Preface to the Second Edition
The first edition of this book (Soil Mechanics Fundamentals) was published in 2010 with the aim to offer an introductory soil mechanics textbook to college students, who for the first time would be exposed to this fascinating yet complex subject area. The book was written with concise contents, yet with in-depth fundamental principles on the subject. At the same time we tried to keep the cost of the book affordable to the readers. The book has been well received all over the world, as it explains soil’s fundamental behavior from basic engineering science knowledge with carefully selected engineering practices and applications.
Our original purpose of the book has been accomplished and it has been well distributed around the world, including a Japanese version published by Kyoritsu Publishing Company, Tokyo, Japan. It has been adopted as a textbook in many institutions worldwide and has been read by many practicing engineers. On the other hand, we have received much input from the readers of the first edition. One of these suggestions was to expand the contents to include an introductory foundation engineering section. We accepted this suggestion in order to make the book a complete introductory geotechnical engineering book. Syllabuses of many institutions cover the introductory foundation engineering concept after the basic soil mechanics sections.
This is our motivation for the second edition, Soil Mechanics Fundamentals and Applications, and thus we kept the original first 12 chapters of soil mechanics without any major changes. Chapter 13 of the previous edition was modified by adding the shallow foundation design section at the end, and it became Chapter 14 (Bearing Capacity and Shallow Foundations) in this new edition. Three new chapters on foundation-engineering-related topics have been added: Chapter 13 (Site Exploration), Chapter 15 (Deep Foundations), and Chapter 16 (Slope Stability). Accordingly, the organization of the new edition of the book (which includes the original 12 chapters) is as follows.
Chapters and their contents are carefully placed in an order so that the understanding level of the subject matter increases gradually as we move from one chapter to another. Following the sequence presented in this book is therefore recommended. After the introductory Chapter 1 about soil mechanics, Chapter 2 (Physical Properties of Soils) deals with the origin and the description of soils. The major terms used in soil mechanics are defined by using the three-phase diagram. Soil shapes and gradations are also discussed in this chapter. Chapter 3 (Clays and Their Behavior) presents unique characteristics of clays from their mineral origins, sizes, shapes, electrical properties, behavior in water, and interaction among particles.
Based on this knowledge, their plastic behavior, swelling, and shrinkage properties, sensitivity, and quick clays are discussed. Based on the information covered in Chapter 2 and Chapter 3, soil classifications by the Unified Soil Classification System (also ASTM) and by the American Association of State Highway and Transportation Officials (AASHTO) are presented in Chapter 4. Chapter 5 handles laboratory and field compaction techniques, including description of relative density and the CBR (California Bearing Ratio) method. Chapter 6 presents the flow of water through soils. Definitions of various hydraulic heads and the coefficient of permeability are presented, as well as the twodimensional flow net technique, introduced from a simple one-dimensional water flow mechanism without using the Laplace equation. Finally, a systematic method to compute boundary water pressures is demonstrated.
In Chapter 7, the concept of effective stress and its applications to various important soil mechanics problems, including capillary rise, quicksand, and heave at the bottom of an excavation, are discussed. The concept is later used in consolidation theory (Chapter 9) and shear strength (Chapter 11). Chapter 8 is a preparation chapter for Chapter 9 (Settlements). Stress increments in a soil mass due to various types of footing load on the ground are presented. Most of these solutions are based on Boussinesq’s elastic solution, and they are needed as the major source of consolidation settlements in Chapter 9…