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11-29. A silty sand is tested consolidated-drained in a triaxial cell where both principał stresses at the start of the test were 500 kPa. If the total axial stress at failure is l1.63 MPa while the horizontal pressure remains constant, compute the angle of shearing resistance and the theoretical orientation of the failure plane with respect to the horizontal. %3D 11-30. The silty sand of Problem 11-29 was inadvertently tested consoli- dated-undrained, but the laboratory technician noticed that the pore pressure at failure was 290 kPa. What was the principal stress difference at failure?

11-29. A silty sand is tested consolidated-drained in a triaxial cell where both principał stresses at the start of the test were 500 kPa. If the total axial stress at failure is l1.63 MPa while the horizontal pressure remains constant, compute the angle of shearing resistance and the theoretical orientation of the failure plane with respect to the horizontal. %3D 11-30. The silty sand of Problem 11-29 was inadvertently tested consoli- dated-undrained, but the laboratory technician noticed that the pore pressure at failure was 290 kPa. What was the principal stress difference at failure?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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solve the problem 11-29 as shown in the figure.

11-29. A silty sand is tested consolidated-drained in a triaxial cell where both principal stresses at the start of the test were 500 kPa. If the total axial stress at failure is 1.63 MPa while the horizontal pressure remains constant, compute the angle of shearing resistance and the theoretical orientation of the failure plane with respect to the horizontal. 11-30. The silty sand of Problem 11-29 was inadvertently tested consoli- dated-undrained, but the laboratory technician noticed that the pore pressure at failure was 290 kPa. What was the principal stress difference at failure? 11-31, If the consolidation pressure in the CU test of Problem 11-30 were 1000 kPa instead of 500 kPa, estimate the pore pressure at failure, 11-32. A sample of sand failed when (o, - o3) was 900 kPa. It the hydrostatic consolidation stress were 300 kPa, compute the angle of shearing resistance of the sand. What else can you say about the sand? 11-33. If the sample of Problem 11-32 were sheared undrained and the induced pore pressure at failure were 200 kPa, estimate the prin- cipal stress difference at failure. What would be the angle of shearing resistance in terms of total stresses? 11-34. A sample of sand at the field density is known to have a (0,/03)max of 4.0. If such a specimen is hydrostatically consolidated to 1210 kPa in a triaxial test apparatus, at what effective confining pres- sure aj, will the sample fail if the vertical stress is held constant? (This is. a lateral.extension test.)
Transcribed Image Text:11-29. A silty sand is tested consolidated-drained in a triaxial cell where both principal stresses at the start of the test were 500 kPa. If the total axial stress at failure is 1.63 MPa while the horizontal pressure remains constant, compute the angle of shearing resistance and the theoretical orientation of the failure plane with respect to the horizontal. 11-30. The silty sand of Problem 11-29 was inadvertently tested consoli- dated-undrained, but the laboratory technician noticed that the pore pressure at failure was 290 kPa. What was the principal stress difference at failure? 11-31, If the consolidation pressure in the CU test of Problem 11-30 were 1000 kPa instead of 500 kPa, estimate the pore pressure at failure, 11-32. A sample of sand failed when (o, - o3) was 900 kPa. It the hydrostatic consolidation stress were 300 kPa, compute the angle of shearing resistance of the sand. What else can you say about the sand? 11-33. If the sample of Problem 11-32 were sheared undrained and the induced pore pressure at failure were 200 kPa, estimate the prin- cipal stress difference at failure. What would be the angle of shearing resistance in terms of total stresses? 11-34. A sample of sand at the field density is known to have a (0,/03)max of 4.0. If such a specimen is hydrostatically consolidated to 1210 kPa in a triaxial test apparatus, at what effective confining pres- sure aj, will the sample fail if the vertical stress is held constant? (This is. a lateral.extension test.)
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