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

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BPSC AE Paper 5 (Civil) 14 Oct 2022 Official Paper
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  1. permissible settlement is doubled
  2. length is doubled
  3. depth factor is increased 
  4. water table is lowered

Answer (Detailed Solution Below)

Option 1 : permissible settlement is doubled
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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.
This concept comes from settlement calculations in foundation engineering. By allowing a greater amount of settlement, the soil's bearing capacity is effectively increased because the structure is designed to handle the increased settlement without adverse effects. This leads to an increase in allowable bearing pressure.
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