In the soil profile shown below, the clay is normally consolidated and H,=9m, H2=5m, H3=3m. The depth of water table is then decreased so that H;=2m, H2=12m, H3=3m. a) Calculate the overconsolidation ratio (OCR) at this stage. When a surcharge of Ao = 180 kPa applied to the surface. b) Estimate the primary consolidation settlement of the clay layer. c) Estimate the degree of consolidation will be after 40 days? d) How many days would it take for 90% consolidation? Soil characteristics are as follows (use appropriate relations from the Appendix, 9.81 kN/m³): Yw = Sand: e = 0.56; Gs = 2.6 Clay: LL = 63; e = 0.83; G, = 2.77; C, =Cc; C, = 6.66 x 10-4cm² /s %3D Δσ H1 Sand Groundwater table Sand Н Clay. Void ratio = e H3 Normally consolidated Sand
In the soil profile shown below, the clay is normally consolidated and H,=9m, H2=5m, H3=3m. The depth of water table is then decreased so that H;=2m, H2=12m, H3=3m. a) Calculate the overconsolidation ratio (OCR) at this stage. When a surcharge of Ao = 180 kPa applied to the surface. b) Estimate the primary consolidation settlement of the clay layer. c) Estimate the degree of consolidation will be after 40 days? d) How many days would it take for 90% consolidation? Soil characteristics are as follows (use appropriate relations from the Appendix, 9.81 kN/m³): Yw = Sand: e = 0.56; Gs = 2.6 Clay: LL = 63; e = 0.83; G, = 2.77; C, =Cc; C, = 6.66 x 10-4cm² /s %3D Δσ H1 Sand Groundwater table Sand Н Clay. Void ratio = e H3 Normally consolidated Sand
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter11: Compressibility Of Soil
Section: Chapter Questions
Problem 11.15P
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Transcribed Image Text:In the soil profile shown below, the clay is normally consolidated and
H,=9m, H2=5m, H3=3m.
The depth of water table is then decreased so that
H;=2m, H2=12m, H3=3m.
a) Calculate the overconsolidation ratio (OCR) at this stage.
When a surcharge of Ao = 180 kPa applied to the surface.
b) Estimate the primary consolidation settlement of the clay layer.
c) Estimate the degree of consolidation will be after 40 days?
d) How many days would it take for 90% consolidation?
Soil characteristics are as follows (use appropriate relations from the Appendix,
9.81 kN/m³):
Yw =
Sand: e =
0.56; G, = 2.6
Clay: LL = 63; e = 0.83; G, = 2.77; C, = - Cc; Cy = 6.66 × 10-4cm² /s
%3D
Ao
H1
Sand
Groundwater table
Sand
H2
Clay.
Void ratio = e
H3
Normally consolidated
Sand
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