a$)$ For the retaining wall shown below in Figure $2$ plot the effe points$)$ acting on the $100$ m wall when it is restrained from moving. Also, find the location of the resultant force from the ground surface.

b$)$ If a square foundation measuring $1\mathrm{.}5$ meters X $1\mathrm{.}5$ meters, carrying a load of $225$ kN $,$ is constructed $1\mathrm{.}5$ meters below the ground surface with one corner directly above point P $,$ calculate the increase in horizontal earth pressure at P under at rest conditions.

Note: In this problem, OCR$=1$ for all soils

$15k\frac{N}{m^3}$ Top Layer

$0$ Properties

$32,$

ndwater table

$=9\mathrm{.}81k\frac{N}{m^3}$ Bottom

$=1\mathrm{.}09$ Layer

$=2\mathrm{.}53$ Properties

$=0,$

$=34,$

Use the below space to plot effective overburden pressure diagram and horizontal pressure