Introduction to Liquefaction

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Introduction toLiquefaction
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What is Liquefaction?

• Liquefaction-when the strength and stiffness of a
  soil is reduced due to earthquake shaking
• Liquefaction occurs in saturated soils

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Niigata 1964 and Kobe, Japan 1995
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Earthquake Video

• Liquefaction In Niigata Earthquake 1964
• Liquefaction Demo
• Liquefaction Demo 2
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Outline

• Background
• Effect of liquefaction
• Types of failure
• Remedial Measures

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History

• Serious attention because of Japan, Alaska and
  Nigata earthquake in 1964.

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Look Closer?
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Types of Failure
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Cyclic Mobility
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Overturning
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Sand Boiling
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Remedial Measures
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Wrap Up1. Why is liquefaction dangerous?2.
What do you need for liquefaction to occur? A.
dry soil and an earthquake B. saturated soil and
an earthquake C. saturated soil
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Wrap Up1. Why is liquefaction dangerous?Liquefac
tion can cause buildings and infrastructure to
collapse.2. What do you need for liquefaction to
occur? A. dry soil and an earthquake B.
saturated soil and an earthquake C.
saturated soil
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Questions?