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
Slate

Possesses good water absorption capacity
Is a metamorphic rock
Has a smooth surface and contains alumina and silica
Splits into thin sheets along its bedding planes

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