A 10 m thick clay layer overlying an impermeable rock is consolidated under an overburden pressure of 500 kPa. Because of a contemplated construction, pressure increase of 300 kPa is expected. Consolidation tests on an undisturbed specimen from the field indicate that, for o1-200 kPa, e1=0.92 and for o2=300 kPa, e2=0.88. If the permeability of the clay layer is k=1.2x10-6 cm/sec, a) Calculate the total settlement? b) What is the probable period for reaching a consolidation ratio of 60% ? Assume constant initial pore water pressure distribution.
A 10 m thick clay layer overlying an impermeable rock is consolidated under an overburden pressure of 500 kPa. Because of a contemplated construction, pressure increase of 300 kPa is expected. Consolidation tests on an undisturbed specimen from the field indicate that, for o1-200 kPa, e1=0.92 and for o2=300 kPa, e2=0.88. If the permeability of the clay layer is k=1.2x10-6 cm/sec, a) Calculate the total settlement? b) What is the probable period for reaching a consolidation ratio of 60% ? Assume constant initial pore water pressure distribution.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Consolidation problem
![A 10 m thick clay layer overlying an impermeable rock is consolidated under an overburden pressure
of 500 kPa. Because of a contemplated construction, pressure increase of 300 kPa is expected.
Consolidation tests on an undisturbed specimen from the field indicate that, for o1=200 kPa, e1=0.92
and for 02-300 kPa, e2=0.88. If the permeability of the clay layer is k-1.2x10-6 cm/sec,
a) Calculate the total settlement?
b) What is the probable period for reaching a consolidation ratio of 60% ? Assume constant initial
pore water pressure distribution.
INZI
Curve (1)
(a) Open layers
Curve (1)
Curve (1)
Curve (1)
Z]
Curve (3)
Curve (2)
(b) Half-closed layers
Figure 7.19 Initial variations of excess pore water pressure.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72b8ce88-847f-4f53-aad5-cdd82e3adb7c%2F537ff8be-7104-4eb6-a671-3baad0f22772%2Ftovyi6h_processed.png&w=3840&q=75)
Transcribed Image Text:A 10 m thick clay layer overlying an impermeable rock is consolidated under an overburden pressure
of 500 kPa. Because of a contemplated construction, pressure increase of 300 kPa is expected.
Consolidation tests on an undisturbed specimen from the field indicate that, for o1=200 kPa, e1=0.92
and for 02-300 kPa, e2=0.88. If the permeability of the clay layer is k-1.2x10-6 cm/sec,
a) Calculate the total settlement?
b) What is the probable period for reaching a consolidation ratio of 60% ? Assume constant initial
pore water pressure distribution.
INZI
Curve (1)
(a) Open layers
Curve (1)
Curve (1)
Curve (1)
Z]
Curve (3)
Curve (2)
(b) Half-closed layers
Figure 7.19 Initial variations of excess pore water pressure.
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