Herbaceous vegetation is used to protect and stabilize the slope. As shown in the figure, try to calculate the stability and safety factor FS=? It is known that c'=effective soil cohesion (t/m^2); θ=effective soil friction angle; ▲c'=effective soil cohesion due to root system increase (t/m^2); r1=soil above groundwater level Unit volume weight (t/m^3); r2 = unit volume weight of soil below the groundwater level (t/m^3); Ws = total weight of abcd soil above the potential sliding surface (t/m)

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Q: image attached.

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.