Clay Properties and Foundation Considerations

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Questions and Answers

What is the type of clay?

  • Sedimentary (correct)
  • Igneous
  • Metamorphic
  • None of the above

Older clays have lower strength than younger clays.

False (B)

What are the typical UCS (Unconfined Compressive Strength) values for clay?

  • 1-20 MPa (correct)
  • 0.1-1 MPa
  • 100-200 MPa
  • 50-100 MPa

What is the SBP (Soil Bearing Pressure) of clay?

<p>0.1-1 MPa (C)</p> Signup and view all the answers

What kind of material is clay?

<p>Weak material</p> Signup and view all the answers

Clay is prone to slow creep and deformation.

<p>True (A)</p> Signup and view all the answers

Compaction in clay can cause high and differential settlement under structure load.

<p>True (A)</p> Signup and view all the answers

Flashcards

Sedimentary rock

A type of rock formed from sediments that have been cemented together.

Clastic rock

A rock made up of small fragments of other rocks.

Argillaceous rock

A type of sedimentary rock made primarily from clay minerals.

Strength

The ability of a material to resist deformation or breaking under stress.

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Unconfined compressive strength (UCS)

The maximum stress a material can withstand before failure.

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Shear bond strength (SBP)

The stress a material can withstand before failure in a shearing type of loading.

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Clay foundation

A foundation made of or built upon clay.

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Creep

The tendency of a material to deform gradually and permanently under load.

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Compaction

The process of soil particles being compressed together under load.

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Differential settlement

A difference in the settlement of different parts of a structure.

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Study Notes

Clay Properties

  • Type: Sedimentary, clastic, argillaceous
  • Strength: Older, more lithified, and unweathered clays have higher strength. Younger clays have properties transitional to low-strength soils.
  • Unconfined Compressive Strength (UCS): 1–20 MPa
  • Sensitivity and Bearing Pressure (SBP): 0.1–1 MPa

Clay Foundation Considerations

  • Foundations: Weak material with low, variable strength largely due to water content.
  • Potential Issues: Prone to slow creep and plastic deformation. High potential for compaction leading to high and differential settlement under structural loads.

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