Geotechnical Engineering · Lesson 26 of 27

Expansive and Collapsible Soils

Why some clays swell when wetted and shrink when dried, how plasticity index and activity grade swell potential, the free swell index test, estimating heave from the swell index with heave = Cs/(1 + e0) H log10(Ps/sigma_f'), collapsible loess and wetting collapse graded by CP = delta-e/(1 + e0), the collapse settlement CP x H, and how lime, moisture control, prewetting, and deep piers mitigate both hazards.

15 min read · Super Ea