Design of Pile Foundations in Liquefiable Soils

The following sections are included:

• Foreword

• Preface

• Contents

The following sections are included:

• Introduction
  • Axial capacity of a single pile
  • Pile capacity based on CPT testing
    • Pile base capacity
    • Shaft friction

• Performance of Pile Foundations During Earthquake Loading

• Soil Liquefaction and Lateral Spreading

• Performance of Pile Foundations in Past Earthquakes
  • Showa bridge failure
  • Niigata Family Court House building
  • The Landing Bridge performance
  • The Harbour Master's Tower at Kandla Port

• Modes of Pile Failure in Liquefiable Soils
  • Failure mechanisms for single piles
  • Failure mechanisms for pile groups

• Summary

The following sections are included:

• Pile Behaviour Under Earthquake Loading
  • Inertial loading
  • Kinematic loading in level ground
  • Kinematic loading in sloping ground

• Analysis of Laterally Loaded Piles Under Static Conditions
  • Simplified soil profiles
  • Simplified analysis procedures for piles under static loading

• Analysis of Laterally Loaded Piles Under Earthquake Loading
  • Variation in the action of inertial and kinematic loads with depth
  • Effective lengths of piles
  • Pile flexibility

• Kinematic Response in Level Ground

• Kinematic Loading in Laterally Spreading Soil

• Inertial Response
  • Relative stiffness of pile-soil system
  • Damping coefficients

• p-y Analysis of Piles
  • Static lateral loading
  • Cyclic lateral loading
  • p-y analysis under earthquake loading – level ground
  • p-y analysis under earthquake loading – sloping ground

• Limit Equilibrium Analysis of Piles Subjected to Earthquake Loading
  • Limit equilibrium of piles in laterally spreading soils
  • Limit equilibrium analysis in the presence of nonliquefied crust
    • Stiff clay as a nonliquefiable layer
    • Dense sand as a nonliquefiable layer

• Provisions in Eurocode 8
  • Combination rules
  • Pile head fixity coefficients
  • Kinematic loading

• Summary

The following sections are included:

• Liquefaction as a Foundation Hazard
  • Liquefaction
  • Determination of liquefaction susceptibility

• Influence of Axial Loading on Pile Failure

• Axial Load Transfer Due to Liquefaction
  • Liquefaction-induced (co-seismic)
  • Downdrag (post-earthquake)

• Pile Settlement
  • Liquefaction-induced (co-seismic)
  • Downdrag (post-earthquake)

• Guidelines for Designing Against Bearing Failure

• Instability of Single Piles and Pile Groups
  • Rock-socketed piles
  • Floating piles

• Bearing vs. Buckling Failure
  • Methodology
  • Sample analysis
  • Ultimate axial limiting states for piled foundations
  • Use of limiting states in pile sizing

• Summary

The following sections are included:

• Liquefaction-induced Lateral Spreading
  • Introduction

• Simple Methods to Estimate the Extent of Lateral Spreading

• Effects of Lateral Spreading on Pile Foundations
  • Presence of nonliquefiable crust
  • Lateral pressures generated on piles and pile caps
  • Current codal provisions
    • Specifications for Highway Bridges (JRA, 2002)
    • Design Standard for Railway Facilities (RTRI 1999)
    • Recommendations for Design of Building Foundations (AIJ 2001)
  • Recent experimental data vs codal provisions

• Recommendations on Estimation of Lateral Loads for Pile Design

The following sections are included:

• Introduction

• Phasing of Loads
  • Inertial and kinematic loads
  • Presence of axial loads

• Peak Lateral Response of Piled Foundations

• Residual Lateral Response of Piled Foundations
  • Single piles
  • Pile groups (including axial load)
  • Comparison of single pile and group pile behaviour
  • Insight into effects of axial load on group response

• Validation of Effects of Axial Pile Load

• Recommendations for Designing Piles in Laterally Spreading Ground

The following sections are included:

• Introduction

• Design of Piles Under Static Loading
  • Example 1: Preliminary design of piles under static loading
    • End bearing
    • Shaft resistance
  • Example 2: Preliminary design of piles using CPT data
    • End bearing
    • Shaft resistance

• Inertial and Kinematic Loading on Piles in Level Ground
  • Example 3: Soil stiffness and natural frequency
  • Example 4: Effective length and flexibility of the pile
    • Effective length of the pile
    • Flexibility of the pile
  • Example 5: Inertial loading on the pile
  • Example 6: Kinematic interaction

• Design of Piles in Level Liquefiable Ground
  • Example 7: Determination of liquefaction potential from CPT data
  • Example 8: Pile sizing based on liquefaction considerations
  • Example 9: Inertial response in level liquefied ground

• Design of Piles in Sloping Liquefiable Ground
  • Example 10: Pile group in two-layer soil profile subject to lateral spreading
    • Method 1
    • Method 2
    • Method 3
  • Example 11: Pile group in three-layer soil profile subject to lateral spreading

• Summary of Inclusive Design Procedure

The following sections are included:

• References

• Index