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