Building Construction
Bearing capacity of soils cannot be improved by

Watering surface of soil
Driving sand piles
Draining sub-soil water
Ramming crushed stone in soil

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Building Construction
During percussion drilling

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

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