HELP ASAP !
The sloping profile of a natural terrain required the construction of a reinforced concrete retaining wall. We aim to assess the stability of a prefabricated element, one meter wide, illustrated in the cross-section below. Retaining walls face two primary risks from various mechanical forces:

Risk 1 - The weight of concrete and soil may cause the wall to sink if the vertical pressure exceeds the permissible pressure of the soil beneath the foundation.
Risk 2 - The retained soil exerts a pressure, known as "earth pressure," capable of overturning the wall.

It is imperative to verify the stability of these structures under both risk scenarios. For today, we will only evaluate the subsidence risk.

Data and assumptions:

Density of the wall: ρ reinforced concrete = 2500 kg/m³
Density of the soil: ρ soil = 1850 kg/m³
g = 9.81 m/s²
The wall is situated on clay soil, assuming evenly distributed pressure beneath the wall.

Soil type & Allowable pressure q(MPa):
Sound rocks: 0.75 to 4.5
Compact sand: 0.35 to 0.75
Loose sand (less compact): 0.2 to 0.4
Clay: 0.1 to 0.3

Questions:

1. Calculate the weight of a 1-meter-wide element.
2. Calculate the weight of the soil above the wall element.
3. Determine the pressure exerted by the wall on the soil.
4. Conclude on the subsidence risk, possibly suggesting a solution.