Question

If z-axis is considered to be directed downward from ground surface, then the stress component in z-axis at a point at a depth z due to self weight of soil above it is ___________

(a) σz=γz

(b) σz=μγz

(c) σz=\(\frac{μ}{1-μ}\)

(d) σz=\(\frac{μ}{1-μ}γz \)

This question was addressed to me in a job interview.

I'd like to ask this question from Stresses due to Self Weight topic in section Stress Distribution of Geotechnical Engineering I

Answer 1

The correct option is (a) σz=γz

The best explanation: When z-axis is considered to be directed downward from ground surface, then the stress component in z-axis at a point at a depth z due to self weight of soil above it is,

σz=γz, where σz is the normal the stress component in z-axis

γ=unit weight of soil

Z=depth at which the stress is calculated.