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 Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.11P: Refer to Figure 10.42. Due to application of line loads q1 and q2, the vertical stress increase at...

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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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