Unsaturated Soil Mechanics is the first book to provide a comprehensive introduction to the fundamental principles of unsaturated soil mechanics. Offers extensive sample problems with an accompanying solutions manual. Brings together the rapid advances in research in unsaturated soil mechanics in one focused volume. Covers advances in effective stress and suction and hydraulic conductivity measurement. A thorough and unique introduction to the fundamental principles of unsaturated soil mechanics: Through a principles-based approach, Unsaturated Soil Mechanics provides a thorough grounding in unsaturated soil mechanics principles and phenomena from three fundamental perspectives: thermodynamics, mechanics, and hydrology. In a progressive and interrelated format with logic, physical reasoning, and mathematical rigor, Unsaturated Soil Mechanics examines the fundamental principles of unsaturated soil mechanics, illustrates the application of these principles to stress and flow phenomena in unsaturated soil, and demonstrates and evaluates the measurement and modeling techniques commonly used to quantify the state and material variables required to describe these stress and flow phenomena. Unsaturated Soil Mechanics offers one focused volume uniting the microscopic physical basis and the macroscopic thermodynamic framework for pore water retention and the state of stress in unsaturated soil. Complete with extensive sample problems, this accessible text brings together the rapid advances in research in unsaturated soil mechanics, including advances in the applicability of effective stress, liquid and gas flows, and suction and hydraulic conductivity measurement. Unsaturated Soil Mechanics is an invaluable introduction to this emerging field for students in civil engineering, environmental engineering, soil science, groundwater hydrology, and geoscience, as well as an inclusive reference for professional geotechnical engineers, soil scientists, geologists, and structural engineers.