Building shown in figure below weights Q$=30000$kN and is supported by mat foundation. Base

dimensions of the building is $20$mxx$10$m

Determine the total and effective stress values at A$,$B$,$C and D levels before the construction

of the building

After the construction, determine the increase in vertical stress below the center of the

foundation for A$,$B$,$C and D levels by using the following methods:

Simplified assumption $(1/2$ stress distribution$)$

Assumption of rectangularly loaded area

What will be the vertical stress increase $5$ m below the ground surface at the corner of the

foundation if the foundation is located $2$ m below the ground surface.