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?

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.



Question-Answer civil engineering study
Question-Answer civil engineering study


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