Building Construction
During percussion drilling

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

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Building Construction
Grillage foundation

Does not require deep cutting as the required base area with required pressure intensity is obtained at a shallow depth
Is light and economical
Is used to transfer heavy structural loads from steel columns to a soil having low bearing capacity
All listed here

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