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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?

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?

Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter12: Shear Strength Of Soil
Section: Chapter Questions
Problem 12.20P
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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?

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
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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