Question

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/ft^{2}. Due to the presence of a
large water tank on the surface, the stress is increased by 710
lbs/ft^{2} 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, Swell index = .05,
initial void ratio = 1.125, consolidation coefficient = 0.02
in^{2}/min, preconsolidation pressure = 4500
lb/ft^{2}.

Answer #1

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...

A 10 m layer of sand overlies a 6 m layer of saturated clay,
below which there is impermeable rock. For the clay, cv = 4.4
m2/yr. The ultimate consolidation settlement for a given surface
loading was determined to be sc = 18 cm.
a) How long will it take for 95% of the consolidation settlement
to be completed?
b) What will be the magnitude of settlement 1 year after the
load is applied?
c) How long will it take...

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.

At a reclamation site, a 6-m thick sand layer overlies a 5.8-m
thick clay layer, which is underlain by impermeable rock stratum.
The water level is initially 2.5 m above the ground surface. The
saturated unit weights of sand and clay are 19 kN/m3 and 17 kN/m3,
respectively. A 5-m thick layer of fill will be placed on the
original ground surface, and the unit weights of fill are 19 kN/m3
and 20 kN/m3 above and below water table, respectively....

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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