Soil Mechanics Special

💥Water Content determination Method:-

1)Oven Drying Method:-

Simple and most accurate method,not field method.

2)Sand Bath Method:-

Quick,Field method.

3)Alcohol method:-

Quick,Field method should not be used for organic soil containing Calcium Compound.

4)Torsion Balance Method:-

Quick,Lab method,Infra-red radiations are used for drying sample.

5)Pycnometer Method:-

Quick method,Suitable for Cohesion Soils.

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💥Thixotropy:-

The property of regaining a part of strength after disturbance of remoulded clay sample is known as thixotropy.

💥Liquid Limit:-

Water content at which soil changes from liquid to plastic state.

💥Plastic Limit:-

Water content at which soil changes from plastic state to semi-solid state.

💥Shrinkage limit:-

Water content at which soil changes from semi solid to solid state.It is the lowest water content at which a soil can be completely saturated.

💥SENSITIVITY:-

It denotes degree of disturbance of undisturbed soil sample.

💥Liquefaction:-

Phenomenon in which soil losses its strength due to cyclic loading.

💥Honey-combed structure:-

Present in fine sands or silts.

💥Flocculated structure:-

Occurs in fine Clays and Colloids.

💥Dispersed structure:-

Occurs in remoulded Clays.

💥For Coarse grain Soil:-

Single grained structure.

Honey-combed structure.

💥For mixed soils:-

Coarse grained skeleton.

Clay matrix structure.