###A series of saturated and unsaturated triaxial
tests were conducted on a sand-clay mixture. Results are shown in
table below. Assume that the cohesion is zero and determine the
internal friction angle , effective stress parameters at different
values of suction and determine the air entry value
****Problem 4 A newly drilled well in a carbonate reservoir
indicates a gross payzone thickness of 150 feet. The foot by foot
porosity values vary all the way from .04 to 0.16. If...
A new, wide highway embankment is planned across a relatively
recent deposit of doubly-drained, saturated clay soil with cv =
5E-8 m2/sec. The settlement analysis of the 10 m thick clay layer
yielded an estimated consolidation settlement of 800 mm for the new
embankment loading. Determine and plot the settlement of the clay
layer (as measured at the ground surface) at 0, 0.49, 3.12, 6.39,
13.44, and 18.44 years.
A clay layer in field is 3-m thick and is sandwiched between two
sand layers (drained from top and bottom). The saturated stratum of
clay is under a surcharge loading and underwent 90% primary
consolidation in 75 days. The time required in minutes for a 30 mm
thick undisturbed clay sample obtained from the field to undergo
90% consolidation in laboratory is most nearly equal to
Select one:
a. 28
b. 67.5
c. 100
d. 10
Two triaxial tests are performed on a clay. At failure, the
results are:
Test 1: σ3 = 30 kPa, P = 0.45 kN, A = 0.01
m2, u = 10 kPa
Test 2: σ3 = 60 kPa, P = 0.70 kN, A = 0.01
m2, u = 20 kPa
Find σ1, σ3, σ'1, and
σ'3 at failure for both tests.
Draw the effective stress Mohr's circle for both tests and draw
the Mohr-Coulomb failure envelope for the clay. What are...
A series of consolidated, undrained triaxial tests were carried
out on specimens of a saturated clay under no back pressure. The
test data at failure are summarized:
Confining pressure
kPa Deviator
stress kPa Pore water pressure kpa
150
192
80
300
341
154
450
504
222
Draw the mohr circles and find the cohesion and friction angle
in terms of effective stresses.
Compute Skempton’s A-Parameter at failure for all three
specimens
Is the soil normally consolidated or overconsolidated?
Why?
Another...
Q.3) USE ONLY GRAPHICAL METHOD: A consolidated-drained triaxial
test was conducted on a normally consolidated clay with a chamber
pressure, σ3 = 172 kN/m2 . The deviator stress at failure, (Δσd)f =
227 kN/m2 . Determine (12 points): a. The angle of friction, φ' b.
The angle θ that the failure plane makes with the major principal
plane c. The normal stress, σf', and the shear stress, τf, on the
failure plane
two cylindrical specimens A and B of a soil were
loaded as follows. Both specimen were isotropically loaded by a
stress of 200 kpa under drained conditions. Subsequently, the
radial stress applied on specimen A was held constant and the axial
stress was incrementally increased to 440 kpa under undrained
conditions. The axial stress on specimen B was held constant and
the radial stress was incrementally reduced to 50 kpa under drained
conditions. plot the total and effective stress paths...
The results of a two-way ANOVA using the accompanying data and
hypothesis tests for interaction between Factor A and Factor B and
for each factor are provided below. Using these data and results,
determine which means are different using α= 0.01when
warranted.
Factor A
FactorB
Level 1
Level 2
Level 3
Level 1
66
88
1010
77
1212
3232
1010
1919
3030
Level 2
2828
3030
3030
1111
2020
3838
1616
2020
3939
Level 3
3535
4040
4242
3131
2929...
There are two types of COVID-19 tests: the first one with lower
sensitivity and higher speed(results can be available in very few
hours) and the second one with higher sensitivity and lower
speed(results need a long time to be available). If we have two
countries: one with a high number of infected people and one with a
low number of infected people, which test would you recommend using
in each country, and why?
Listed below are the results from two different tests designed
to measure achievement.
(x) test A
64
48
51
59
60
43
41
42
35
50
45
(y) test B
91
68
80
92
91
67
65
67
56
78
71
a. Plot the scatter diagram below. Label X and y axes. Do a
rough sketch.
b. Find the value of the linear correlation coefficient r by the
TI83 shortcut- state calculator screen name.
C. Test the claim of no...