Question

Consider a clay layer that is 1 m thick. The clay has a compression index of 0.35, a swell index of 0.07, a permeability of 4 x 10-7 cm/sec, a preconsolidation pressure of 172 kPa and a coefficient of consolidation of 2.7 x 10-4 cm2/min. The initial effective stress at the midpoint of the layer is 140 kPa, and the soil has a void ratio of 1.01. The stress is increased to 200 kPa. The soil is drained above and below. The total primary consolidation expected is 4.40 cm.

a) How much time in days is required for 2.0 cm of primary
settlement to occur?

b) What percentage of consolidation will have occurred after 1
year?

Answer #1

Consider a 20 foot thick saturated clay that has a sand layer
above it and an impermeable rock layer below it. The clay layer has
an initial effective stress at its midpoint of 3145
lbs/ft2. Due to the presence of a
large water tank on the surface, the stress is increased by 710
lbs/ft2 at the midpoint of the clay layer. How much
total settlement from primary consolidation is expected? Provide
your answer in inches.
Soil properties: Compression index = .324,...

A 10-ft-thick silty clay layer is subjected to a load that
results in total primary consolidation settlement of 0.85 inches.
The clay is sandwiched between two sand layers and has an initial
void ratio of 0.76, a coefficient of compression of 0.45, a
coefficient of recompression of 0.07 and a coefficient of
consolidation of 0.034 in2 /year. Calculate the settlement at the
end of 2 years and determine the time in days for 0.60 inches of
settlement.

A 10-ft-thick silty clay layer is subjected to a load that
results in total primary consolidation settlement of 0.85 inches.
The clay is sandwiched between two sand layers and has an initial
void ratio of 0.76, a coefficient of compression of 0.45, a
coefficient of recompression of 0.07 and a coefficient of
consolidation of 0.034 in2/year. Calculate the settlement at the
end of 2 years and determine the time in days for 0.60 inches of
settlement.

The ultimate consolidation of a 13-ft thick single-drained clay
layer (cv = 0.1 ft2/day) was calculated to be
0.813 feet.
a. What is the average degree of consolidation for the clay
layer when the settlement is 2 inches?
b. If the average value for cv for the pressure range is 0.003
cm2/second how long will it take for 50% settlement to
occur? (be careful on the units)
c. If the 17 ft clay layer is drained on one side, how...

A layer of clay, 4 meters thick will settle a total of 57 mm
under a new applied load. Determine how much settlement will occur
within the first year if the coefficient of consolidation is 0.07
cm2/min and the soil can only drain from the top.
Provide your answer in millimeters as a whole number.

The net stress increase due to a building at the middle of a 6
ft normally consolidated clay layer is 400 psf. The compression
index of the soil is 0.6 and its void ratio is 1.3. If the primary
consolidation settlement is 2.34 inch, the initial effective
consolidation stress (psf) is most nearly equal to
a) 1400 b) 1200 c) 1000 d) 1600
Please show all steps

Using the data in Textbook Problem 8.8:
a. Plot the vertical effective consolidation stress versus void
ratio on both arithmetic and semi-log graphs. For the arithmetic
graph, constrain the vertical axes to 0.55 and 0.95; and the
horizontal to 0 to 1,500 kPa; for the semi-log graph, use the same
vertical axis constraints, but use 10 kPa and 10,000 kPa to ease
interpretation. Plot the data points only, and draw in a smooth
curve by hand. Plot each graph on...

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