Example 9.3: Figure 9.30 represents the average soil profile obtained from boreholes, at ground water table is at a depth of 3.5 m. It is estimated that the additional stress on the the site of a proposed building whose foundation is to be placed at a depth of 2.5 m. The clay layer due to the weight of the building will be 150 kN/m² at the top of the clay and 70 kN/m² at the bottom of the clay. Following results were obtained from consolidation tests: Applied stress (kN/m²) 50 Void ratio 0.882 Unit weights: sand above water table clay-19.5 kN/m³. Determine the settlement of the clay layer. El.0 m A AI -2.5 m -3.5 m -5.5 m W.T.V -11.5 m - BOS 25 0.890 008 100 Building 800 0.865 0.830 0.798 0.765 19.0 kN/m³; saturated sand - 21.0 kN/m³; Rock stratum Soil profile TIK TIK Sand 200 Clay 10 400 Y₁ = 19.0 kN/m³ Ysat = 21.0 kN/m³ Ysat = 19.5 kN/m³ TIRTIN

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Soil mechanics solution please
= 0.136 m
S can also be calculated from the equation
Boldos S=m, AH,
= 0.81 x 0.25 x 3.0
= 0.135 m
Example 9.3: Figure 9.30 represents the average soil profile obtained from boreholes, at
the site of a proposed building whose foundation is to be placed at a depth of 2.5 m. The
ground water table is at a depth of 3.5 m. It is estimated that the additional stress on the
clay layer due to the weight of the building will be 150 kN/m² at the top of the clay and
70 kN/m² at the bottom of the clay. Following results were obtained from consolidation
tests:
1+ eo
3.0x0.10
1+1.20
Applied stress (kN/m²)
25
Void ratio
0.890
0.882
0.865
0.830
0.798
Unit weights: sand above water table - 19.0 kN/m³; saturated sand - 21.0 kN/m³;
clay- 19.5 kN/m³.
Determine the settlement of the clay layer.
El.0 mA IIN
-2.5 m
-3.5 m
-5.5 m
-11.5 m
W.T.V
50
Building
100
Sand
TIK TIK
Clay
TIK TIK
Rock stratum
Soil profile
Fig. 9.30 Example 9.3
200
400
Y₁ = 19.0 kN/m³
Ysat = 21.0 kN/m³
08:0
Ysat = 19.5 kN/m³
TIK TIK
800
0.765
Transcribed Image Text:= 0.136 m S can also be calculated from the equation Boldos S=m, AH, = 0.81 x 0.25 x 3.0 = 0.135 m Example 9.3: Figure 9.30 represents the average soil profile obtained from boreholes, at the site of a proposed building whose foundation is to be placed at a depth of 2.5 m. The ground water table is at a depth of 3.5 m. It is estimated that the additional stress on the clay layer due to the weight of the building will be 150 kN/m² at the top of the clay and 70 kN/m² at the bottom of the clay. Following results were obtained from consolidation tests: 1+ eo 3.0x0.10 1+1.20 Applied stress (kN/m²) 25 Void ratio 0.890 0.882 0.865 0.830 0.798 Unit weights: sand above water table - 19.0 kN/m³; saturated sand - 21.0 kN/m³; clay- 19.5 kN/m³. Determine the settlement of the clay layer. El.0 mA IIN -2.5 m -3.5 m -5.5 m -11.5 m W.T.V 50 Building 100 Sand TIK TIK Clay TIK TIK Rock stratum Soil profile Fig. 9.30 Example 9.3 200 400 Y₁ = 19.0 kN/m³ Ysat = 21.0 kN/m³ 08:0 Ysat = 19.5 kN/m³ TIK TIK 800 0.765
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