SITUATION: A 12 ftx 10 ft footing carries a total load of 300 tons. Standard penetration test was conducted on the site. Test results were corrected for over burden pressure and corrected N-values are listed as shown. Determine the maximum settiement if the ground water table and base of the foundation are 7 ft and 4 ft below the ground surface respectively. Assume the dry and saturate unit weight of the sand are 115 pcf and 124 pcf respectively. Settlements of Loads on Sand (SPT) 29 Sma= Nwt 28 maximum settlement on dry sand in inches 1+B 28 29 Nwt )if the ground water table is located at a depth below the Smax =Xa base of the footing less than the half the footings width (B/2). Xa = PP.
SITUATION: A 12 ftx 10 ft footing carries a total load of 300 tons. Standard penetration test was conducted on the site. Test results were corrected for over burden pressure and corrected N-values are listed as shown. Determine the maximum settiement if the ground water table and base of the foundation are 7 ft and 4 ft below the ground surface respectively. Assume the dry and saturate unit weight of the sand are 115 pcf and 124 pcf respectively. Settlements of Loads on Sand (SPT) 29 Sma= Nwt 28 maximum settlement on dry sand in inches 1+B 28 29 Nwt )if the ground water table is located at a depth below the Smax =Xa base of the footing less than the half the footings width (B/2). Xa = PP.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:SITUATION: A 12 ft x 10 ft footing carries a total load of 300 tons. Standard penetration test
was conducted on the site. Test results were corrected for over burden pressure and
corrected N-values are listed as shown.
Determine the maximum settlement if the ground water table and base of the foundation are 7
ft and 4 ft below the ground surface respectively. Assume the dry and saturate unit weight of
the sand are 115 pcf and 124 pcf respectively.
Settlements of Loads on Sand (SPT)
29
Smas=
28
maximum settlement on dry sand in inches
Nowest
1+B.
24
Njowest
28
Smax =Xa
if the ground water table is located at a depth below the
base of the footing less than the half the footings width (B/2).
Xa = PP.
Pa= effective overburden pressure at a depth B/2 below the footings base, assuming
the water table is not present
P. = effective overburden pressure at the same depth with water table present
q= applied pressure in tons/t?
B = in feet
Depth (m)
Corrected N-values
4.0
40
60
42
80
44
100
36
120
39
14.0
36
16.0
36
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