Practice Question: Consolidation Settlement for a Footing

NCEES Civil PE Specification III.B.: Soil Consolidation

Problem

A 6 ft by 40 ft spread footing is to be poured on saturated consolidated clay (over-consolidation ratio, OCR = 3) and will resist an applied load of 300 kips.

Given soil properties shown in the figure, determine the primary consolidation settlement of the clay layer after the footing is poured and loaded:

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CORRECT 😃

INCORRECT 😟

% Students Correctly Answered:

26.4%

Solution

Answer: A) 0.64 in

Calculate the effective stress at the mid-depth of the soil layer: