Soil Exploration Civil Engineering (CE) Notes | EduRev

Civil Engineering SSC JE (Technical)

Civil Engineering (CE) : Soil Exploration Civil Engineering (CE) Notes | EduRev

The document Soil Exploration Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
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Chapter 16 
Soil Exploration

SOIL SAMPLE AND SAMPLERS
The soil samples can be of two types: disturbed and undisturbed. A disturbed sample is that in which the natural structure of sols get partly or fully modified and destroyed, although with suitable precautions the natural water content may be preserved. Such a sample should, however, be representative of the natural soil by maintaining the original  proportional of the various soil particles intact.
An undisturbed sample is that in which the natural structure and properties remain preserved.

Soil Exploration Civil Engineering (CE) Notes | EduRev

(i) Inside Clearance
Soil Exploration Civil Engineering (CE) Notes | EduRev

1<Ci<3

(ii) Outside Clearance
Soil Exploration Civil Engineering (CE) Notes | EduRev

1<Co<2

(iii) Area Ratio (Ar)
Soil Exploration Civil Engineering (CE) Notes | EduRev
Ar < 20% for stiff formation,
Ar < 10% for soft clays

(iv) Recovery Ratio (Lr)
Soil Exploration Civil Engineering (CE) Notes | EduRev

Lr =1  Good recovery
L<1 Compressed
Lr <1  Swelled
where,
D3 = Inner dia of sampling tube
D4 = Outer dia of sampling tube
D1 = Inner dia of cutting tube
D2 = Outer dia of cutting tube

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