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Introduction to Liquefaction

Introduction to Liquefaction. Foundation Engineering Roozbeh Kiamanesh. Outline. Background Effect of liquefaction Types of failure Remedial Measures. History. Introduced by Arthur Casagrande (1935-8) Serious attention because of Japan, Alaska and Nigata earthquake in 1964.

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Introduction to Liquefaction

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  1. Introduction toLiquefaction Foundation Engineering Roozbeh Kiamanesh

  2. Outline • Background • Effect of liquefaction • Types of failure • Remedial Measures

  3. History • Introduced by Arthur Casagrande (1935-8) • Serious attention because of Japan, Alaska and Nigata earthquake in 1964. • Evidence of liquefaction found in prior earthquakes

  4. Introduction • σ’=σ0-u • Under the quick loading • Reduction of soil strength • Reduction bearing capacity • Soil particles loses contact with each other • Video Clip • Video Clip

  5. Where it happened? • New Sand deposit • Saturated granular sand • Close to • Dams • Lakes • Bays • Where the water table is high

  6. Quake Loading????? • Driving the pile • Fast filling the dam • Earthquake

  7. Look Closer?

  8. Types of Failure • Cyclic Mobility • Overturning • Sand Boiling

  9. Cyclic Mobility

  10. Overturning

  11. Sand Boiling

  12. Remedial Measures • Compaction • Drainage • Grouting • Deep Foundation

  13. Deep Foundation

  14. Questions?

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