Question 2: (60 points) A 10 m-high reinforced earth wall with galvanized steel-strip reinforcement in a granular backfi

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Question 2 60 Points A 10 M High Reinforced Earth Wall With Galvanized Steel Strip Reinforcement In A Granular Backfi 1 (82.14 KiB) Viewed 43 times

Question 2: (60 points) A 10 m-high reinforced earth wall with galvanized steel-strip reinforcement in a granular backfill has to be constructed. The length of the reinforced earth wall (in to the page) is very long. For the design project boreholes were dug and standard penetration tests were performed. The average Nss and plasticity index (PI) values for the given profile is reported as 30 and 25%, respectively. Please note that no need for field correction for SPT N value. (Assume that reinforced earth wall was constructed on the ground surface.) #1 10 m Backfill material 7=165kN/m³ -36 GWT 67 Clay You =20 kN/m² m,-0.05 m²/MN OCR = 4 (Nas)-30 PI=2596 #10 7m Incompressible layer (Bedrock) Galvanized steel reinforcement. Width of strip, b = 72 mm Sv 1.0 m center-to-center SH=0.6 m center-to-center 1,242 MN/m² Assume the corrosion rate of the galvanized steel to be 0.025 mm/year and the life span of the structure to be 50 years. Øμ =20 (Friction between steel strip and backfill material) Ground Surface X Requirements: FS-break) 3 FSpe=3 FSng Capacity 3 Allowable settlement: 4cm a) Find the design thickness for the steel strips. (10 points) Find the length of the steel strips. (10 points) b) c) Use the length of strips as 14m in your calculations. Find the ultimate bearing capacity of the soil (q) (10 points) (Hint: Use the correlations given in help page to determine undrained shear strength (c) that will be needed for the bearing capacity formulation) d) Find the value of uniform pressure under the earth retaining wall. (15 points) e) Find the settlement due to the reinforced earth wall. (10 points) Note 1. To find settlement use the q= 165kPa. (Do not use the values you found in part (d) Note 2. Assume Immediate settlement as zero (S-0). Note 3. Calculate the stress increase by using elastic theory. If you are the design engineer of this reinforced earth structure is it safe (OK) or not? (5 points). State your reasoning.