9. Problem: From the given soil profile shown, the ground surface is subjected to a uniform increase in vertical pressure AP = 10 T/m2. Dry Unit weight of sand is 1.77 T/m and a saturated unit weight of 2.05 T/m3. The 10 m. layer of sand overlies a 3 m. layer of clay which has a liquid limit of 40%, a water content of 42% with a sp.gr. of 2.76. Ground water table is located 4 m. below the ground surface. AP=10 T/m2 Sand 4 m Yary 1.77 T/m² Nater table Sand Yrar-2.05 T/m2 6 m 1.5 m LL-46% Clay 0-42% Po 3 m Gs=2.76 a) Compute the effective unit weight of clay. b) Compute the overburden pressure at the mid point of the clay. 9 Compute the primary consolidation settlement.

Structural Analysis
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Chapter2: Loads On Structures
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Answer question 9 only

Answers:

a) 0.82 Tons/m3

b) 14.61 Tons/m2

c) 10.195 cm

Problem:
10 Problem
nsion o
5000 kN
From the
of sand
ter table
се.
From the given soil profile shown, the ground
surface is subjected to a uniform increase in
vertical pressure AP = 10 T/m2. Dry Unit
weight of sand is 1.77 T/m and a saturated
unit weight of 2.05 T/m3. The 10 m. layer of
sand overlies a 3 m. layer of clay which has a
liquid limit of 40%, a water content of 42% with
a sp.gr. of 2.76. Ground water table is located
4 m. below the ground surface.
A 10 ft x 10 ft. footing carries
280 tons is shown on the figu
penetration tests were. conduct
Test results were corrected fa
%3D
pressure and the corrected N-va
as shown.
Depth (ft)
Corrected
Vm3
5.0
7.5
10.0
AP=10 T/m2
12.5
15.0
3.
Sand
4 m
Ydry=1.77 T/m2
17.5
water table
20.0
31
face
Sand
Ysar-2.05 T/m2
280 tons
6 m
N/m3
Groune
und
er table
LL-46%
15m
Clay
3 m
W=42%
Po
Sand
Gs=2.76
a) Compute the effective unit weight of clay.
b) Compute the overburden pressure at the
mid point of the clay.
10x 10
9 Compute the primary consolidation
settlement.
e vertical
ure at the
a) Compute the lowest average
N-value for design.
solidation
b) Compute the max. expected
for this footing in inches.
c) Compute the max. expected
for this footing if the ground wa
located 7 ft. below the ground
unit weight is 124 pcf., assume
unit weight of sand is 124 pcf.
Transcribed Image Text:Problem: 10 Problem nsion o 5000 kN From the of sand ter table се. From the given soil profile shown, the ground surface is subjected to a uniform increase in vertical pressure AP = 10 T/m2. Dry Unit weight of sand is 1.77 T/m and a saturated unit weight of 2.05 T/m3. The 10 m. layer of sand overlies a 3 m. layer of clay which has a liquid limit of 40%, a water content of 42% with a sp.gr. of 2.76. Ground water table is located 4 m. below the ground surface. A 10 ft x 10 ft. footing carries 280 tons is shown on the figu penetration tests were. conduct Test results were corrected fa %3D pressure and the corrected N-va as shown. Depth (ft) Corrected Vm3 5.0 7.5 10.0 AP=10 T/m2 12.5 15.0 3. Sand 4 m Ydry=1.77 T/m2 17.5 water table 20.0 31 face Sand Ysar-2.05 T/m2 280 tons 6 m N/m3 Groune und er table LL-46% 15m Clay 3 m W=42% Po Sand Gs=2.76 a) Compute the effective unit weight of clay. b) Compute the overburden pressure at the mid point of the clay. 10x 10 9 Compute the primary consolidation settlement. e vertical ure at the a) Compute the lowest average N-value for design. solidation b) Compute the max. expected for this footing in inches. c) Compute the max. expected for this footing if the ground wa located 7 ft. below the ground unit weight is 124 pcf., assume unit weight of sand is 124 pcf.
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