The figure shows a soil profile with a silty sand (y= 17 kN/m²; Ysat = 19.2 kN/m3) underlain by high plasticity clay (Ysat =18.8 kN/m³) and a peat layer (ysat =15 kN/m³), followed by dense sand. To expedite consolidation and minimize future settlement, an additional 1.75-m thick fill material, compacted to a unit weight of 20.1 kN/m³, will be placed on top of the silty sand layer. The fill load will be left in place for 18 months, after which construction will begin over the compacted fill. Fill load (kN/m?) ↑ ↑ ↑ ↑ 1.5 m Silty sand GWT 1.5 m 3.2 m 4 m Clay •A N Piezometer 1.8 m Peat Dense sand Undisturbed samples collected from the clay and organic Peat layers had the following properties: Layer C. C. c, (cm²/sec) Clay 0.31 0.048 0.006 1.08 Peat 7.2 0.273 0.029 6.4 • Are the layers singly or doubly drained? Explain. Estimate the time for 99% primary consolidation in each layer. Estimate the total consolidation settlement under the action of the fill load. Consider both the clay and peat layers to be normally consolidated.
The figure shows a soil profile with a silty sand (y= 17 kN/m²; Ysat = 19.2 kN/m3) underlain by high plasticity clay (Ysat =18.8 kN/m³) and a peat layer (ysat =15 kN/m³), followed by dense sand. To expedite consolidation and minimize future settlement, an additional 1.75-m thick fill material, compacted to a unit weight of 20.1 kN/m³, will be placed on top of the silty sand layer. The fill load will be left in place for 18 months, after which construction will begin over the compacted fill. Fill load (kN/m?) ↑ ↑ ↑ ↑ 1.5 m Silty sand GWT 1.5 m 3.2 m 4 m Clay •A N Piezometer 1.8 m Peat Dense sand Undisturbed samples collected from the clay and organic Peat layers had the following properties: Layer C. C. c, (cm²/sec) Clay 0.31 0.048 0.006 1.08 Peat 7.2 0.273 0.029 6.4 • Are the layers singly or doubly drained? Explain. Estimate the time for 99% primary consolidation in each layer. Estimate the total consolidation settlement under the action of the fill load. Consider both the clay and peat layers to be normally consolidated.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The figure shows a soil profile with a silty sand (y = 17 kN/m²; ysat = 19.2 kN/m3) underlain by
high plasticity clay (ysat =18.8 kN/m³) and a peat layer (Ysat =15 kN/m³), followed by dense sand.
To expedite consolidation and minimize future settlement, an additional 1.75-m thick fill
material, compacted to a unit weight of 20.1 kN/m³, will be placed on top of the silty sand layer.
The fill load will be left in place for 18 months, after which construction will begin over the
compacted fill.
Fill load (kN/m3)
1.5 m
Silty sand
GWT
1.5 m
3.2 m
4 m Clay
V •A NPiezometer
1.8 m Peat
Dense sand
Undisturbed samples collected from the clay and organic Peat layers had the following
properties:
Layer
C.
C.
c, (cm³/sec)
Clay
0.31
0.048
0.006
1.08
Peat
7.2
0.273
0.029
6.4
Are the layers singly or doubly drained? Explain.
Estimate the time for 99% primary consolidation in each layer.
Estimate the total consolidation settlement under the action of the fill load. Consider both
the clay and peat layers to be normally consolidated.
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