9. A 4.5 m saturated clay layer (two-way drainage) subjected to surcharge loading underwent 90% primary consolidation in 180 days. a) Find the coefficient of consolidation of the clay for the pressure range. b) How long will it take for a 19-mm-thick clay specimen to undergo 65% coefficient of consolidation of the clay for the pressure range. c) How long will it take for a 19-mm-thick clay specimen to undergo 65% consolidation in a laboratory test?
9. A 4.5 m saturated clay layer (two-way drainage) subjected to surcharge loading underwent 90% primary consolidation in 180 days. a) Find the coefficient of consolidation of the clay for the pressure range. b) How long will it take for a 19-mm-thick clay specimen to undergo 65% coefficient of consolidation of the clay for the pressure range. c) How long will it take for a 19-mm-thick clay specimen to undergo 65% consolidation in a laboratory test?
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter11: Compressibility Of Soil
Section: Chapter Questions
Problem 11.16P
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Transcribed Image Text:9. A 4.5 m saturated clay layer (two-way drainage) subjected to surcharge loading underwent
90% primary consolidation in 180 days.
a) Find the coefficient of consolidation of the clay for the pressure range.
b) How long will it take for a 19-mm-thick clay specimen to undergo 65% coefficient of
consolidation of the clay for the pressure range.
c) How long will it take for a 19-mm-thick clay specimen to undergo 65% consolidation in a
laboratory test?
10. Refer to the figure on the right.
A square footing, 2 x 2 m in size,
Supports a column load of 300
kN. The soil characteristics are
given lin the figure. Field moni-
toring indicated that the found-
ation settlement was 19 mm
during the first 12 months.
a) Estimate the average stress
increase in the clay layer due
to the applied load.
b) Estimate the primary conso-
lidation settlement.
c) What is the degree of conso-
lidation after 10 months?
d)
Estimate the coefficient of
consolidation for the pressure
1m
m
2 m
range.
e) Estimate the settlemer Page 3 / 3
24 months.
2m x 2m
300 kN
↓
QSa+Clay
7-14kN/m³
You = 17 kN/m³
-24%
-2.74
LL = 46
40 kN/m²
C₁ = 1/5C,
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