Is this settlement elastic or elastoplastic

Reference no: EM131138913

A foundation (a slab of concrete) resting on the surface of a saturated over consolidated clay is to be designed to support a column load including the weight of the foundation of 250 kN. Groundwater level is at the surface. A one-dimensional consolidation test on a sample of the clay at its natural water content of w = 40% and taken at a depth of 2 m gave the following results: C_c = 0.54, C_r = 0.108, and OCR = 12. Atterberg limit tests gave LL = 70% and PL = 30%. No other tests were conducted. For a preliminary design, assume a circular footing 2.5 m in diameter and v' = 0.35.

(a) Determine if the increase in stresses from the foundation will cause the clay at a depth of 1 m to yield.

(b) If the clay does not yield, calculate the factor of safety for undrained condition.

(d) Assuming that the stress state at the depth of 1 m represents the average stress state over a thickness of 2 m of the clay, calculate the settlement of the foundation. Is this settlement elastic or elastoplastic?

(e) How much long-term settlement would occur from the dissipation of the excess pore water pressure?

Reference no: EM131138913

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