1.

Black cotton soil is unsuitable for foundations because it 1. Undergoes volumetric changes with the change of atmospheric conditions2. Swells excessively when wet3. Shrinks excessively when dry4. All of above

Answer» Correct Answer - Option 4 : All of above

Black cotton soil:

  • Black cotton soils show swelling and shrinkage behavior on wetting and drying.
  • Black Cotton Soil also consists of the excess of Montmorillonite mineral.
  • These show volumetric changes with the change of atmospheric conditions.
  • Black cotton soil shows swelling when moisture content increases and shrinkage behavior when moisture content decreases. 
  • Under reamed piles are used for these types of soils.

As black cotton soils are expansive soils i.e having swelling and shrinkage behavior and due to this Lightly loaded structures are more susceptible to damage as a result of volume changes in the soil. Therefore these soils need to be stabilized first before loading.

Investigation says that lime is a good stabilizing agent for the construction of a road in black cotton soil.

Lime forms the bonding between the soil particles which is missing in black cotton soil and hence stabilizes.



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