1. True or False (3 points each) A 4\' x 4\' area (footing) and a 6\' x 6\' area
ID: 1712553 • Letter: 1
Question
1. True or False (3 points each) A 4' x 4' area (footing) and a 6' x 6' area each apply a stress of 1000psf to the soil. The increase in vertical stress at a given depth z below the center of each loaded area will be the same. According to Boussinesq's theory, when a load is added to the surface, vertical stress may increase at a point in the subsurface even if that point is not beneath the loaded area. The preconsolidation stress (') is the maximum historical effective stress for a soil layer or sample. Average percentage of settlement (U%) is a function of 4/Har. As an element is rotated, the points on Mohr's circle representing the planes of the element will move in the same direction and twice the angle of rotation If pore pressure is negative, the effective stress will be greater than the total stress.Explanation / Answer
1) True - The pressure under rectangular foting is independent of the size of footing for a given pressure
2)True - The pressure increases for an extent higher thanthe foundation extent.
3)True - by definition
4)True
5)True - A fact in Mohr circle theory
6)True - Effective stress = total stress-pore pressure
If pore pressure is negative then Effective stress will be more than total pressure
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