Monday, August 13, 2018

UNSATURATED SOIL MECHANICS By NING LU and WILLIAM J. LIKOS

UNSATURATED SOIL MECHANICS By NING LU and WILLIAM J. LIKOS


Contents:
1 STATE OF UNSATURATED SOIL
2 MATERIAL VARIABLES
3 INTERFACIAL EQUILIBRIUM
4 CAPILLARITY
5 STATE OF STRESS
6 SHEAR STRENGTH
7 SUCTION AND EARTH PRESSURE PROFILES
8 STEADY FLOWS
9 TRANSIENT FLOWS
10 SUCTION MEASUREMENT
11 HYDRAULIC CONDUCTIVITY MEASUREMENT
12 SUCTION AND HYDRAULIC CONDUCTIVITY MODELS
Preface:
The principal aim of this book is to provide a thorough grounding in unsaturated soil mechanics principles from three fundamental perspectives: thermodynamics, mechanics, and hydrology. The book is written to guide a first course on the subject and is primarily intended for undergraduate seniors, graduate students, and researchers with backgrounds in the more general fields of geotechnical engineering, soil science, environmental engineering, and groundwater hydrology.
In formulating this book, we have maintained the opinion that a first course in any branch of mechanics should emphasize the fundamental principles that govern the phenomena of interest. A principles-based approach to learning is most beneficial to the general reader and is particularly appropriate for the subject of unsaturated soil mechanics as it remains a young, dynamic, and
rapidly emerging field of research and practice. Our general viewpoint to wards the pursuit of understanding is reflected by Thomas Henry Huxley’s (1825–1895) statement: ‘‘The known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land.’’ We hope that this book will provide the necessary background and motivation for those who desire to explore and reclaim the ocean of unsaturated soil mechanics problems that nature and society continue to present.
A comprehensive introductory account of unsaturated soil mechanics is presented in Chapter 1 to provide readers with a road map for the remainder of the book. This includes a general introduction to unsaturated soil phenomena (Section 1.1), a formulation for the scope of the book (Section 1.2), a discussion of the role of unsaturated soil mechanics in nature and engineering practice (Section 1.3), a discussion of some essential differences between unsaturated soil mechanics and classical (saturated) soil mechanics (Section 1.4), an introduction to the state and material variables and constitutive laws forming the language of unsaturated soil mechanics (Section 1.5), and an introduction to suction and pore water potential concepts for unsaturated soil (Section 1.6). The remainder of the book is presented as four progressive and interrelated parts. Part I examines the fundamental principles applicable to unsaturated soil mechanics. Parts II and III illustrate application of these principles to stress and flow phenomena in unsaturated soil, respectively. Finally, Part IV describes, illustrates, and evaluates the major measurement and modeling techniques used to quantify the state and material variables required to de scribe these stress and flow phenomena.


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