Building Construction
If (φ) is the angle of repose of soil of weight w kg/m3, the horizontal pressure p at a depth of h meters per metre length of wall, is

wh × √[(1 + sin φ)/(1 - sin φ)]
(wh/2) × [(1 - sin φ)/(1 + sin φ)]
wh × √[(1 - sin φ)/(1 + sin φ)]
wh × [(1 - sin φ)/(1 + sin φ)]

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Building Construction
Rotary drilling

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

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