Explain the factors contributing to shear strength of cohesive and non cohesive soils

The factors contributing to the shear strength of cohesive soils are:

• Sample disturbance.
• For clays having a high sensitivity, such as quick clays, disturbance can severely affect the shear strength.
  The factors contributing to the shear strength of non-cohesive soils are:            
  1) Shape of Particles
  2) Gradation
  3) Denseness
  4) Confining Pressure
  5) Deviator stress
  6) Intermediate principal stress
  7) Loading
  8) Vibration and repeated loading
  9) Types of minerals
  10) Capillary moisture