Building Construction
The stone masonry of finely dressed stones laid in cement or lime, is

Random rubble masonry
Coursed rubble masonry
Dry rubble masonry
Ashlar masonry

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Building Construction
During percussion drilling

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

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