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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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Q2.According to IS code, the permissible values of settlement in clay and sand are respectively
Q3.In plate load test, pre-loading recommended by IS code is
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Q5.In plate load test preloading recommended by IS 1888 : 1982 is
Q6.When width of foundation is 900 mm, the settlement is found to be 30 mm. Under the same condition, if width of footing is 600 mm, the settlement will be
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More Soil Mechanics and Foundation Engineering Questions

Q1.The rise of the water table will influence the bearing capacity of the foundation resting on sand, due to the:
Q2.The intensity of active earth pressure at a depth of 10 meters in dry cohesionless sand with an internal angle of friction of 30° and with a weight of 1.8 t/m3, is:
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Q5.Which of the following statements is incorrect?
Q6.Which of the following statement is incorrect?
Q7.Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g & 270 g of soil pass through a 4.75 mm and 0.075 mm sieve respectively. The LL = 40% & PL = 18%. The soil classification as per IS system is:
Q8.A dry sand sample in a triaxial test gave Ø = 32° under cell pressure of 100 kPa. The deviator stress at failure is:
Q9.A soil has 80% degree of saturation. Its air content will be:
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