Question

A rigid footing subjected to vertical central load fails under general shear failue. The rupture surface developed is

• A. circular one sided rotational failure
• B. plane surface of failure originating at the edge of footing and extending downwards with orientation of Rankine passive state equilibrium
• C. symmetrical failure surface consisting of segment of spiral and Rankine's passive state failure surface
• D. symmetrical failure surface consisting of segments of log spiral and plane failure surface as per Rankine active state of equilibrium
  

Answer 1

The correct option is C symmetrical failure surface consisting of segment of spiral and Rankine's passive state failure surface