For the soil profile shown, calculate the settlement on the clay layer due to primary consolidation if the footing carries a net pressure equal 200 kN/m2 on its bottom. A sample of the clay was subjected to Atterberg Limit tests and yielded a water content of 39.706% at 25 blows in the liquid limit device. (0.134 m)
For the soil profile shown, calculate the settlement on the clay layer due to primary consolidation if the footing carries a net pressure equal 200 kN/m2 on its bottom. A sample of the clay was subjected to Atterberg Limit tests and yielded a water content of 39.706% at 25 blows in the liquid limit device. (0.134 m)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Show solution. The answer must be 0.134m
Transcribed Image Text:For the soil profile shown, calculate the settlement on the clay layer due to primary
consolidation if the footing carries a net pressure equal 200 kN/m² on its bottom.
A sample of the clay was subjected to Atterberg Limit tests and yielded a water content of
39.706% at 25 blows in the liquid limit device. (0.134 m)
2 m X 3 m footing
2.0 m
200 KN/m2
SAND
2.1 m
e-0.52
2.0 m
GWT
..Z..G.?65.
0.8 m
CLAY
Cs = 1/6 Cc
e= 0.9
4.0 m
Gs-2.74
Pc 115 kPa
IMMEDIATE SETTLEMENT
pB 1-u²1,
E
Eq. 24
Si
%3D
where:
Si = immediate settlement p = net pressure applied
B = width of the foundation (diameter of a circular footing)
p = Poisson's ratio
E = Modulus of Elasticity of soil
Ip = non dimensional influence factor
Table 2. Influence Factors for foundations
Flexible
Shape
Center
Corner
Rigid
Circle
1.00
064
0,29
0.88
107
1.21
Rectangle
1.12
136
0.56
0.68
0.77
O.89
1.5
10
20
50
100
1.53
1.78
210
2.54
299
3.57
4.01
105
1.27
1.49
18
20
142
1.20
2.10
246
3.0
3.43
m, = length/width of foundation
TOTAL FOUNDATION SETTLEMENT
ST = S + Ss + Si→ Eq. 25
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