sma08 - ONE DIMENSIONAL SETTLEMENT BEHAVIOUR Embankment...

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Unformatted text preview: ONE DIMENSIONAL SETTLEMENT BEHAVIOUR Embankment loading on a layered soil x z Rock Soil layer 1 Embankment Soil layer 2 Before loading After loading If the embankment is wide compared to the depth of the soil layer then the restraining effect of adjacent columns of soil prevents horizontal movement. Thus there is vertical strain but no horizontal strain Embankment loading on a layered soil Example of a large loaded area, conditions beneath approximately 1-D Cell Loading cap Load Displacement measuring device Soil sample wate r Porous disks Measurement of soil properties The oedometer apparatus ∆ x ∆ z ∆ x xx ( ) 1- ε ∆ z zz ( ) 1- ε (a) Before Deformation (b) After Deformation Relation between axial and volume strain ∆ x ∆ z ∆ x xx ( ) 1- ε ∆ z zz ( ) 1- ε (a) Before Deformation (b) After Deformation Relation between axial and volume strain Volume strain (1) ∆ x ∆ z ∆ x xx ( ) 1- ε ∆ z zz ( ) 1- ε (a) Before Deformation (b) After Deformation Relation between axial and volume strain Volume strain (a) V = V o = ∆ x ∆ y ∆ z (1) ∆ x ∆ z ∆ x xx ( ) 1- ε ∆ z zz ( ) 1- ε (a) Before Deformation (b) After Deformation Relation between axial and volume strain Volume strain (a) V = V o = ∆ x ∆ y ∆ z (b) [ ] [ ] [ ] V x y z xx yy zz =- ×- ×- ∆ ∆ ∆ ( ) ( ) ( ) 1 1 1 ε ε ε (1) (2a) Relation between axial and volume strain (2b) ε v V V V =-- Relation between axial and volume strain ε v V V V =--...
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sma08 - ONE DIMENSIONAL SETTLEMENT BEHAVIOUR Embankment...

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