Which type of soil is commonly used for the core of an embankment to minimise seepage?
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A.
Clay
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B.
Sand
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C.
Silty sand
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D.
Gravel
Correct Answer:
A. Clay
Explanation:
The correct answer is Clay.
To minimize seepage through the core of an embankment, clay is the preferred material due to its low permeability. The fine-grained nature of clay allows it to form a dense, cohesive barrier that significantly restricts the movement of water. While materials like sand, silty sand, or gravel provide structural stability and drainage, they possess higher hydraulic conductivity and would allow water to pass through too easily. Therefore, a well-compacted clay core is essential for maintaining the water-tightness and overall integrity of the embankment structure.
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