Answered: While applying shear stress to a…

While applying shear stress to a saturated clay sample, the specimen experiences volume change in the form of dilation. Will this lead to negative or positive excess pore water pressure?

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 12.13P

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Introduction to Engineering Design

Students are often confused with engineering and design. The term engineering design has two words with different meanings, engineering, and design. The term engineering implies applications of laws and principles of science to design and analyze physical structures and components. In civil engineering, students apply the concept of physics and chemistry to design and build structures and buildings. In engineering disciplines, the term design means determining the dimensions, loads, and associated influences on the component due to the applied loads such as stresses and deformations. The estimation of such parameters is crucial to make the component or structure foolproof.

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3. In a drained tri-axial test, a specimen is confined under pressure and axially loaded until failure. The failure conditions of the specimen are analyzed for shear strength. What is the value of the minor principle stress? Half the value of the major principle stress Twice the value of the major principle stress . The same as the confining pressure The same as the cohesion value ● ● ●
Kindly answer all. If you can't answer all please leave it. Thank you
10-14. The state plane stress in a mass of dense cohesionless sand is described by the following stresses: Normal stress on horizontal plane Normal stress on vertical plane = 200 kPa Shear stress on horizontal and vertical planes 370 kPa 80 kPa %3! Determine by means of the Mohr circle the magnitude and direc- tion of the principal stresses. Is this state of stress safe against failure? (After A. Casagrande.)
A CID TXC test was performed on a sample of sand. At the end of consolidation, the back pressure was 140 kPa, and the cell pressure was 340 kPa. At failure, the deviator stress was (ơ1 – 03)f = 200 kPa. a. What was the total pore water pressure, u, at failure? b. Calculate the principle effective stresses, ơi' and os', at failure. c. Calculate the friction angle, d', for this soil.
Also, Determine the magnitude of the minor principal stresses (in kPa). Determine the magnitude of the major principal stresses (in kPa). Determine the magnitude of the maximum shear stress (in kPa). Determine the angle from principal plane to the maximum shear stress at the Mohr's Circle. Determine the orientation of the angle (from principal plane) should the specimen be rotated or inclined to achieve the maximum shear stress. At what angle (from horizontal; assume counter-clockwise rotation) should the specimen be rotated or inclined so that it will not be subjected to shear stress? Determine the normal stresses (in kPa) on plane AB. Determine the shear stresses (in kPa) on plane AB.
a）For clays, the failure line (one that connects the peak failure stresses) in the normally consolidated range does not have a cohesion intercept, whereas the failure line in the overconsolidated range has a cohesion intercept. T or F B）During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will: 1 decrease. 2 could increase or decrease. 3 remain a constant. 4 increase. C)What does the cohesion (that appears in the Mohr-Coulomb criterion) of OC clays depend on? 1the preconsolidation pressure. 2whether the failure stresses are total or effective. 3the soil type. 4everything listed here.
In a direct shear test on a specimen of cohesionless soil (sand), the vertical normal stress on the specimen is 210 kPa and the horizontal shear stress at failure is 135 kPa. You may assume the uniform stress distribution within the failure zone. a) determine the magnitude and direction of the principal stresses at failure using a Mohr's circle b) briefly explain whether it's possible to determine the magnitude and direction of the principal stresses when the material is not failed.
Select all true statements. In triaxial loading:When the water pressure increases, there is a transition from ductile to brittlebehavior.1-The confining pressure (03) is progressively increased to break the samplesubjected to uniform principal stresses (o1 = 02).2- When the confining pressure decreases, the behavior changes from strain-softening to strain-hardening. 3-When initially loaded, the rock specimen compresses and then begins to dilateas a result of internal fracturing.
can you help me solve question e? Thank you so much
The effective strength parameters for a clay are known to be cʹ = 15kPa and φʹ = 29°. A UU triaxial test and CUtriaxial test were performed on identical saturated samples of the same clay. In both cases, the cell pressure was 100 kPa. In the UU test, the deviator stress at failure was 98 kPa, and in the CU test, the deviator stress at failure was 264 kPa. Find:•The undrained shear strength, su, of the specimen from the UU test•The pore pressure in the specimen at failure in the UU test.•The value of the Skempton parameter A̅ f from the CU test
A student conducted 2 UU triaxial tests on Kaolin clay samples in the laboratory. Table 1 provides information regarding the sample dimensions and testing conditions used for the tests. Table 2 Provides the raw deformation and force gauge data obtained from UU tests.By producing Mohr circles and deviatoric stress vs axial strain plots of the tests using the data presented, determine the average Young's modulus, E ( MPa ) from the most linear portion of the tests deviatoric stress vs axial strain plots. Enter answer using 1 d. p, don't enter units).A student conducted 2 UU triaxial tests on Kaolin clay samples in the laboratory. Table 1 provides information regarding the sample dimensions and testing conditions used for the tests. Table 2 Provides the raw deformation and force gauge data obtained from UU tests. By producing Mohr circles and deviatoric stress vs axial strain plots of the tests using the data presented, determine the average Young's modulus, E (MPa) from the most linear…
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