , we get
Now Ro has to be calculated based on the preconsolidation stress, prc. From Equation
Dividing both sides of the above equation by p9o, we obtain,
We now insert the following into Equations