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Cohesion (geology)

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Cohesion is the component of shear strength of a rock or soil that is independent of interparticle friction.

In soils, true cohesion is caused by one of three things:

  1. Electrostatic forces in stiff overconsolidated clays (which may be lost through weathering)
  2. Cementing by Fe2O3, CaCO3, NaCl, etc
  3. Root cohesion (which may be lost through logging or fire of the contributing plants, or through solution)

There can also be apparent cohesion. This is caused by:

  1. Negative capillary pressure (which is lost upon wetting)
  2. Pore pressure response during undrained loading (which is lost through time)

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[edit] References

v • d • e
Topics in geotechnical engineering
Soils
Clay · Silt · Sand · Gravel · Peat
Soil properties
Soil mechanics
Geotechnical investigation
Laboratory tests
Field tests
Foundations
Retaining walls
Slope stability
Earthquakes
Geosynthetics
Instrumentation for Stability Monitoring

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