: Expanding the bottom of the pier creates a mechanical anchor against upward uplifting forces.
First published in 1975 as Volume 12 of Elsevier's Developments in Geotechnical Engineering series, Chen's book was groundbreaking in its approach. While much of the academic research focused on complex theoretical models, Chen’s work was written "for the practicing engineer." It provided a clear summary of the state-of-the-art knowledge but, more importantly, offered based on a career of solving real-world problems.
| Foundation Type | Design Considerations | | --- | --- | | Deep Foundations | Pile depth, diameter, and material; soil-pile interaction | | Shallow Foundations | Footing depth, width, and material; soil-footing interaction; reinforcement | | Special Designs | Thick slab; reinforced soil layer; soil improvement techniques |
Expansive soils typically contain high percentages of swelling clay minerals, most notably montmorillonite. The molecular structure of these minerals allows water molecules to enter between the clay plates, causing substantial volume expansion. The Mechanics of Shrink-Swell Behavior foundations on expansive soils chen pdf
The most reliable and legal way to access the book is through an institutional or personal purchase. The book is published by Elsevier and is widely available from academic and commercial sources. The PDF version is a commercial product.
High-density polyethylene (HDPE) geomembranes placed 2–3 feet below grade can isolate the foundation from moisture changes. Chen’s era used clay caps; we now use engineered liners.
First, let's talk about the man behind the book. Fu Hua Chen's life was as fascinating as the soils he studied. Here is a quick look at his journey: : Expanding the bottom of the pier creates
Expansive soils, colloquially known as "shrink-swell" soils, contain heavy concentrations of active clay minerals. (PDF) Swelling Potential of compacted expansive soils
: Soils with a PI greater than 25 generally indicate high to very high expansion potential.
The Chen method involves the following key equations: | Foundation Type | Design Considerations | |
where: D = foundation depth γ = soil density e0 = initial void ratio
Fu Hua Chen's is a seminal text in geotechnical engineering, providing a comprehensive guide on the theory and practical solutions for building on soil that expands and contracts with moisture changes. Expansive soils, which contain minerals like montmorillonite , cause billions of dollars in structural damage annually by exerting uplift pressure that can tilt or crack foundations. Core Principles of Chen’s Approach
Expansive soils, also known as swelling soils, are soils that exhibit significant volume changes in response to changes in moisture content. These soils can cause significant damage to structures built on them, particularly foundations. In this post, we will review the Chen method for designing foundations on expansive soils, as presented in Chen (1988).