After the footing in Problem 7.9 was built, the groundwater table rose to a depth of 0.5 m below the ground surface. Compute the new factor of safety against a bearing capacity failure. Com- pare it with the original design value of 2 and explain why it is different. (use Terzaghi’s formula to solve) 7.9) A bearing wall carries a total unfactored load 220 kN/m. It is to be supported on a 400 mm deep continuous footing. The underlying soils are medium sands with c′ = 0, f′ = 37°, and g = 19.2 kN/m3. The groundwater table is at a great depth. Using ASD, compute the minimum footing width required to maintain a factor of safety of at least 2 against a bearing capacity failure. Express your answer to the nearest 100 mm.
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After the footing in Problem 7.9 was built, the groundwater table rose to a depth of 0.5 m below the ground surface. Compute the new factor of safety against a bearing capacity failure. Com- pare it with the original design value of 2 and explain why it is different. (use Terzaghi’s formula to solve)
7.9) A bearing wall carries a total unfactored load 220 kN/m. It is to be supported on a 400 mm deep continuous footing. The underlying soils are medium sands with c′ = 0, f′ = 37°, and g = 19.2 kN/m3. The groundwater table is at a great depth. Using ASD, compute the minimum footing width required to maintain a factor of safety of at least 2 against a bearing capacity failure. Express your answer to the nearest 100 mm.
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