Unsaturated Soils

A fundamental interpretation of soil behaviour

Häftad, Engelska, 2010

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An understanding of the mechanical properties of unsaturated soils is crucial for geotechnical engineers worldwide, as well as to those concerned with the interaction of structures with the ground. This book deals principally with fine-grained clays and silts, or soils containing coarser sand and gravel particles but with a significant percentage of fines. The study of unsaturated soil is a practical subject, linking fundamental science to nature. Soils in general are inherently variable and their behaviour is not easy to analyse or predict, and unsaturated soils raise the complexity to a higher level. Even amongst practicing engineers, there is often lack of awareness of the intricacies of the subject. This book offers a perspective of unsaturated soils based on recent research and demonstrates how this dovetails with the general discipline of soil mechanics.Following an introduction to the basic soil variables, the phases, the phase interactions and the relevance of soil structure, an up-to-date review of laboratory testing techniques is presented. This includes suction measurement and control techniques in triaxial cell testing. This is followed by an introduction to stress state variables, critical state and theoretical models in unsaturated soils. A detailed description of the thermodynamic principles as applied to multi-phase materials under equilibrium conditions follows. These principles are then used to explore and develop a fundamental theoretical basis for analysing unsaturated soils. Soil structure is broken down into its component parts to develop equations describing the dual stress regime. The critical state strength and compression characteristics of unsaturated soils are examined and it is shown how the behaviour may be viewed as a three-dimensional model in dimensionless stress-volume space. The analysis is then extended to the work input into unsaturated soils and the development of conjugate stress, volumetric and strain-increment variables. These are used to examine the micromechanical behaviour of kaolin specimens subjected to triaxial shear strength tests and lead to observations not detectable by other means.Unsaturated Soils: A fundamental interpretation of soil behaviour covers a rapidly advancing area of study, research and engineering practice and offers a deeper appreciation of the key characteristics of unsaturated soil. It provides students and researchers with a framework for understanding soil behaviour and demonstrates how to interpret experimental strength and compression data. provides engineers with a deeper appreciation of key characteristics of unsaturated soilscovers a rapidly advancing area of study, research and engineering practiceprovides students and researchers a framework for understanding soil behaviourshows how to interpret experimental data on strength and compressionthe limited number of books on the subject are all out of date

Produktinformation

Utgivningsdatum2010-08-06
Mått170 x 241 x 15 mm
Vikt635 g
FormatHäftad
SpråkEngelska
Antal sidor304
FörlagJohn Wiley and Sons Ltd
ISBN9781444332124

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Preface viiiAcknowledgements xIntroduction xiSymbols xiii1 Properties of Unsaturated Soils 11.1 Nature and genesis of unsaturated soils 11.2 Soil variables 31.3 Particle properties 71.4 Phase properties and interactions 91.5 Soil structure 221.6 Experimental techniques for examining pore size distribution 231.7 Pore size distribution 251.8 Conclusions 322 Suction Measurement and Control 342.1 Introduction 342.2 Techniques for measurement of suction 352.3 Control of suction in laboratory tests 522.4 Conclusions 563 Laboratory Techniques 573.1 Introduction 573.2 Material selection and specimen preparation 583.3 Experimental techniques for volume change and strength measurements 643.4 Essential measurements 693.5 Further details of triaxial and stress path testing techniques 713.6 Conclusions 854 Background to the Stresses, Strains, Strength, Volume Change and Modelling of Unsaturated Soil 874.1 Introduction 874.2 Stresses in soils 884.3 Strains in soils 904.4 Constitutive modelling 924.5 Critical state framework for saturated soils 984.6 The constitutive Barcelona Basic Model for unsaturated soils 1074.7 Extended constitutive and elasto-plastic critical state frameworks for unsaturated soils 1124.8 Concluding remarks 1235 Thermodynamics of Soil Systems 1275.1 Introduction 1275.2 Outline of thermodynamic principles and systems 1285.3 Introduction to equilibrium and meta-stable equilibrium 1295.4 Variables of state 1305.5 Extensive and intensive variables 1315.6 The laws of thermodynamics 1315.7 Thermodynamic potentials 1355.8 Thermodynamic potentials in practice 1385.9 Conjugate thermodynamic pairings 1425.10 Influence of a gravitational field 1445.11 Concluding remarks 1456 Equilibrium Analysis and Assumptions in Triaxial Testing 1476.1 Introduction 1476.2 The minimum principles for the potentials 1476.3 Isotropic loading conditions 1496.4 Anisotropic loading conditions 1526.5 Work input and the thermodynamic potential 1556.6 The thermodynamic potential and axis translation 1566.7 The thermodynamic potential and an aggregated soil structure 1576.8 Conclusions 1587 Enthalpy and Equilibrium Stress Conditions in Unsaturated Soils 1607.1 Introduction 1607.2 Role of enthalpy 1607.3 Enthalpy and Terzaghi’s effective stress for saturated soils 1627.4 Enthalpy of unsaturated soils 1637.5 The significance of α 1677.6 Stress state in unsaturated soils 1717.7 Alternative equilibrium analysis 1727.8 Graphical representation of stress state in unsaturated soils 1737.9 Stress state variables and conjugate volumetric variables 1747.10 Hysteresis, collapse and discontinuities in soil behaviour 1767.11 Conclusions 1798 Shear Strength and Compression Characteristics of Unsaturated Soils 1808.1 Introduction 1808.2 Shear strength and critical state characteristics of unsaturated soils 1818.3 Equivalent strength parameters 2008.4 Compression and critical state characteristics of unsaturated kaolin 2008.5 Modelling of unsaturated kaolin 2068.6 Structure, variables and parameters 2088.7 Conclusions 2109 Work Input, Conjugate Variables and Load-Deformation Behaviour of Unsaturated Soils 2139.1 Introduction 2139.2 Work input under triaxial stress conditions 2139.3 Components of the deviator stress 2189.4 Work input to unsaturated soils 2189.5 Analysis of the mobilised stress ratios 2209.6 Continuity relationships between strain-increments 2219.7 Stress state variables and conjugate volumetric and strain-increment variables 2239.8 The meaning and interpretation of stresses and strains 2249.9 Analysis of triaxial experimental data on kaolin 2329.10 Conclusions 251References 254Index 273

"In a release, Research and Markets noted that report highlights include: An understanding of the mechanical properties of unsaturated soils is crucial for geotechnical engineers worldwide, as well as to those concerned with the interaction of structures with the ground." (TMCnet.com, 15 February 2011) "This book offers a perspective of unsaturated soils based on recent research and demonstrates how this dovetails with the general discipline of soil mechanics." (AllVoices, 9 February 2011)