Consolidation I (CH11). Consolidation Process by which an in  ’ causes a deformation of a soil mass by reducing its e (water seeps out of the voids).

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Presentation transcript:

Consolidation I (CH11)

Consolidation Process by which an in  ’ causes a deformation of a soil mass by reducing its e (water seeps out of the voids). How can  ’ increase? 1. Water level decreases 2. A load is induced (we will consider fills)

Consolidation Physics From Coduto 1998 (text)

Hydrostatic Pore Pressure, u h z Ground surface Soil,  “hydrostatic pore water pressure at A” hphp

Excess Pore Pressure, u e Pore pressure generated in excess of hydrostatic due to an applied load. u e is temporary

Loading Conditions DENSE Soil densifies due to the change in structure (e ) (water squeezes out of the voids) LOOSE shear

LR: Loading rate? DR: Drainage rate? = fn (k) Water drains out, volume change, e Water carries load, no volume change, e = ct. DRAINED UNDRAINED Loading Conditions u e is generated!

Drainage rate = fn (k) Consolidation = time - dependent Loading Conditions Units?

Consolidation Physics From Coduto 1998 (text)

Consolidation Physics From Coduto 1998 (text)

Important Conclusion Consolidation involves a gradual transfer of stress from the pore water (u e ) to the soil particles (  ’).

Important Conclusion Deformation occurs only if particles experience a change in effective stress.

Lab Testing Consolidation test to assess the compressibility characteristics of clays.

Lab Testing Board…

Field vs. Lab From Coduto 1998 (text)

Consolidation Curve - LAB e  ’ (log scale) p’p’ eoeo crcr c yield

Example