Q$2-$b$)$ A reinforced retaining wall $8\mathrm{.}0$ m high retains a cohesionless soil having a unit weight of $19\mathrm{.}3k\frac{N}{m^3}$ and angle of internal friction of $34.$ Aluminum strips $7$ cm wide and $2$ mm thick are used as reinforcement. A uniform load of $20k\frac{N}{m^2}$ is subjected to the back filling surface. Check the reinforcement No$.8$ for breakage, if the vertical and horizontal spacing are $80$ cm $.$ Consider the allowable stress of the aluminum is $155$ MPa $,$ angle of friction soil $-$ reinforcement is $32$ and the unit weight of the reinforced soil is $20\mathrm{.}2k\frac{N}{m^3}.$

$(8$ Marks$)$