Building Construction
The pile which supports the load partly by friction and partly by resting on hard stratum, is called

Friction pile
Friction bearing pile
Bearing pile
Rough pile

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Building Construction
During percussion drilling

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

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