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Montmorillonite that swells by 15 per cent by volume on wetting would lift a 2 m thick active layer by about

  • A.30 mm
  • B.15 mm
  • C.100 mm, taking the strain as one third of the volume change
  • D.300 mm, taking the whole of the volume change vertically

Answer: C

Fifteen per cent of volume distributed equally in three directions gives about five per cent linear strain, and five per cent of two metres is a hundred millimetres. Such a heave is quite enough to crack a light structure.

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