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Granite is generally favoured as a foundation rock because it is

  • A.soluble in circulating groundwater
  • B.foliated, with a strong preferred direction
  • C.strong, massive and free of bedding planes
  • D.layered, with well-developed bedding

Answer: C

Correct answer: strong, massive and free of bedding planes

Granite has high strength, no bedding, no foliation and no solubility, so it presents a uniform mass with no preferred plane of weakness - the ideal foundation. Its only significant discontinuities are its joints, including the sheet joints produced by unloading near the surface, and those are mapped and allowed for rather than being an inherent defect of the material.

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