Below are results from three unconsolidated undrained triaxial tests performed on a fully saturated clay specimen: Test No. 1 3 Minor principal stress (psi) Major principal stress at failure (psi) 10 25 33 22 37 45 Moisture content = 21 % Determine: a) Void ratio (e) of the soil. You may use es = wG_ (assume Gs = 2.70) b) Deviatory stress at failure for each test trial Shear strength parameters (Cu and ). Hint: Sketch the Mohr's circles for the three trials.

Below are results from three unconsolidated undrained triaxial tests performed on a fully saturated clay specimen: Test No. 1 3 Minor principal stress (psi) Major principal stress at failure (psi) 10 25 33 22 37 45 Moisture content = 21 % Determine: a) Void ratio (e) of the soil. You may use es = wG_ (assume Gs = 2.70) b) Deviatory stress at failure for each test trial Shear strength parameters (Cu and ). Hint: Sketch the Mohr's circles for the three trials.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.5P

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Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

Below are results from three unconsolidated undrained triaxial tests performed on a fully saturated
clay specimen:
Test No.
1
2
Minor principal stress (psi)
Major principal stress at failure (psi)
10
25
33
22
37
45
Moisture content = 21 %
Determine:
a)
Void ratio (e) of the soil. You may use eS = wG_ (assume Gs = 2.70)
%3D
b)
Deviatory stress at failure for each test trial
c)
Shear strength parameters (cu and ø). Hint: Sketch the Mohr's circles for the three
trials.
3.

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9. A consolidated drained test was carried out on a sandy clay under a cell pressure of 250 kPa. A constant back pressure of 120 kPa applied throughout the test. The dimensions of the sample were 76 mm x 38 mm. Addional test data recorded at failure were: Load transducer force = 368 N 3 Measured change in volume = 2.42 x 10 m³ Axial deformation = 2.05 mm Determine the major principal stress, o, at failure. (455 kPa)
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