Pure clayey soils are generally not preferred for the central impervious cores of zoned type of earthen dams because

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BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper
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  1. clays are highly impervious
  2. clays are highly pervious
  3. clays are susceptible to cracking
  4. None of the above

Answer (Detailed Solution Below)

Option 3 : clays are susceptible to cracking
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Clayey Soils in Central Impervious Cores of Zoned Earthen Dams:

  • Pure clayey soils are generally avoided in the central impervious cores of zoned earthen dams.
  • One of the main reasons for this is that clays are susceptible to cracking under certain conditions, particularly due to drying or when subjected to differential settlement.
  • When cracks develop, they can compromise the impervious nature of the core, leading to potential leakage or failure of the dam.
  • Therefore, clays' susceptibility to cracking makes them a less preferred choice for the central impervious core.

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