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Chapter: Civil - Soil Mechanics -Stress Distribution And Settlement

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Soil Mechanics: Cohesion and Stresses

Soil Mechanics: Cohesion and Stresses
Cohesion: it is the force of attractioon between the particles binding them togeth er. cohesion is present in clays and silts but is n ormally absent in sands and gravels.Cohesio n (C), is a measure of the forces that cement particles of soils.

Cohesion:

 

it is the force of attractioon between the particles binding them togeth er. cohesion is present in clays and silts but is n ormally absent in sands and gravels.Cohesio n (C), is a measure of the forces that cement particles of soils

Angle of Repose determ ined by:

 

        Particle size (hig her for large particles)

        Particle shape (higher for angular shapes)

        Shear strength (h igher for higher shear strength)

 

Stresses:

 

Gravity generates stresses (force per unit area) in the ground at different points. Stress on a plane at a given point is viewed in terms of two components:

1 Normal stress (?): acts normal to the plane and tend s to compress soil grains towards each oth er (volume change)

 

2Shear stress (?): a cts tangential to the plane and tends to slide grains relative to each other (distortion and ulti mately sliding failure)

 

3Factors Influenci ng Shear Strength:

The shearing strength is affected by:

 

        Soil composition: mineralogy, grain size and grain size distribution, shape of particles, pore fl uid type and content, ions on grain and in pore fluid.

 

        Initial state: State can be describe by terms such as: loose, dense, over-consolidated, no rmally consolidated, stiff, soft, etc.

 

        Structure: Refers to the arrangement of particles within the soil mass; the manner in whic h the particles are packed or distributed. Feaatures such as layers, voids, pockets, cementation, etc, are part of the structure.

 

4 Formulation of Shear Strength of Soil:

 

        In reality, a com plete shear strength formulation would acco unt for all previously stated factors.

Soil behavior is quite complex due to the possible variables s tated.


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