Answered: friction angle of soil (ϕ’)? Also find…

friction angle of soil (ϕ’)? Also find out the failure plane angle (Ѳ) in this case? c. Find the normal stress Ϭ’ and the shear stress Ƭ on

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 12.23P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

A consolidated-drained triaxial test was conducted on a normally consolidated clay. The
results are, Ϭ3 = 300 kN/m2, (ΔϬd)f = 250 kN/m2. Determine? Draw a neat Mohr Circle to a
convenient scale and determine following?
a. Angle of friction ϕ’?
b. Derive a relation between angle Ѳ (that the failure plane makes with the major
principal plane) and internal friction angle of soil (ϕ’)? Also find out the failure plane
angle (Ѳ) in this case?
c. Find the normal stress Ϭ’ and the shear stress Ƭ on the failure plane?
d. Determine the effective normal stress on the plane of maximum shear stress and
orientation of this plane?
e. Determine the orientation of both major and minor principal planes?

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