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Question-Answer:

Which one of the following is an assumption made by Coulomb in the development of his earth pressure theory for sand and for active state?

(a) The rupture surface is non-uniform surface
(b) There is a wall friction on the pressure surface
(c) Failure is three dimensional
(d) The soil is cohesive

Ans. (b)

Assumptions of Coulomb’s theory:

1. Soil is homogeneous, isotropic, semi infinite, dry and cohesion-less.
2. Face of wall in contact with backfill is vertical or inclined and is rough.
3. The failure wedge acts as a rigid body and stresses over it are uniform distributed.
4. The failure is essentially 2D and rupture surface is planer which passes from heel of the wall.
5. The location and direction of resultant thrust is known which passes from lower third point of the wall by assuming triangular distribution of earth pressure.
6. Wedge failure is considered which is under equilibrium.