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
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.
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| Question-Answer civil engineering study |
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