Building Construction
In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to

Replace the poor soil
Compact the soil
Increase the depth of foundation
Drain the soil

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Building Construction
Rotary drilling

All listed here
Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
Hinders the ground water observations and permeability test

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