What is the angle of internal friction and cohesion of the soil?

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 10.20P
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A sample of moist sand was subjected to a series of triaxial tests. The soil fails under the following stresses

 

Cell pressure, σ3

Plunger stress, σd

Sample 1

11 kPa

20 kPa

Sample 2

26 kPa

31 kPa

What is the angle of internal friction and cohesion of the soil?

Please answer this asap. For upvote. Thank you very much

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