Preface of Foundation Engineering for Expansive Soils book:
The practice of foundation engineering was first developed to address problems associated with settlement due to saturated soils that were prevalent in areas with soft coastal and deltaic deposits.
As population and business centers moved into areas with more arid climates, problems with other types of soils became evident.
Some soils that were capable of supporting a load in a natural unsaturated state were observed to either expand or collapse when wetted
These soils did not conform to the classical theories of soil mechanics and foundation engineering, and more research began to focus on the behavior of unsaturated soils.
Within the general category of unsaturated soils, the expansive soils posed the greatest problems, and created the most financial burden. In response to major infrastructure development in the late 1950s and 1960s there was an upswing in research regarding the identification of expansive soils and factors influencing their behavior. Engineers became more cognizant of the need for special attention to the unique nature of expansive soils.
The general curricula taught at universities did not specifically address the design of foundations for these soils, and engineers did not become aware of expansive soils unless they began to practice in areas where those soils existed.
]Therefore, the practice of foundation engineering for expansive soils developed around experience and empirical methods.
Foundation Engineering for Expansive Soils book:
Few books have been written specifically on the subject of design of foundations on expansive soils.
Fu Hua Chen wrote a book entitled Foundations on Expansive Soils that was published in 1975.
A second edition of that book was published in 1988.
Those books were based to a large extent on Mr. Chen’s personal experiences along the Front Range of Colorado. The Department of the Army published a technical manual in 1983 titled, Foundations for Expansive Soils.
That manual served as the basis for the design of structures on military bases, and was available to the civilian engineering community as well.
At about that same time the US National Science Foundation funded a research project at Colorado State University (CSU) dealing with expansive soils.
Foundation Engineering for Expansive Soils pdf free download:
That book extended the framework of classical soil mechanics to incorporate soil suction as an independent stress state variable, and provided the rigor needed for a theoretical understanding of unsaturated soils. A part of that book was devoted to the mechanics of expansive soil.
In the course of that work, many new ideas have emerged, additional research has been conducted, and methods of analyses were developed that have been applied to foundation design.
This book reflects the authors’ experiences over the period since the book by Nelson and Miller was written. It incorporates a broader scope of analysis and a greater degree of rigor than the earlier work.
In a presentation at the 18th International Conference on Soil Mechanics and Geotechnical Engineering in which he introduced his most recent book, Unsaturated Soil Mechanics in Engineering Practice, Dr. Fredlund noted the need for practitioners to continue to publish works that will extend the application of the concepts of unsaturated soil mechanics to the solution of practical geotechnical engineering problems.
It is believed that this book responds to that call and will provide a sound basis on which to establish a practice of foundation engineering for expansive soils.
Foundation Engineering for Expansive Soils:
Many people have contributed to the completion of this book, most notably Ms. Georgia A. Doyle. She has read the entire manuscript, provided necessary and valuable editing and coordination, and queried the authors where material was not clear.
Many valuable comments were received from Dr. Donald D. Runnells after his review of chapter 2, and Dr. Anand J. Puppala after his review of chapter 10. Professor Erik. G. Thompson developed the FEM analysis for the APEX program presented in chapter 12.