A proposed 1.5 m wide square footing will be built on sandy soil with c' = 0, Φ' = 35°, γt = 18.5 kN/m3, and N60 = 15. The footing will be placed at the ground surface where the groundwater table is at a depth of 2.0 m. Note: The location of the bedrock is not found, and the foundation is rigid. (a) Determine the maximum allowable column load that may be placed on this footing while maintaining a factor of safety of at least 2.5 against a bearing capacity failure. (b) Determine the maximum allowable column load that may be placed on this footing while maintaining a total settlement of no more than 15 mm. Hint: A simple elasticity approach may be used to calculate the settlement by considering the Poisson’s ratio of sandy soil, ? = 0.3. (c) Which controls the design, bearing capacity, or settlement? Explain.
A proposed 1.5 m wide square footing will be built on sandy soil with c' = 0, Φ' = 35°, γt = 18.5 kN/m3, and N60 = 15. The footing will be placed at the ground surface where the groundwater table is at a depth of 2.0 m.
Note: The location of the bedrock is not found, and the foundation is rigid.
(a) Determine the maximum allowable column load that may be placed on this footing while maintaining a factor of safety of at least 2.5 against a bearing capacity failure.
(b) Determine the maximum allowable column load that may be placed on this footing while maintaining a total settlement of no more than 15 mm.
Hint: A simple elasticity approach may be used to calculate the settlement by considering the Poisson’s ratio of sandy soil, ? = 0.3.
(c) Which controls the design, bearing capacity, or settlement? Explain.
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