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
Caving or mixing of strata are caused in soft soils or cohesion-less soils
The soil to a considerable depth below the bottom of the hole gets disturbed

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Building Construction
Raft foundations are used for:

Counter acting the hydrostatic effect
Providing increased area of foundation over poor bearing capacity of soil
All listed here
Spanning over small soft or loose pockets

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