Question

The maximum value of σz on vertical line is obtained at the point of intersection of vertical plane with radial line at the angle of ____________

(a) 39°30’

(b) 39°45’

(c) 35°15’

(d) 39°15’

This question was addressed to me in unit test.

This is a very interesting question from Stress Distribution in portion Stress Distribution of Geotechnical Engineering I

Answer 1

The correct option is (d) 39°15’

The best explanation: The vertical stress first increases, attains a maximum value and then decreases. It can be shown that the maximum value of σz on vertical line is obtained at the point of intersection of vertical plane with radial line at the angle of39°15’.