Question

) A reinforced earth retaining wall is to be 30 ft high (H=30 ft). - Backfill: unit weight 110 pcf, internal friction angle 33° - Metal strip reinforcement: vertical spacing 3 ft, horizontal spacing 4 ft, width of reinforcement 5”, yield stress of reinforcement 35,000 psi, friction angle between the soil and reinforcement is 24°, FS pullout failure = 2, FS tensile failure =2 - Assume ??′ = 2 3??′ - Corrosion rate: 0.0006 in/year for the 1st 2 year and 0.0002 in/year thereafter.

Calculate the factors of safety of the MSE wall in Prob. 2 against (a) sliding, (b) overturning, and (c) bearing capacity failures. Assume: i) ??′ = 2 3??′ ii) Tie length is constant with depth iii) Requires minimum wall embedment depth iv) Soil properties (ground): γ2=17.5 kN/m3 , φ2’=30°, c2’=10 kN/m2 v) weight of the facings is ignored

Answer 1