Question

The stress component at any point, after the excavation of the shaft, will be equal to ____________

(a) σR = (σZ)1-(σZ)2

(b) σZ = (σZ)1-(σZ)2

(c) σϴ = (σϴ)1-(σϴ)2

(d) σR = (σR)1-(σR)2

I have been asked this question during an online exam.

This question is from Stress Distribution in the Vicinity of Shafts topic in division Shafts, Tunnels and Conduits of Geotechnical Engineering II

Answer 1

Correct choice is (b) σZ = (σZ)1-(σZ)2

The explanation is: The stress component at any point, after the excavation of the shaft will be equal to the difference between the initial stresses i.e., σZ = (σZ) 1-(σZ) 2.