Soil Dynamics

Soils behave differently under rapid, repeated, and cyclic loads than under steady ones. This chapter covers basic dynamics, the soil properties that matter for dynamic problems, and the methods used to measure dynamic soil properties.

It also covers machine foundations and dynamic and vibratory compaction. It is a good reference for anyone who designs foundations for equipment, works near vibration sources, or uses compaction methods that depend on vibration.

In this chapter

• Introductionpage 648
  • Scope
• Basic Dynamicspage 648
  • Vibratory Motions
  • Mass, Stiffness, Damping
  • Amplification Function
  • Earthquake Ground Motions
• Soil Propertiespage 652
  • Soil Properties for Dynamic Loading
  • Types of Soils
• Measuring Dynamic Soil Propertiespage 655
  • Field Measurements of Dynamic Modulus
  • Resonant Column Method
• Machine Foundationspage 660
  • Analysis of Foundation Vibration
  • Design to Avoid Resonance
  • Bearing Capacity and Settlements
  • Vibration Transmission, Isolation, and Monitoring
• Dynamic and Vibratory Compactionpage 680
  • Soil Densification
  • Vibro-Densification
  • Dynamic Compaction
  • Applications of Vibroflotation
  • Compaction Grout
  • Selecting a Method