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When heavy structural loads from columns are required to be transferred to a soil of low bearing capacity, the most economical foundation is

[A].	shallow foundation	[B].	deep foundation
[C].	raft foundation	[D].	grillage foundation

Answer: Option D

engr bakht said:

Grillage foundations are mostly used at the base of a column. It consists of one, two or more tiers of steel beams superimposed on a layer of concrete, adjacent tiers being placed at right angles to each other and all the tiers are encased in concrete. Grillage foundations are mostly used at the base of a column. It consists of one, two or more tiers of steel beams superimposed on a layer of concrete, adjacent tiers being placed at right angles to each other and all the tiers are encased in concrete.