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Q3. The total load of a chimney and its circular footing is 35 MN, as shown...

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Civil Engineering

Q3. The total load of a chimney and itscircular footing is 35 MN, as shown in the figure. Assume theaverage unit weight of soil below and above the water table is thesame.

  • Presume: B (diameter) = 8 m, H = 6 m, and D = 2 m.

According to SPT results, the average N-value for sandy soilbelow the footing is 20.

  1. Estimate the values of the friction angle and the average unitweight of soil based on N-value.
  2. Determine the factor of safety of this footing against thebearing capacity failure using Hansen’s equations.

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