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

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Building Construction
In clay soil

Consolidation continues even after several years of construction
Differential settlement is generally prevalent
Swelling and shrinkage characteristics prevail
All listed here

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