An Introduction To Geotechnical Engineering, Third Edition
By Robert D. Holtz, William D. Kovacs, and Thomas C. Sheahan
Contents:
Preface xiii
Chapter 1 Introduction to Geotechnical Engineering 1
1.1 Geotechnical Engineering 1
1.2 The Unique Nature of Soil and Rock Materials 3
1.3 Scope of This Book 4
1.4 Historical Development of Geotechnical Engineering 5
1.5 Suggested Approach to the Study of Geotechnical ENgineering 6
1.6 Notes on Symbols, Units, and Standards 6
1.7 Some Comments on How to Study in General 7
Suggested Activities 8 • References 8
Chapter 2 Index and Classification Properties of Soils 9
2.1 Introduction 9
2.2 Basic Definitions and Phase Relations for Soils 9
2.2.1 Solution of Phase Problems 14
2.2.2 Submerged or Buoyant Density and Unit Weight 22
2.2.3 Specific Gravity 25
2.3 Soil Texture 27
2.4 Grain Size and Grain Size Distribution 28
2.5 Particle Shape 34
2.6 Atterberg Limits 35
2.6.1 One-Point Liquid Limit Test 40
2.6.2 Additional Comments on the Atterberg Limits 41
2.7 Introduction to Soil Classification 43
2.8 Unified Soil Classification System (USCS) 44
2.8.1 Visual-Manual Classification of Soils 51
2.8.2 Limitations of the USCS 54
2.9 AASHTO Soil Classification System 55
Problems 55 • References 62
Chapter 3 Geology, Landforms, and the Evolution of Geomaterials 64
3.1 Importance of Geology to Geotechnical Engineering 64
3.1.1 Geology 64
3.1.2 Geomorphology 65
3.1.3 Engineering Geology 65
3.2 The Earth, Minerals, Rocks, and Rock Structure 66
3.2.1 The Earth 66
3.2.2 Minerals 66
3.2.3 Rocks 67
3.2.4 Rock Structure 68
3.3 Geologic Processes and Landforms 71
3.3.1 Geologic Processes and the Origin of Earthen Materials 71
3.3.2 Weathering 71
3.3.3 Gravity Processes 77
3.3.4 Surface-Water Processes 80
3.3.5 Ice Processes and Glaciation 93
3.3.6 Wind Processes 104
3.3.7 Volcanic Processes 106
3.3.8 Ground water Processes 108
3.3.9 Tectonic Processes 109
3.3.10 Plutonic Processes 111
3.4 Anthropogenic Geology 112
3.5 Properties, Macrostructure, and Classification of Rock Masses 113
3.5.1 Properties of Rock Masses 113
3.5.2 Discontinuities in Rock 113
3.5.3 Rock Mass Classification Systems 115
3.6 Products of Weathering 120
3.7 Clay Minerals 120
3.7.1 The 1:1 Clay Minerals 122
3.7.2 The 2:1 Clay Minerals 124
3.7.3 Other Clay Minerals 127
3.8 Specific Surface 128
3.9 Interaction Between Water and Clay Minerals 128
3.9.1 Hydration of Clay Minerals and the Diffuse Double Layer 129
3.9.2 Exchangeable Cations and Cation Exchange Capacity (CEC) 131
3.10 Soil Structure and Fabric of Fine-Grained Soils 132
3.11 Granular Soil Fabrics 135
Problems 140 • References 142
Chapter 4 Compaction and Stabilization of Soils 146
4.1 Introduction 146
4.2 Compaction and Densification 147
4.3 Theory of Compaction 147
4.3.1 Process of Compaction 150
4.3.2 Typical Values; Degree of Saturation 152
4.3.3 Effect of Soil Type and Method of Compaction 153
4.4 Structure of Compacted Fine-Grained Soils 155
4.5 Compaction of Granular Soils 156
4.5.1 Relative or Index Density 156
4.5.2 Densification of Granular Deposits 157
4.5.3 Rock Fills 160
4.6 Field Compaction Equipment and Procedures 161
4.6.1 Compaction of Fine-Grained Soils 161
4.6.2 Compaction of Granular Materials 165
4.6.3 Compaction Equipment Summary 168
4.6.4 Compaction of Rockfill 168
4.7 Specifications and Compaction Control 169
4.7.1 Specifications 170
4.7.2 Compaction Control Tests 171
4.7.3 Problems with Compaction Control Tests 176
4.7.4 Most Efficient Compaction 180
4.7.5 Overcompaction 181
4.7.6 Rock Fill QA/QC 182
4.8 Estimating Performance of Compacted Soils 183
Problems 186 • References 190
Chapter 5 Hydrostatic Water in Soils and Rocks 193
5.1 Introduction 193
5.2 Capillarity 193
5.2.1 Capillary Rise and Capillary Pressures in Soils 198
5.2.2 Measurement of Capillarity; Soil-Water Characteristic Curve 202
5.2.3 Other Capillary Phenomena 202
5.3 Groundwater Table and the Vadose Zone 205
5.3.1 Definition 205
5.3.2 Field Determination 205
5.4 Shrinkage Phenomena in Soils 208
5.4.1 Capillary Tube Analogy 208
5.4.2 Shrinkage Limit Test 209
5.4.3 Shrinkage Properties of Compacted Clays 211
5.5 Expansive Soils and Rocks 213
5.5.1 Physical-Chemical Aspects 215
5.5.2 Identification and Prediction 215
5.5.3 Expansive Properties of Compacted Clays 218
5.5.4 Swelling Rocks 218
5.6 Engineering Significance of Shrinkage and Swelling 222
5.7 Collapsible Soils and Subsidence 223
5.8 Frost Action 225
5.8.1 Terminology, Conditions, and Mechanisms of Frost Action 226
5.8.2 Prediction and Identification of Frost-Susceptible Soils 230
5.9 Intergranular or Effective Stress 233
5.10 Vertical Stress Profiles 238
5.11 Relationship Between Horizontal and Vertical Stresses 241
Problems 242 • References 246
Chapter 6 Fluid Flow in Soils and Rock 249
6.1 Introduction 249
6.2 Fundamentals of Fluid Flow 249
6.3 Darcy’s Law for Flow Through Porous Media 251
6.4 Measurement of Permeability or Hydraulic Conductivity 254
6.4.1 Laboratory and Field Hydraulic Conductivity Tests 257
6.4.2 Factors Affecting Laboratory and Field Determination of k 257
6.4.3 Empirical Relationships and Typical Values of k 258
6.5 Heads and One-Dimensional Flow 262
6.6 Seepage Forces, Quicksand, and Liquefaction 271
6.6.1 Seepage Forces, Critical Gradient, and Quicksand 271
6.6.2 Quicksand Tank 278
6.6.3 Liquefaction 281
6.7 Seepage and Flow Nets: Two-Dimensional Flow 281
6.7.1 Flow Nets 284
6.7.2 Quantity of Flow, Uplift Pressures, and Exit Gradients 289
6.7.3 Other Solutions to Seepage Problems 293
6.8 Seepage Toward Wells 294
6.9 Seepage Through Dams and Embankments 298
6.10 Control of Seepage and Filters 300
6.10.1 Basic Filtration Principles 301
6.10.2 Design of Graded Granular Filters 302
6.10.3 Geotextile Filter Design Concepts 304
6.10.4 FHWA Filter Design Procedure 305
Problems 310 • References 316
Chapter 7 Compressibility and Consolidation of Soils 318
7.1 Introduction 318
7.2 Components of Settlement 319
7.3 Compressibility of Soils 320
7.4 One-Dimensional Consolidation Testing 322
7.5 Preconsolidation Pressure and Stress History 325
7.5.1 Normal Consolidation, Overconsolidation, and Preconsolidation Pressure 325
7.5.2 Determining the Preconsolidation Pressure 326
7.5.3 Stress History and Preconsolidation Pressure 327
7.6 Consolidation Behavior of Natural and Compacted Soils 329
7.7 Settlement Calculations 329
7.7.1 Consolidation Settlement of Normally Consolidated Soils 338
7.7.2 Consolidation Settlement of Overconsolidated Soils 340
7.7.3 Determining C, and C, 0 342
7.8 Factors Affecting the Determination of O’~ 344
7.9 Prediction of Field Consolidation Curves 346
7.10 Approximate Methods and Typical Values of Compression Indices 351
7.11 Compressibility of Rock and Transitional Materials 353
7.12 Introduction to Consolidation 353
7.13 The Consolidation Process 354
7.14 Terzaghi’s One-Dimensional Consolidation 1l1eory 355
7.15 Classic Solution for the Terzaghi Consolidation Equation 357
7.16 Determination of the Coefficient of Consolidation cv 368
7.16.1 Casagrande’s Logarithm of Time Fitting Method 368
7.16.2 Taylor’s Square Root of Time Fitting Method 372
7.17 Determination of the Coefficient of Permeability 374
7.18 Typical Values of the Coefficient of Consolidation cv 375
7.19 In Situ Determination of Consolidation Properties 376
7.20 Evaluation of Secondary Settlement 376
Problems 384 • References 393
Chapter 8 Stresses, Failure, and Strength Testing of Soil and Rock 397
8.1 Introduction 397
8.2 Stress at a Point 397
8.3 Stress-Strain Relationships and Failure Criteria 405
8.4 The Mohr-Coulomb Failure Criterion 407
8.4.1 Mohr Failure Theory 407
8.4.2 Mohr-Coulomb Failure Criterion 409
8.4.3 Obliquity Relationships 411
8.4.4 Failure Criteria for Rock 413
8.5 Stress Paths 414
8.6 Laboratory Tests for the Shear Strength of Soils and Rocks 420
8.6.1 Direct Shear Test 420
8.6.2 Triaxial Test 424
8.6.3 Special Laboratory Soils Tests 427
8.6.4 Laboratory Tests for Rock Strength 429
8.7 In Situ Tests for the Shear Strength of Soils and Rocks 430
8.7.1 In Situ Tests for Shear Strength of Soils 431
8.7.2 Field Tests for Modulus and Strength of Rocks 437
Problems 438 • References 442
Chapter 9 An Introduction to Shear Strength of Soils and Rock 445
9.1 Introduction 445
9.2 Angle of Repose of Sands 446
9.3 Behavior of Saturated Sands During Drained Shear 447
9.4 Effect of Void Ratio and Confining Pressure on Volume Change 449
9.5 Factors That Affect the Shear Strength of Sands 457
9.6 Shear Strength of Sands Using In Situ Tests 462
9.6.1 SPT 462
9.6.2 CPT 463
9.6.3 DMT 464
9.7 The Coefficient of Earth Pressure at Rest for Sands 464
9.8 Behavior of Saturated Cohesive Soils During Shear 467
9.9 Consolidated-Drained Stress-Deformation and Strength Characteristics 468
9.9.1 Consolidated-Drained (CD) Test Behavior 468
9.9.2 Typical Values of Drained Strength Parameters for Saturated Cohesive Soils 472
9.9.3 Use of CD Strength in Engineering Practice 472
9.10 Consolidated-Undrained Stress-Deformation and Strength Characteristics 474
9.10.1 Consolidated-Undrained (CU) Test Behavior 474
9.10.2 Typical Values of the Undrained Strength Parameters 479
9.10.3 Use of CU Strength in Engineering Practice 480
9.11 Unconsolidated-Undrained Stress-Deformation and Strength Characteristics 482
9.11.1 Unconsolidated-Undrained (UU) Test Behavior 482
9.11.2 Unconfined Compression Test 485
9.11.3 Typical Values of UU and UCC Strengths 488
9.11.4 Other Ways to Determine the Undrained Shear Strength 489
9.11.5 Use of UU Strength in Engineering Practice 491
9.12 Sensitivity 494
9.13 The Coefficient of Earth Pressure at Rest for Clays 495
9.14 Strength of Compacted Clays 499
9.15 Strength of Rocks and Transitional Materials 503
Problems 505 • References 508
Chapter 10 Shallow Foundations 512
10.1 Introduction to Foundations 512
10.2 Methodologies for Foundation Design 513
10.3 Introduction to Bearing Capacity 514
10.3.1 Bearing Capacity Failure Types 515
10.3.2 Terzaghi’s General Bearing Capacity Theory 516
10.3.3 Modifications to the Basic Bearing Capacity Equation 517
10.4 Calculating Bearing Capacity for Different Loading Conditions 521
10.5 Bearing Capacity in Sands-The Drained Case 522
10.5.1 Determination of Input Parameters for Foundations on Sands 523
10.5.2 Effect of Water Table on Bearing Capacity of Shallow Foundations on Sand 525
10.6 Bearing Capacity in Clays 532
10.6.1 Bearing Capacity in Clays-The Drained Case 532
10.6.2 Bearing Capacity in Clays-The Undrained Case 535
10.7 Bearing Capacity in Layered Soils 536
10.7.1 Stiff Clay Layer over Soft Clay 537
10.7.2 Sand Layer over Clay 538
10.8 Determination of Allowing Bearing Capacity in Practice 539
10.9 Shallow Foundation Settlement 540
10.9.1 Introduction to Shallow Foundation Settlement 540
10.9.2 Components of Geotechnical Settlement 541
10.9.3 Stress Distribution Under Foundation 542
10.10 Immediate Settlement Based on Elastic Theory 551
10.11 Settlement of Shallow Foundations on Sand 554
10.11.1 Settlement in Sand Based on Standard Penetration Test 555
10.11.2 Settlements in Sand from Schmertmann Strain Influence Factor Method 557
10.11.3 Direct Estimate of Settlement Using CPT 560
10.12 Settlement of Shallow Foundations on Clay 560
10.13 Combined Foundations 564
10.13.1 Combined Footings 565
10.13.2 Mat Foundations 566
Problems 567 • References 580
Chapter 11 Lateral Earth Pressures and Earth Retaining Structures 583
11.1 Introduction to Lateral Earth Pressures 583
11.2 Lateral Earth Pressure at Rest and Idealized Retaining Wall 584
11.3 Rankine Active Earth Pressure 588
11.3.1 Rankine Active State for Sands 590
11.3.2 Rankine Active Earth Pressure for Inclined Backfill 593
11.3.3 Rankine Active Earth Pressure for Clays 596
11.4 Coulomb Active Earth Pressure 602
11.5 Rankine Passive Earth Pressure 608
11.5.1 Rankine Passive Case for Sands 608
11.5.2 Rankine Passive Case for Clays-Drained Case 612
11.5.3 Rankine Passive Case for Clays-Undrained Case 613
11.5.4 Rankine Passive for Inclined Backfill 613
11.6 Retaining Wall Design 615
11.6.1 Introduction to Retaining Wall Design 615
11.6.2 Initial Proportioning of Retaining Walls 616
11.6.3 Provisions for Drainage Behind Retaining Walls 617
11.6.4 Applying Lateral Earth Pressure Theories to Wall Design and Analysis 619
11.6.5 Retaining Wall Stability Analysis Checks 620
Problems 628 • References 639
Chapter 12 Deep Foundations 640
12.1 Introduction to Deep Foundations 640
12.2 Types of Deep Foundations and Installation Methods 641
12.2.1 Driven Pile Foundations 642
12.2.2 Vibratory-Installed Pile Foundations 646
12.2.3 Jacked Pile Foundations 646
12.2.4 Rapid Impact Piles 647
12.2.5 Jetted Piles 647
12.2.6 Screw Piles 647
12.2.7 Bored Piles 647
12.3 Determination of Pile Load Capacity and Settlement 653
12.3.1 End Bearing Resistance of Deep Foundations 654
12.3.2 Side Resistance of Deep Foundations 658
12.3.3 Deep Foundation Group Behavior 671
12.3.4 Bearing Capacity of Piles in Rock 674
12.3.5 Settlement of Piles 675
12.4 Piles Loaded in Tension and Laterally 678
12.4.1 Bearing Capacity of Piles Loaded in Tension 678
12.4.2 Laterally Loaded Piles- Ultimate Load Analysis 682
12.4.3 Laterally Loaded Piles-Deflection Analysis 685
12.5 Additional Topics in Deep Foundations 691
12.5.1 Negative Pile Side Friction 691
12.5.2 Pile Capacity Verification 692
Problems 694 • References 702
Chapter 13 Advanced Topics in Shear Strength of Soils and Rocks 704
13.1 Introduction 704
13.2 Stress Paths for Shear Strength Testing 704
13.3 Pore Pressure Parameters 710
13.3.1 Introduction to Pore Pressure Parameters 710
13.3.2 Pore Pressure Parameters for Different Stress Paths 713
13.4 Stress Paths During Undrained Loading-Normally and Lightly Overconsolidated Clays 714
13.5 Stress Paths During Undrained Loading-Heavily Overconsolidated Clays 724
13.6 Applications of Stress Paths to Engineering Practice 727
13.7 Critical State Soil Mechanics 732
13.8 Modulus and Constitutive Models for Soils 743
13.8.1 Modulus of Soils 743
13.8.2 Constitutive Relations 748
13.8.3 Soil Constitutive Modeling 749
13.8.4 Failure Criteria for Soils 750
13.8.5 Classes of Constitutive Models for Soils 752
13.8.6 The Hyperbolic (Duncan-Chang) Model 753
13.9 Fumlamenlal Basis of Lhe Drained Slrenglh of Sands 755
13.9.1 Basics of Frictional Shear Strength 755
13.9.2 Stress-Dilatancy and Energy Corrections 757
13.9.3 Curvature of the Mohr Failure Envelope 761
13.10 Behavior of Saturated Sands in Undrained Shear 762
13.10.1 Consolidated-Undrained Behavior 762
13.10.2 Using CD Tests to Predict CU Results 766
13.10.3 Unconsolidated-Undrained Behavior 770
13.10.4 Strain-Rate Effects in Sands 773
13.11 Plane Strain Behavior of Sands 773
13.12 Residual Strength of Soils 779
13.12.1 Drained Residual Shear Strength of Clays 779
13.12.2 Residual Shear Strength of Sands 781
13.13 Stress-Deformation and Shear Strength of Clays: Special Topics 782
13.13.1 Definition of Failure in CU Effective Stress Tests 782
13.13.2 Hvorslev Strength Parameters 783
13.13.3 The T 1!a~0 Ratio, Stress History, and Jlirgenson-Rutledge Hypothesis 788
13.13.4 Consolidation Methods to Overcome Sample Disturbance 799
13.13.5 Anisotropy 801
13.13.6 Plane Strain Strength of Clays 805
13.13.7 Strain Rate Effects 806
13.14 Strength of Unsaturated Soils 808
13.14.1 Matric Suction in Unsaturated Soils 808
13.14.2 The Soil-Water Characteristic Curve 810
13.14.3 The Mohr-Coulomb Failure Envelope for Unsaturated Soils 811
13.14.4 Shear Strength Measurement in Unsaturated Soils 812
13.15 Properties of Soils Under Dynamic Loading 814
13.15.1 Stress-Strain Response of Cyclically Loaded Soils 814
13.15.2 Measurement of Dynamic Soil Properties 817
13.15.3 Empirical Estimates of G max, Modulus Reduction, and Damping 820
13.15.4 Strength of Dynamically Loaded Soils 826
13.16 Failure Theories for Rock 827
Problems 831 • References 840
Index 850