Introduction and Terminology

May 5th, 2015
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State whether the following statements are True or False 1. Soils below water tables are fully saturated. Soils below tables are sat 2. All soils above water table are unsaturated. 3. Compacted soils are generally unsaturated soils. 4. Shear strength of a saturated clayey sand is greater than its unsaturated shear strength.

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SoilOUTLINE Introduction and TerminologyAdvancedAdvanced Soil Mechanics &Foundation DesignUNSATURATED SOILMECHANICSA/Prof Hadi KhabbazEmail: hadi.khabbaz@uts.edu.au Suction and Measurement Methods Effective Stress Concept for UnsaturatedSoils Soil Water Characteristic Curve (SWCC)Ch(SWCC) Permeability of Unsaturated Soils Shear strength of Unsaturated Soils Examples ConclusionsRoom 2.511BIntroduction&TerminologyState whether the following statements are True or False1. Soils below water tables are fully saturated.Soils belotables aresat2. All soils above water table are unsaturated.3. Compacted soils are generally unsaturated soils.4. Shear strength of a saturated clayey sand is greaterthan its unsaturated shear strength.Why do we needto understandUnsaturated SoilMechanics?Most of the natural soil systems are in arid and semiarid regions and soils subjected to seasonal moisture deficits are in an unsaturated state.Who needs unsaturated soil mechanics?Every geotechnical engineer needs to be aware of thethrole played by the portion of soil with negative porepressure (i.e. generally the portion above the water table).Many present solutions in soil mechanics andfoundation design are quite approximate and based onsaturated soils. More research is still required.1Stress Distribution during the desiccation of a soilStress Distribution during the desiccation of a soilCertainly there is a need for a

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