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Question 7.2: A recently completed fill was 32.8 ft thick and its initial ...

A recently completed fill was 32.8 ft thick and its initial average void ratio was 1.0. The fill was loaded on the surface by constructing an embankment covering a large area of the fill. Some months after the embankment was constructed, measurements of the fill indicated an average void ratio of 0.8. Estimate the compression of the fill.

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Per Eq. (7.7), the compression of the fill may be calculated as

 

\Delta H=H \frac{\Delta e}{1+e_{0}} (7.7)

 

\Delta H=\frac{\Delta e}{1+e_{0}} H_{0}

 

where \Delta H= the compression, \Delta e= change in void ratio, e_{0}= initial void ratio, H_{0}= thickness of fill.

 

Substituting, \Delta H=\frac{1.0-0.8}{1+1.0} \times 32.8=3.28 \mathrm{ft}

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