Solve the following problems using the figure. 1. Calculate the ultimate settlement of the clay layer. 2. Calculate the excess pore pressure (ue) and the effective stress at the midpoint of the clay layer after 3 years. 10' Fill, y = 118b/³ V Sand, y 109 lb/ft³ Sand, Ysat 114 lb/ft³ C = 0.25 eo 1.1 C₁ = 7 ft²/yr C₁ = 0.06 clay 14' N.C Ysat = 122 lb/ft³ sand 3. Create a plot (or plots) in a spreadsheet showing the hydrostatic pressure in the clay with depth and the excess pore pressure (ue) with depth after 3 years and the combined pore pressure after 3 years. (This is similar to an example worked in class) 4. Calculate the average percentage of consolidation (U%) for the clay layer after 3 years. 5. How long will it take for 80% of the ultimate settlement of the clay layer to take place?
Solve the following problems using the figure. 1. Calculate the ultimate settlement of the clay layer. 2. Calculate the excess pore pressure (ue) and the effective stress at the midpoint of the clay layer after 3 years. 10' Fill, y = 118b/³ V Sand, y 109 lb/ft³ Sand, Ysat 114 lb/ft³ C = 0.25 eo 1.1 C₁ = 7 ft²/yr C₁ = 0.06 clay 14' N.C Ysat = 122 lb/ft³ sand 3. Create a plot (or plots) in a spreadsheet showing the hydrostatic pressure in the clay with depth and the excess pore pressure (ue) with depth after 3 years and the combined pore pressure after 3 years. (This is similar to an example worked in class) 4. Calculate the average percentage of consolidation (U%) for the clay layer after 3 years. 5. How long will it take for 80% of the ultimate settlement of the clay layer to take place?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Solve the following problems using the figure.
1. Calculate the ultimate settlement of the clay layer.
2. Calculate the excess pore pressure (ue) and the
effective stress at the midpoint of the clay layer
after 3 years.
10'
Fill, y = 118b/³
Sand, y 109 lb/ft³
Sand, Ysat 114 lb/ft³
eo = 1.1
Cc = 0.25
C₁ = 7 ft²/yr
C₁ = 0.06
clay
14'
N.C
Ysat = 122 lb/ft³
sand
8.
For the previous problem, report the predicted settlement after 365 days.
3. Create a plot (or plots) in a spreadsheet showing
the hydrostatic pressure in the clay with depth and the excess pore pressure (ue) with
depth after 3 years and the combined pore pressure after 3 years. (This is similar to an
example worked in class)
4.
Calculate the average percentage of consolidation (U%) for the clay layer after 3 years.
5. How long will it take for 80% of the ultimate settlement of the clay layer to take place?
6. Assume thin layers of drainable sand are present every two feet within the clay so it is
actually five clay layers that are each two feet thick. How long will it take for 80% of the
ultimate settlement of the entire clay to take place?
7. Assume the original soil profile in the figure is present (no drainable sand seam from the
previous problem). Create a plot of settlement vs time up to 2000 days.
9. How long will it take for 90% of the ultimate settlement of the clay layer to take place if
the lower sand is actually a shale with negligible drainage?
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