A specimen of normally consolidated clay was consolidated under a chamber confining pressure of 280kpa for a drained test by how much does the axial stress have to be reduced to cause failure by axial extension?
A specimen of normally consolidated clay was consolidated under a chamber confining pressure of 280kpa for a drained test by how much does the axial stress have to be reduced to cause failure by axial extension?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A specimen of normally consolidated clay was consolidated under a chamber confining pressure of 280kpa for a drained test by how much does the axial stress have to be reduced to cause failure by axial extension?
Transcribed Image Text:CHOPSTICKS
470 Shear strength of soils
Determine c and o. Also determine the magnitudes of the normal and shear stress
on the planes of failure for the two specimens used in the tests.
7.2
A specimen of normally consolidated clay ( = 28°) was consolidated under a
chamber-confining pressure of 280 kN/m². For a drained test, by how much does
the axial stress have to be reduced to cause failure by axial extension?
7.3 A normally consolidated clay specimen ( = 31°) was consolidated under a
chamber-confining pressure of 132 kN/m². Failure of the specimen was caused by
an added axial stress of 158.1 kN/m² in an undrained condition. Determine &cu, Af,
and the pore water pressure in the specimen at failure.
7.4 A normally consolidated clay is consolidated under a triaxial chamber con-
fining pressure of 495 kN/m² and = 29°. In a Rendulic-type diagram, draw the
stress path the specimen would follow if sheared to failure in a drained condition
in the following ways: b
(a) By increasing the axial stress and keeping the radial stress constant.
(b) By reducing the axial stress and keeping the axial stress constant.
(c) By increasing the axial stress and keeping the radial stress such that o₂ +
2o = const.
(d) By reducing the axial stress and keeping the radial stress constant.
(e) By increasing the radial stress and keeping the axial stress constant.
(By reducing the axial stress and increasing the radial stress such that
o+20 =const.
7.5 The results of a consolidated undrained test, in which o3 = 392 kN/m², on a
normally consolidated clay are given next:
Axial strain (%) Ao(kN/m²) u (kN/m²)
0
0
0.5
99
0.75
120
|
132
1.3
147
161
170
173
175
2
3
4
45
0
156
196
226
235
250
245
240
235
01
(000,005)
008
000
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