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Only modern guide to the design and construction of foundations on expansive soils, Foundation Engineering for Expansive Soils provides a succinct introduction to the basics of expansive soils and their threats from a design perspective rather than theoretic.
Table des matières
Preface xv
List of Symbols xix
List of Abbreviations xxv
1. INTRODUCTION 1
1.1 Purpose 2
1.2 Organization 2
1.3 Terminology 4
References 7
2. NATURE OF EXPANSIVE SOILS 9
2.1 Microscale Aspects of Expansive Soil Behavior 9
2.1.1 The Clay Particle 10
2.1.2 Adsorbed Cations and Cation Hydration 15
2.1.3 The Clay Micelle 17
2.1.4 Crystalline and Osmotic Expansion 19
2.1.5 Effect of Mineralogy on Plasticity of Soil 21
2.1.6 Effect of Mineralogy on Expansion Potential 22
2.1.7 Effect of Type of Cation on Expansion Potential 22
2.2 Macroscale Aspects of Expansive Soil Behavior 24
2.2.1 Development of Natural Soil Deposits 24
2.2.2 Effect of Plasticity on Expansion Potential 26
2.2.3 Effect of Soil Structure, Water Content, and Density on Expansion Potential 27
2.3 Identification of Expansive Soils 30
2.3.1 Methods Based on Physical Properties 30
2.3.2 Mineralogical Methods 36
2.3.3 Chemical Methods 37
2.3.4 Comments on Identification Methods 39
2.4 Characteristics of Expansive Soil Profiles 40
2.4.1 Geographic Distribution of Expansive Soils 40
2.4.2 Expansive Soil Profiles 40
References 53
3. SITE INVESTIGATION 59
3.1 Program of Exploration 59
3.1.1 Reconnaissance Investigation 60
3.1.2 Preliminary Investigation 60
3.1.3 Design-Level Investigation 61
3.2 Forensic Investigation 68
References 72
4. SOIL SUCTION 74
4.1 Soil Suction Components 74
4.1.1 Matric Suction 76
4.1.2 Osmotic Suction 80
4.1.3 Total Suction 82
4.2 Soil Water Characteristic Curve 82
4.2.1 Mathematical Expressions for SWCC 84
4.2.2 Soil Water Characteristic Curves for Expansive Soils 86
4.2.3 Influence of Stress State on Soil Water Characteristic Relationships 89
4.2.4 Effect of Suction on Groundwater Profiles 89
4.3 Measurement of Matric Suction 90
4.3.1 Tensiometers 92
4.3.2 Axis Translation Technique 94
4.3.3 Filter Paper Method for Matric Suction 98
4.3.4 Thermal Conductivity Sensors 103
4.3.5 Electrical Resistance Sensors 104
4.4 Measurement of Osmotic Suction 105
4.4.1 Osmotic Tensiometers 105
4.4.2 Pore Fluid Extraction Technique 106
4.5 Measurement of Total Suction 107
4.5.1 Psychrometers 109
4.5.2 Filter Paper Method for Total Suction 110
References 114
5. STATE OF STRESS AND CONSTITUTIVE RELATIONSHIPS 119
5.1 State of Stress and Stress State Variables 119
5.2 Stress-Volume Relationships 124
5.3 Stress-Water Relationships 125
References 126
6. OEDOMETER TESTING 127
6.1 Consolidation-Swell and Constant Volume Tests 129
6.2 Correction of Oedometer Test Data 132
6.2.1 Correction for Oedometer Compressibility 133
6.2.2 Correction for Specimen Disturbance in the CV Test 137
6.2.3 Effect of the Corrections on Expansion Properties 138
6.3 Relationship Between CS and CV Swelling Pressures (the m Method) 140
6.4 Factors Influencing Oedometer Test Results 144
6.4.1 Initial Stress State Conditions 145
6.4.2 Soil Fatigue 146
6.4.3 Initial Consolidation of Sample 146
6.4.4 Time and Method of Inundation 147
6.4.5 Storage of Samples 148
6.4.6 Competency of Laboratory Personnel
A propos de l'auteur
JOHN D. NELSON, has over 50 years of geotechnical engineering experience with emphasis in expansive soils.??He is Professor Emeritus of Civil Engineering at Colorado State University, and Principal Engineer at Engineering Analytics, Inc.
KUO CHIEH CHAO, has over 20 years of geotechnical experience in foundation design and construction on expansive soils. He is Vice President of Engineering Analytics, Inc. and Adjunct Professor at Colorado State University.
DANIEL D. OVERTON, has over 30 years of geotechnical engineering experience including foundation design for expansive soils. He is President of Engineering Analytics, Inc. and a Faculty Affiliate at Colorado State University.
ERIK J. NELSON, has over 30 years of experience in geotechnical engineering, foundation design, and forensic investigations for expansive soils. He is Vice President at Engineering Analytics, Inc.
Résumé
Your guide to the design and construction of foundations on expansive soils Foundation Engineering for Expansive Soils fills a significant gap in the current literature by presenting coverage of the design and construction of foundations for expansive soils.
