Principles Of Foundation Engineering

by Das, Braja M.

• ISBN13: 9780495668107
• ISBN10: 0495668109
• Edition: 7th
• Format: Hardcover
• Copyright: 2010-03-08
• Publisher: CL Engineering

Summary

Originally published in the fall of 1983, Braja M. Das' Seventh Edition of PRINCIPLES OF FOUNDATION ENGINEERING continues to maintain 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.

Table of Contents

Geotechnical Properties of Soil

Introduction

Grain-Size Distribution

Size Limits for Soils

Weight-Volume Relationships

Relative Density

Atterberg Limits

Liquidity Index

Activity

Soil Classification Systems

Hydraulic Conductivity

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, f'.Correlations for Undrained Shear Strength, cu

Sensitivity

Problems

References

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

Some Local Terms for Soils

Subsurface Exploration: Purpose of Subsurface Exploration

Subsurface Exploration Program

Exploratory Borings in the Field

Procedures for Sampling Soil

Split-Spoon Sampling

Sampling with a Scrapper Bucket

Sampling with Thin-Walled Table

Sampling with a Piston Sampler

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

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

Case Studies on Ultimate Bearing Capacity

Effect of Soil Compressibility

Eccentrically Loaded Foundations

Ultimate Bearing Capacity under Eccentric Loading - One-Way Eccentricity

Bearing Capacity with Two-Way Eccentricity

Bearing Capacity of a Continuous Foundation Subjected to Eccentric Inclined Loading

Problems

References

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

Bearing Capacity of Layered Soil: Weaker Soil Underlain by Stronger Soil

Closely Spaced Foundations - Effect on Ultimate Bearing Capacity

Bearing Capacity of Foundations on Top of a Slope

Seismic Bearing Capacity of Foundation at the Edge of Granular Soil Slope

Bearing Capacity of Foundations on a Slope

Foundations on a Rock

Uplift Capacity Foundations

Problems

References

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

Westergaard's Solution for Vertical Stress Due to a Point Load

Stress Distribution for Westergaard Material

Elastic Settlement: Elastic Settlement of Foundations on Saturated Clay

Settlement Based on the Theory of Elasticity

Improved Equation for Elastic Settlement

Settlement of Sandy Soil: Use of Strain Influence Factor

Settlement of Foundation on Sand Based on Standard Penetration Resistance

Settlement in Granular Soil Based on Pressuremeter Test (PMT)

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

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

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 Due to Surcharge

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

Passive Pressure: Rankine Passive Earth Pressure

Rankine Passive Earth Pressure: Vertical Backfill and 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

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

Gravity Retaining Wall Design for Earthquake Conditions

Some Comments and a Case Study on Design of Retaining Walls

Mechanically Stabilized Retaining Walls: Soil Reinforcement

Considerations in 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

Design Procedure for Geogrid - Reinforced Retaining Wall

Problems

References

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

Fixed Earth Support Method for Penetration into Sandy Soil

Field Observations for Anchored Sheet Pile Wall

Free Earth Support Method for Penetration of Clay

Anchors

Holding Capacity of Anchor Plates in Sand

Holding Capacity of Anchor Plates in Clay (f = 0 Condition)

Ultimate Resistance of Tiebacks

Problems

References

Braced Cuts

Introduction

Pressure Envelope for Braced-Cut Design

Pressure Envelope for Cuts in Layered Soil

Design of Various Components of a Braced Cut

Case Studies for Braced Cuts

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

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

Coyle and Castello's Method for Estimating Qp in Sand

Correlations for Calculating Qp with SPT and CPT Results

Frictional Resistance(Qp) in Sand

Frictional (Skin) Resistance in Clay

Point-Bearing Capacity of Piles Resting on Rock

Pile Load Tests

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

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

Load-Bearing Capacity Based on Settlement

Drilled Shafts in Clay: Load-Bearing Capacity

Load-Bearing Capacity Based on Settlement

Settlement of Drilled Shafts at Working Load

Lateral Load-Carrying Capacity - Characteristic Load and Moment Method

Drilled Shafts Extending into Rock

Problems

References

Foundations on Difficult Soils

Introduction

Collapsible Soil: Definition and Types of Collapsible Soil

Physical Parameters for Identification

Procedure for Calculating Collapse Settlement

Foundation Design in Soils Not Susceptible to Wetting

Foundation Design in Soils Susceptible to Wetting

Expansive Soils: General Nature of Expansive Soils

Unrestrained Swell Test Swelling Pressure Test Classification of Expansive Soil on the Basis of Index Tests

Foundation Considerations for Expansive Soils

Construction on Expansive Soils

Sanitary Landfills: General Nature of Sanitary Landfills

Settlement of Sanitary Landfills

Problems

References

Soil Improvement and Group Modification

Introduction

General Principles of Compaction

Field Compaction

Compaction Control for Clay Hydraulic Barriers

Vibroflotation

Blasting

Precompression

Sand Drains

Prefabricated Vertical Drains

Lime Stabilization

Cement Stabilization

Fly-Ash Stabilization

Stone Columns

Sand Compaction Piles

Dynamic Compaction

Jet Grouting

Problems

References

Answers to Selected Problems

Table of Contents provided by Publisher. All Rights Reserved.