Assume that the compressible soil shown in Figure 1 consists of a clay layer 10 ft thick. A laboratory ocdometer test made on a sample from the center of the layer indicates the following: Initial void ratio, e, = 1.10, Saturated density, y= 115 Ib/f Existing overburden pressure p, = 0.7 tons/ft Pre-consolidation pressure, P. = 2.2 tons/ft? Laboratory compression index C, = 0.35 Swelling index C, = 0.06. Calculate the settlement of the surface of the upper incompressible layer due to the imposition of a uniform surcharge pressure of 5.0 tons/ft2. Uniform Vertical Surcharge Pressure

Structural Analysis
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Chapter2: Loads On Structures
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Geotechnical

Assume that the compressible soil shown in Figure 1 consists of a clay layer 10 ft thick. A laboratory oedometer test made on a sample
from the center of the layer indicates the following:
Initial void ratio, e, = 1.10,
Saturated density, Ynut = 115 lb/ft
Existing overburden pressure p, = 0.7 tons/ft?
Pre-consolidation pressure, P. = 2.2 tons/ft?
Laboratory compression index C. = 0.35
Swelling index C, = 0.06.
Calculate the settlement of the surface of the upper incompressible layer due to the imposition of a uniform surcharge pressure of 5.0
tons/ft2.
Uniform Vertical Surcharge Pressure
A666mip
Compressible Layer
Soconpres
Figure 1
P. = 0.7 Tsf
P= 2.2 Tsf
P+AP = 0.7+5=5.7 Tsf
1.5
1.4
1.3
1.2
11
0.9
0.8
0,7
0.6
0.5
0.42e,
0.4
0.3
0.2
0.1
0.1
10
100
Transcribed Image Text:Assume that the compressible soil shown in Figure 1 consists of a clay layer 10 ft thick. A laboratory oedometer test made on a sample from the center of the layer indicates the following: Initial void ratio, e, = 1.10, Saturated density, Ynut = 115 lb/ft Existing overburden pressure p, = 0.7 tons/ft? Pre-consolidation pressure, P. = 2.2 tons/ft? Laboratory compression index C. = 0.35 Swelling index C, = 0.06. Calculate the settlement of the surface of the upper incompressible layer due to the imposition of a uniform surcharge pressure of 5.0 tons/ft2. Uniform Vertical Surcharge Pressure A666mip Compressible Layer Soconpres Figure 1 P. = 0.7 Tsf P= 2.2 Tsf P+AP = 0.7+5=5.7 Tsf 1.5 1.4 1.3 1.2 11 0.9 0.8 0,7 0.6 0.5 0.42e, 0.4 0.3 0.2 0.1 0.1 10 100
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