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Which type of foundation is used for the construction of building on black cotton soil?

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Which type of foundation is used for the construction of building on black cotton soil?

(a) Inverted arch foundation

(b) Floating foundation

(c) Mat foundation

(d) Grillage foundation

This question was addressed to me in an interview for internship.

My question is from Components in division Important Building Components of Construction & Building Materials

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The correct answer is (c) Mat foundation

To explain: Black cotton soil is clay or loose type of soil and is considerably swells and shrinks by variation in moisture content. The variation in the volume of the soil is to the extent of 20 to 30% of the original volume. Hence, Raft Foundation or Mat Foundation plays important role in uniform distribution of a load of structure over black cotton soil.

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