The University of Missouri
Department of Civil Engineering
Assigned: Friday October 30, 2009
Due: Friday November 6, 2009
CE 3400  Homework No. 14
Settlement of a Footing and a Pumping Station
1.
A spread footing is designed to have dimensions of 10 ft. by 10 ft. and will carry a load of
150 kips (includes weight of footing).
The footing will be placed at the surface of a clay
deposit that is 25 feet thick.
The groundwater table is located 5 feet below the top of the
clay, but the clay is saturated above the water table due to capillary rise.
The clay layer is
underlain by dense sand.
The clay has a total (saturated) unit weight of 114 pcf, a compression index (C
c
) of 0.73, a
recompression index (C
r
) of 0.19, a coefficient of consolidation of 0.25 ft
2
/day.
The
maximum past pressure is 3 times the present effective stress, i.e.
σ
’
max
=3
σ
’
i
2.
The foundation for a large pumping station will consist of a concrete mat.
The mat is 45 feet
by 150 feet in horizontal dimensions and is 48" thick.
The base of the mat is to be at a depth
of 8 feet below the ground surface.
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 Fall '09
 BrentRosenblad
 Civil Engineering, Hydrology, Geotechnical Engineering, Aquifer

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