stress-strain

stress-strain - Soil Stress-Strain Foundation Design CE 482...

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Soil Stress-Strain Foundation Design CE 482
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Strain Mechanism Particle deformation/distortion/crushing Relative motion among particles (sliding/rolling)
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Strain Mechanism
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Types of Strain Isotropic compression Confined compression Triaxial compression Direct shear
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Isotropic Compression Large volumetric strains can occur due to sliding/rolling between particles Tangential forces are created at contact points Tangential forces average out to zero over a surface passed through many contact points Shear stress on any plane is zero even while large shear forces exist at contact points
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Isotropic Compression Similar to confined compression Confined compression occurs commonly Isotropic compression seldom occurs in nature
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Confined Compression
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Confined Compression Soil becomes denser/stiffer with increasing stress “locking” – characteristic of particulate systems Loose arrays within soil collapse Dense arrays later collapse Finally contact points crush Yielding starts when soil particles fracture Fracturing permits tighter packing of new and remaining particles average force per contact is decreased since the number of particles has increased
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This note was uploaded on 10/07/2009 for the course CE 482 at USC.

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stress-strain - Soil Stress-Strain Foundation Design CE 482...

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