Geotechnical Engineering

The Mohr

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The concept of a three dimension yield envelope was presented by _________
D.C. Drucker and Prager
Mohr
None of the mentioned
All of the mentioned
Explanation:
The effect of intermediate principal was studied by D.C. Drucker and W. Prager in 1952, who proposed the concept of a three dimensional yield envelope.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The Mohr’s theory of failure can be symbolically expressed as ____________
τmax=F(σn) and σmax–σmin = f(σmax +σmin)
τmax = σmax– σmin
None of the mentioned
All of the mentioned
Explanation:
Mohr’s theory of failure can be symbolically expressed as:
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The intersection of the yield surface or envelope with octahedral plane is called ____________
Yield point
Deviation point
Failure locus
Space diagonal
Explanation:
The intersection of yield surface with octahedral plane is called the failure locus. A point on the failure locus represents the stress state at incipient failure.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The yield or failure criterion can be expressed as ____________
f(I1,I2)=0
f(I1,I2,I3)=0
f(σ1,σ2,σ3)=0
f(σmax +σmin)
Explanation:
The yield criterion may be expressed as f (I1, I2, I3) = 0
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following equation represent hydrostatic pressure in its purest form?
σ1+σ2+σ3=0
σ1+σ2+σ3=constant
σ1=σ2=σ3
σmax+ σmin
Explanation:
According to cross land σ1=σ2=σ3 represent hydrostatic pressure in its purest form.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The hydrostatic pressure’s inability to produce failure under normal pressure was first demonstrated by ___________
Cross land
W. Pager
D.C. Drucker
Mohr
Explanation:
Experiments conducted by Cross land in 1965 have demonstrated that a pure state of hydrostatic pressure is unable to produce failure even under enormous pressure.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
If the auxiliary plane in hydrostatic axis passes through the origin, then its equation is _____________
σ1+σ2+σ3=0
σ1+σ2+σ3=constant
I1+ I2+I3 =0
f(σ1,σ2,σ3)=0
Explanation:
If the auxiliary plane passes through the origin its equation is σ1+σ2+σ3=0 and equation will be σ1+σ2+σ3=constant if the plane is perpendicular to the hydrostatic axis.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The auxiliary plane in the hydrostatic axis can also be called as ___________
Failure plane
Octahedral plane
Deviatoric plane
Principal plane
Explanation:
Since all the points in the auxiliary plane represent deviatorial state of stress, the plane is also called the deviatoric plane.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
A major drawback of Mohr criterion is ____________
Shape of the envelope
Principal stress
Shape of the plane
All of the mentioned
Explanation:
The major drawback of Mohr criterion is that the curved shape of the envelope, hence the functional form of the equation τmax=F (σn) is not amendable to mathematical computation.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The Mohr-Coulomb criterion assumes that the strength of the soil is independent of ____________
σ1
σ2
σ3
All of the mentioned
Explanation:
The Mohr-Coulomb criterion implicitly assumes that the strength is independent of the intermediate principal stress σ2.