The definitive text for this subject is " Foundations on Expansive Soils
Foundations on Expansive Soils - 1st Edition | Elsevier Shop
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| Soil Expansion Potential | Recommended Foundation | |--------------------------|------------------------| | Low (PI < 15) | Standard strip footing with polyethylene vapor barrier | | Moderate (PI 15–35) | Reinforced stiffened slab with deep edge beams | | High (PI > 35) | Drilled piers (belled or straight) + grade beam, or post-tensioned slab on engineered fill |
Chen’s formulas were empirical. Now, engineers simulate coupled hydro-mechanical behavior—water flow into a clay slope and resulting heave—in 3D. The definitive text for this subject is "
Chen highlights that volume changes are primarily driven by moisture fluctuations in the "active zone" (often 1 to 20 meters deep). The presence of minerals like montmorillonite significantly increases this swelling potential. Identification and Classification:
Proper Drainage: Ensuring water flows away from the foundation to prevent localized "hot spots" of expansion. Finite Element Modeling (Plaxis
This is the core of the PDF. Chen covers:
Fu Hua Chen's "Foundations on Expansive Soils" (1975, revised 1988) is recognized as a practical, "state-of-the-art" text for managing expansive clay soils, often praised for its "plain-talk" approach to field engineering. While criticized by some academics for neglecting certain theoretical frameworks, the book remains a key reference for its focus on swelling pressure, soil stabilization, and comprehensive case studies. Further details can be found on Google Books. Foundations on expansive soils by F.H. Chen - Goodreads