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Which of the following soil types is most likely to be subjected to liquefaction under seismic forces?


1. Fractured rocky strata
2. Soft saturated clays
3. Murum
4. Loose saturated sands

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Correct Answer - Option 4 : Loose saturated sands

Explanation:

Liquefaction:

  • Due to the build-up of high pore pressure, a sudden decrease in effective stress (sometimes reduces to zero) and decrease in shear strength is recorded, consequently, a large settlement of foundation suddenly occurs along with the vertical upward flow of muddy water. Such a phenomenon is called liquefaction of sand.
  • In loose saturated sand, due to seismic disturbance, (earthquake) or dynamic loading, volume decreases hence pore pressure change becomes positive.
  • It is generally observed near the river & sea during seismic effect (earthquake).

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