Engineering, 24.09.2021 14:00 uehlingt39
A highway overpass abutment weighing 2800 kN is proposed to be supported by a 4 m
wide square footing sitting 0.5 m below grade on layered clay soil. The top layer of clay
extends from the ground surface to a depth of 1.5 m. Extensive soil sampling and
laboratory testing via unconfined compression tests indicate that the top clay layer has an
unconfined compressive strength of 240 kN/m2 and a unit weight of 16.8 kN/m3, and the
bottom layer has an unconfined compressive strength of 96 kN/m2 and a unit weight of
16.2 kN/m3
. Use the Army Corps of Engineers method (Also known as the adjusted bearing
capacity factors method, using the equations developed for clays using the provided chart
and table with a F. S =3) to determine whether or not this proposed footing design is
sufficient to support the design load. (Hint: the undrained shear strength is half of the
unconfined compressive strength,
Answers: 1
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A highway overpass abutment weighing 2800 kN is proposed to be supported by a 4 m
wide square foo...
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