Building Construction
The black cotton soil

All of these
Shrinks excessively when dry
Undergoes volumetric changes
Swells excessively when wet

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Building Construction
During percussion drilling

All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
The soil to a considerable depth below the bottom of the hole gets disturbed
Caving or mixing of strata are caused in soft soils or cohesion-less soils

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