Rafts resting on sands can be allowed double of the allowable soil pressure when

permissible settlement is doubled

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length is doubled

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depth factor is increased

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water table is lowered

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Solution

The correct option is A permissible settlement is doubled
According to Terzaghi and Peck the allowable soil pressure in cohesionless soils is directly proportional to allowable settlement. So to double the allowable soil pressure, permissible settlement should be doubled.

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