Critical plane in conduit is located at ___________
(a) Tangential to the top of the conduit
(b) Tangential to the bottom of the conduit
(c) Centre of the conduit
(d) All of the mentioned
This question was addressed to me in an online quiz.
Query is from Load on Positive and Negative Projecting Conduits topic in portion Shafts, Tunnels and Conduits of Geotechnical Engineering II