Chen was a proponent of the floating foundation concept, particularly for lighter structures. The logic is mathematical elegance:
Foundations on Expansive Soils by F.H. Chen is a seminal 1975 geotechnical text focusing on practical engineering solutions for building on swelling clays, including drilled piers and chemical stabilization. While praised for its case studies, the text is noted for prioritizing "swelling pressure" over some modern theoretical concepts. The work is available through retailers like Amazon. Expansive Soil Foundation - Fine Homebuilding
F.H. Chen's seminal work, Foundations on Expansive Soils , is a comprehensive guide for practicing engineers that bridges the gap between theoretical soil mechanics and practical construction solutions for swelling soils. Originally published in 1975 and updated in later editions, the text addresses the significant structural damage caused by soils that swell with moisture and shrink upon drying. The book is structured into two primary parts: Part I: Theory and Practice
This section focuses on the fundamental nature of expansive soils and the methodologies used to mitigate their effects. Transport Research International Documentation - TRID Nature and Identification
: Chen details the origin, mineralogical composition (specifically the role of smectite/montmorillonite), and basic structure of these soils. He provides methods for recognizing expansive potential through mineralogical identification and index testing. Mechanics of Swelling
: The text explores moisture migration, swelling potential, and swelling pressure—the force required to counteract soil expansion. Foundation Design Techniques : Chen discusses various engineered solutions, including: Drilled Pier Foundations
: Isolating the structure from the "active zone" of moisture fluctuation by anchoring piers deep into stable soil. Mat Foundations foundations on expansive soils chen pdf
: Using rigid slabs to distribute loads and minimize differential movement. Soil Treatment
: Techniques such as soil replacement with non-expansive material, pre-wetting, and chemical stabilization using lime. Moisture Control
: Implementing horizontal and vertical moisture barriers and proper drainage to keep the soil's water content constant. Part II: Case Studies
The second half of the book provides practical insights through documented failures and successes. Foundation Engineering for Expansive Soils - RexResearch1
Summary
Key concepts
Site investigation and testing
Prediction of movement
Foundation strategies and mitigation
Design considerations
Typical calculations and design checks
Practical recommendations (concise)
References and further reading (standard sources)
If you want, I can:
Fu Hua Chen’s "Foundations on Expansive Soils" is a foundational text bridging geotechnical theory with practical, field-tested solutions for constructing on swelling clays. The text covers the mechanics of moisture-induced volume changes and provides detailed, case-study-driven design solutions for foundations in active soils. For more details, visit Elsevier Shop.
Foundations on Expansive Soils - 1st Edition | Elsevier Shop
Chen emphasizes that costly mistakes happen when expansive soils are misidentified as ordinary clays. He recommends a dual approach:
Chen also introduced the concept of Potential Volume Change (PVC) based on the soil’s natural moisture content relative to its plastic limit (W–PL). A negative difference indicates moisture deficiency and high swell potential. Chen was a proponent of the floating foundation
