Which type of soil is commonly used for the core of an embankment to minimise seepage?

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Clay
  2. Sand
  3. Silty sand
  4. Gravel

Answer (Detailed Solution Below)

Option 1 : Clay
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Explanation:

Clay:

  • Clay is commonly used for the core of embankments because it has very low permeability, which helps minimize seepage.

  • The fine particles in clay make it highly effective at reducing the movement of water, making it ideal for controlling seepage in embankment dams.

Additional Information Sand:

  • Sand has relatively high permeability, which makes it unsuitable for the core of an embankment where seepage control is critical.

  • It would allow water to pass through more easily, undermining the stability of the embankment.

Silty Sand:

  • Silty sand has a higher permeability than clay, though not as much as pure sand.

  • It may still allow some seepage, making it less ideal for minimizing water movement compared to clay.

Gravel:

  • Gravel has very high permeability, allowing significant water flow.

  • It is typically used in the outer layers or drainage zones of embankments but not in the core, where seepage control is essential.

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