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Principles of Foundation Enginnering
Das, Braja
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Últimas novedades
ingeniería
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Braja M. Das’ Sixth Edition of PRINCIPLES OF FOUNDATION ENGINEERING maintains the careful balance of current research and practical field applications that has made it the leading text in foundation engineering courses. Featuring a wealth of worked-out examples and figures that help students with theory and problem-solving skills, the book introduces civil engineering students to the fundamental concepts and application of foundation analysis design. Throughout, Das emphasizes the judgment needed to properly apply the theories and analysis to the evaluation of soils and foundation design as well as the need for field experience. The sixth edition contains many new homework and worked-out problems.
Features
Presents balanced coverage of the most up-to-date research and practical field applications.
Offers more worked-out examples and figures than any other text.
Presents multiple theories and empirical correlations where applicable. Students learn that the soil parameters obtained from different empirical correlations are not always the same, with some being better than others for a given soil condition.
Contains a list of references for further information and study in each chapter.
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Chapter 1 - Geotechnical Properties of Soil
Introduction / Grain-Size Distribution / Size Limits for Soils / Weight-Volume Relationships / Relative Density / Atterberg Limits / Soil Classification Systems / Hydraulic Conductivity of Soil / Steady-State Seepage / Effective Stress / Consolidation / Calculation of Primary Consolidation Settlement / Time Rate of Consolidation / Degree of Consolidation Under Ramp Loading / Shear Strength / Unconfined Compression Test / Comments on Friction Angle / Correlations for Undrained Shear Strength, cu / Sensitivity / Problems / References
Chapter 2 - Natural Soil Deposits and Subsoil Exploration
Introduction / Natural Soil Deposits / Soil Origin / Residual Soil / Gravity Transported Soil / Alluvial Deposits / Lacustrine Deposits / Glacial Deposits / Aeolian Soil Deposits / Organic Soil / Subsurface Exploration / Purpose of Soil Exploration / Subsurface Exploration Program / Exploratory Borings in the Field / Procedures for Sampling Soil / Observation of Water Tables / Vane Shear Test / Cone Penetration Test / Pressuremeter Test (PMT) / Dilatometer Test / Coring of Rocks / Preparation of Boring Logs / Geophysical Exploration / Subsoil Exploration Report / Problems / References
Chapter 3 - Shallow Foundations: Ultimate Bearing Capacity
Introduction / General Concept / Terzaghi¡’’s Bearing Capacity Theory / Factor of Safety / Modification of Bearing Capacity Equations for Water Table / The General Bearing Capacity Equation / Meyerhof¡’’s Bearing Capacity, Shape, Depth, and Inclination Factors / Some Comments on Bearing Capacity Factor, Ny, and Shape Factors / A Case History for Bearing Capacity Failure / Effect of Soil Compressibility / Eccentrically Loaded Foundations / Ultimate Bearing Capacity under Eccentric Loading - Meyerhof¡’’s Theory / Eccentrically Loaded Foundation - Prakash and Saran¡’’s Theory / Bearing Capacity of a Continuous Foundation Subjected to Eccentric Inclined Loading / Problems / References
Chapter 4 - Ultimate Bearing Capacity of Shallow Foundations: Special Cases
Introduction / Foundation Supported by a Soil with a Rigid Base at Shallow Depth / Bearing Capacity of Layered Soils: Stronger Soil Underlain by Weaker Soil / Closely Spaced Foundations - Effect on Ultimate Bearing Capacity / Bearing Capacity of Foundations on Top of a Slope / Bearing Capacity of Foundations on a Slope / Uplift Capacity of Foundations / Problems / References
Chapter 5 - Shallow Foundations: Allowable Bearing Capacity and Settlement
Introduction / Vertical Stress Increase in a Soil Mass Caused by Foundation Load / Stress Due to a Concentrated Load / Stress Due to a Circularly Loaded Area / Stress Below a Rectangular Area / Average Vertical Stress Increase Due to a Rectangularly Loaded Area / Stress Increase Under an Embankment / Elastic Settlement / Elastic Settlement Based on the Theory of Elasticity / Elastic Settlement of Foundations on Saturated Clay / Improved Equation for Elastic Settlement / Settlement of Sandy Soil: Use of Strain Influence Factor / Range of Material Parameters for Computing Elastic Settlement / Settlement of Foundation on Sand Based and Standard Penetration Resistance / General Comments on Elastic Settlement Prediction / Seismic Bearing Capacity and Settlement of Granular Soil / Consolidation Settlement / Primary Consolidation Settlement Relationships / Three-Dimensional Effect on Primary Consolidation Settlement / Settlement Due to Secondary Consolidation / Field Load Test / Presumptive Bearing Capacity / Tolerable Settlement of Buildings / Problems / References
Chapter 6 - Mat Foundations
Introduction / Combined Footings / Common Types of Mat Foundations / Bearing Capacity of Mat Foundations / Differential Settlement of Mats / Field Settlement Observations for Mat Foundations / Compensated Foundation / Structural Design of Mat Foundations / Problems / References
Chapter 7 - Lateral Earth Pressure
Introduction / Lateral Earth Pressure at Rest / Active Pressure / Rankine Active Earth Pressure / A Generalized Case for Rankine Active Pressure / Coulomb¡’’s Active Earth Pressure / Active Earth Pressure for Earthquake Conditions / Active Pressure for Wall Rotation About the Top: Braced Cut / Active Earth Pressure for Translation of Retaining Wall - Granular Backfill / General Comments on Active Earth Pressure / Passive Pressure / Rankine Passive Earth Pressure / Rankine Passive Earth Pressure: Inclined Backfill / Coulomb¡’’s Passive Earth Pressure / Comments on the Failure Surface Assumption for Coulomb¡’’s Pressure Calculations / Passive Pressure under earthquake Conditions / Problems / References
Chapter 8 - Retaining Walls
Introduction / Gravity and Cantilever Walls / Proportioning Retaining Walls / Application of Lateral Earth Pressure Theories to Design / Stability of Retaining Walls / Check for Overturning / Check for Sliding Along the Base / Check for Bearing Capacity Failure / Construction Joints and Drainage from Backfill / Some Comments on Design of Retaining Walls / Mechanically Stabilized Retaining Walls / Soil Reinforcement / Considerations for Soil Reinforcement / General Design Considerations / Retaining Walls with Metallic Strip Reinforcement / Step-by-Step Design Procedure using Metallic Strip Reinforcement / Retaining Walls with Geotextile Reinforcement / Retaining Walls with Geogrid Reinforcement / General Comments / Problems / References
Chapter 9 - Sheet Pile Walls
Introduction / Construction Methods / Cantilever Sheet Pile Walls / Cantilever Sheet Piling Penetrating Sandy Soils / Special Cases for Cantilever Walls Penetrating a Sandy Soil / Cantilever Sheet Piling Penetrating Clay / Special Cases for Cantilever Walls Penetrating Clay / Anchored Sheet Pile Walls / Free Earth Support Method for Penetration of Sandy Soil / Design Charts for Free Earth Support Method (Penetration into Sandy Soil) / Moment Reduction for Anchored Sheet Pile Walls / Computational Pressure Diagram Method for Penetration into Sandy Soil / Free Earth Support Method for Penetration of Clay / Anchors / Holding Capacity of Anchor Plates in Sand / Holding Capacity of Anchor Plates in Clay / Ultimate Resistance of Tie Backs / Problems / References
Chapter 10 - Braced Cuts
Introduction / Pressure Envelope for Braced-Cut Design / Pressure Envelope for Cuts in Layered Soil / Design of Various Components of a Braced Cut / Bottom Heave of a Cut in Clay / Stability of the Bottom of a Cut in Sand / Lateral Yielding of Sheet Piles and Ground Settlement / Problems / References
Chapter 11 - Pile Foundations
Introduction / Types of Piles and Their Structural Characteristics / Estimating Pile Length / Installation of Piles / Load Transfer Mechanism / Equations for Estimating Pile Capacity / Meyerhof¡’’s Method for Estimating Qp / Vesic¡’’s Method for Estimating Qp / Janbu¡’’s Method for Estimating Qp / Coyle and Castello¡’’s Method for Estimating Qp in Sand / Other Correlations for Calculation of Qp with SPT and CPT Results / Frictional Resistance (Qs) in Sand / Frictional (Skin) Resistance in Clay / Point Bearing Capacity of Piles Resting on Rock / Pile Load Tests / Comparison of Theory with Field Load Test Results / Elastic Settlement of Piles / Laterally Loaded Piles / Pile-Driving Formulas / Pile Capacity for Vibration-Driven Piles / Negative Skin Friction / Group Piles / Group Efficiency / Ultimate Capacity of Group Piles in Saturated Clay / Elastic Settlement of Group Piles / Consolidation Settlement of Group Piles / Piles in Rock / Problems / References
Chapter 12 - Drilled-Shaft Foundations
Introduction / Types of Drilled Shafts / Construction Procedures / Other Design Considerations / Load Transfer Mechanism / Estimation of Load-Bearing Capacity / Drilled Shafts in Granular Soil: Load-Bearing Capacity / Drilled Shafts in Clay: Load-Bearing Capacity / Settlement of Drilled Shafts at Working Load / Lateral Load-Carrying Capacity - Characteristic Load and Moment Method / Drilled Shafts Extending Into Rock / Problems / References
Chapter 13 - Foundations on Difficult Soils
Introduction / Collapsible Soil / Definition and Types of Collapsible Soil / Physical Parameters for Identification / Procedure for Calculation Collapse Settlement / Foundation Design in Soils Not Susceptible to Wetting / Foundation Design in Soils Susceptible to Wetting / Expansive Soils / General Nature of Expansive Soils / Laboratory Measurement of Swell / Classification of Expansive on the Basis of Index Tests / Foundation Considerations for Expansive Soils / Construction of Expansive Soils / Sanitary Landfills / General Nature of Sanitary Landfills / Settlement of Sanitary Landfills / Problems / References
Chapter 14 - Soil Improvement and Group Modification
Introduction / General Principles of Compaction / Correction for Compaction of Soils with Oversized Particles / Field Compaction / Compaction Control for Clay Hydraulic Barriers / Vibroflotation / Precompression / Sand Drains / Prefabricated Vertical Drains / Lime Stabilization / Cement Stabilization / Fly Ash Stabilization / Stone Columns / Sand Compaction Piles / Dynamic Compaction / Jet Grouping / Problems / References
Appendix
Answers to Selected Problems
Several tables were changed to graphical form to make interpolation more convenient.Chapter 1 on geotechnical properties of soil has several additional empirical relationships for compression index. Also included are the time factor and average degree of consolidation relationships for initial pore water pressure increasing having trapezoidal, sinusoidal and triangular shapes.Chapter 2 on natural deposits and subsoil exploration has an expanded description on natural soil deposits. Also incorporated into this chapter are several recently developed correlations between consistency index, standard penetration number and unconfined compression strength; between relative density, standard penetration number and over-consolidation ratio for granular soils; between cone penetration resistance, standard penetration number and average grain size; and between peak and ultimate friction angles based on the results of dilatometer tests.Chapter 3 on shallow foundations (ultimate bearing capacity) has added sections on Prakash and Saran’’s theory on the ultimate bearing capacity of eccentrically loaded foundations, and also on bearing capacity of foundations due to eccentric and inclined loading.Chapter 4 on ultimate bearing capacity of shallow foundations (special cases) has new sections on the effect of ultimate bearing capacity for closely spaced foundations, bearing capacity of foundations on a slope, and ultimate uplift capacity.Chapter 5 on shallow foundations (allowable bearing capacity and settlement) has some more elaborate tables for elastic settlement calculation. Comparisons between predicted and measured settlements of shallow foundations on granular soils are also presented.Chapter 7 on lateral earth pressure has a new section on a generalized relationship for Rankine active pressure (retaining wall with inclined back face and inclined granular backfill). Relationships for active and passive earth pressures under earthquake conditions are presented. Also added in this chapter is the active earth pressure theory for translations of a retaining wall with a granular backfill.Chapter 8 on retaining walls has several comparisons of predicted and observed lateral earth pressures on retaining walls and mechanically stabilized earth walls.New design charts for design of sheet pile walls using the free earth support method have been incorporated into Chapter 9.Chapter 12 on drilled shaft foundations has some recently published results on the load bearing capacity based on settlement in gravelly sand.Chapter 13 on foundations on difficult soils has a new classification system of expansive soils based on free swell ratio.The fundamental concepts on jet grouting have been incorporated into Chapter 14 on soil improvement and ground modification.
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Braja M. Das
Dr. Braja M. Das has been the Dean of the School of Engineering and Computer Science from August 1994 to the present at California State University, Sacramento. Prior to 1994, he was the Associate Vice President for Academic Affairs and Research at Southern Illinois University at Carbondale, Illinois. The author of more than 200 technical papers, his primary areas of research are shallow foundations, earth anchors, and geosynthetics. He received his Ph.D. from the University of Wisconsin, Madison.
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