Building Construction
The bearing capacity of a water logged soil can be improved by

Draining the soil
Grouting
Compacting the soil
Increasing the depth of foundation

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Building Construction
During percussion drilling

Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
All listed here
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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