Part 3 Behavior of Overconsolidated Clay. Normal versus Overconsolidated clay behavior Clay retains a “memory” of its load history The effective cohesion.

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Part 3 Behavior of Overconsolidated Clay

Normal versus Overconsolidated clay behavior Clay retains a “memory” of its load history The effective cohesion of overconsolidated clay can be significant The effective cohesion can be lost through subsequent wetting, especially, load cycling with moisture

Mohr Circle plot of a typical overconsolidated clay soil, illustrating the artificially high cohesion engendered by tortuous desiccation. Note the apparent preconsolidation pressure caused by the severe shrinkage.

The fundamental problem with slabs-on-grade on expansive soils is differential swell beneath the corners, sides, and under the center of a uniformly-loaded slab, as sketched here.