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

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.