Answered: 6. A rock unit has a unit cohesion of…

6. A rock unit has a unit cohesion of 400 psf and an an- gle of internal friction of 35°. When the normal stress is 1600 psf, what is the shear strength of the rock?

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 8.2P: A point load of 500 kN is applied at the ground level. Plot the lateral variation of the vertical...

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Concept explainers

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

16. A rock unit has a unit cohesion of 400 psf and an an-
gle of internal friction of 35°. When the normal stress
is 1600 psf, what is the shear strength of the rock?

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