Q1 Data obtained from a laboratory consolidation test are tabulated as follows: Test points 2 3 4 5 6 o' (kPa) Total AH (mm) 20 50 100 200 400 800 0.23 0.87 1.90 3.62 5.55 7.25 G,=2.70, Ho= (initial thickness at zero pressure) 22.5 mm, w = (moisture content at the beginning of the test) 0.78. Plot the e-logo' curve and calculate Ce.
Q1 Data obtained from a laboratory consolidation test are tabulated as follows: Test points 2 3 4 5 6 o' (kPa) Total AH (mm) 20 50 100 200 400 800 0.23 0.87 1.90 3.62 5.55 7.25 G,=2.70, Ho= (initial thickness at zero pressure) 22.5 mm, w = (moisture content at the beginning of the test) 0.78. Plot the e-logo' curve and calculate Ce.
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 11.15P
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![SOIL MECHANICS – HOMEWORK PART-3
Q1
Data obtained from a laboratory consolidation test are tabulated as follows:
Test points
3
4
5
o' (kPa)
Total AH (mm)
20
50
100
200
400
800
0.23
0.87
1.90
3.62
5.55
7.25
G=2.70, Họ= (initial thickness at zero pressure) = 22.5 mm,
w = (moisture content at the beginning of the test) = 0.78.
Plot the e-logo curve and calculate Ce.
Ae
C. =
log a¡ – logo, log(oʻ /o,)
Ho
AH
Hint:
and
Q2
An open layer of clay 4 m thick is subjected to loading that incereases the average effective
vertical stress from 185 kPa to 310 kPa. Determine:
(a) the total settlement,
my = 0.00025 m“/kN, cy = 0.75 m²
AH / Ho
m, =
Ae/(l + €g)
or m, =
(6.4)
From this definition we can find the consolidation settlement for a layer of thickness H:
Hint:
S̟ = AH = m,H(o¡ -6)
(6.5)
Q4
A surface load of 60 kPa is applied on the ground surface over a large area. The soil
profile consists of a sand layer 2 m thick, the top of which is the ground surface, overlying
a 4 m thick layer of clay. An impermeable boundary is located at the base of the clay
layer. The water table is 1 m below the ground surface. If the preconsolidation pressure
for a sample of soil from the mid-point of the clay layer is 60 kPa, calculate the
consolidation sețtlement of the clay layer. The properties of the soil section are: sand:
Pdry = 1.6 Mg/m³, Psar = 1.9 Mg/m³, clay: psar = 1.65 Mg/m°, eo = 1.5, Cc = 0.6, C, = 0.1.
Hint: Ppc= [Ho/(1+einit)]x[C,log(p'/oʻinit) + Celog(ơʻfin/pʻ.)]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc8780c09-b587-4a3e-83bb-39b050dea70e%2Fcbe1edd4-1196-4f5c-bc91-88f381eeed8e%2Flusn5cj_processed.jpeg&w=3840&q=75)
Transcribed Image Text:SOIL MECHANICS – HOMEWORK PART-3
Q1
Data obtained from a laboratory consolidation test are tabulated as follows:
Test points
3
4
5
o' (kPa)
Total AH (mm)
20
50
100
200
400
800
0.23
0.87
1.90
3.62
5.55
7.25
G=2.70, Họ= (initial thickness at zero pressure) = 22.5 mm,
w = (moisture content at the beginning of the test) = 0.78.
Plot the e-logo curve and calculate Ce.
Ae
C. =
log a¡ – logo, log(oʻ /o,)
Ho
AH
Hint:
and
Q2
An open layer of clay 4 m thick is subjected to loading that incereases the average effective
vertical stress from 185 kPa to 310 kPa. Determine:
(a) the total settlement,
my = 0.00025 m“/kN, cy = 0.75 m²
AH / Ho
m, =
Ae/(l + €g)
or m, =
(6.4)
From this definition we can find the consolidation settlement for a layer of thickness H:
Hint:
S̟ = AH = m,H(o¡ -6)
(6.5)
Q4
A surface load of 60 kPa is applied on the ground surface over a large area. The soil
profile consists of a sand layer 2 m thick, the top of which is the ground surface, overlying
a 4 m thick layer of clay. An impermeable boundary is located at the base of the clay
layer. The water table is 1 m below the ground surface. If the preconsolidation pressure
for a sample of soil from the mid-point of the clay layer is 60 kPa, calculate the
consolidation sețtlement of the clay layer. The properties of the soil section are: sand:
Pdry = 1.6 Mg/m³, Psar = 1.9 Mg/m³, clay: psar = 1.65 Mg/m°, eo = 1.5, Cc = 0.6, C, = 0.1.
Hint: Ppc= [Ho/(1+einit)]x[C,log(p'/oʻinit) + Celog(ơʻfin/pʻ.)]
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