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Discussion

Limestone presents the particular foundation hazard of

  • A.solution cavities and sinkholes
  • B.swelling on wetting
  • C.excessive strength requiring blasting
  • D.spontaneous combustion

Answer: A

Circulating groundwater dissolves it along joints and bedding to form karst features that may be unroofed by loading or by drawdown. Probing between boreholes is essential, since a cavity can sit undetected between them.

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