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If the auxiliary plane in hydrostatic axis passes through the origin, then its equation is _____________

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+1 vote
in Geotechnical Engineering II by (93.8k points)
If the auxiliary plane in hydrostatic axis passes through the origin, then its equation is _____________

(a) σ1+σ2+σ3=0

(b) σ1+σ2+σ3=constant

(c) I1+ I2+I3 =0

(d) f(σ1,σ2,σ3)=0

This question was addressed to me during an online interview.

Enquiry is from The Mohr in section Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Correct choice is (a) σ1+σ2+σ3=0

For 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.

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