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Physical Properties Of Soils

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The soil properties and parameters can be broadly classified as
1)Physical
2)Engineering
3)Index

Physical soil properties include specific gravity, density, particle size and distribution and water content.
The water content represented by w of a soil sample is defined as the weight of free water in the sample expressed as a percentage of its dry weight.

The degree of saturation S is defined as the ratio of the volume of free water to its total volume of voids Vv

n=Vv/V
where n is the Porosity defined as the ratio of void volume to the total volume V of soil.

We need to calculate the value of e which is the void ratio to calculate degree of saturation. Once we know the value of e we can find S
S=wGs/e
where Gs – specific gravity of the soil particles and is usually in range of 2.67+ -0.05

The dry unit weight Yd(pronounced as gamma) of a soil specimen with any degree of saturation is calculated using the following formula

Yd=YwGsS/(1+wGs)

where w =unit weight of water having following values
Freshwater – 62.4 lb/ft3 or 1001 kg/m3
Seawater – 64.0 lb/ft31026.7 kg/m3

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Comments
  • senthilkumar March 19, 2008 at 10:37 am

    for me physical properties of soil much vailed since i am road engr

  • silty content test of sand March 13, 2010 at 12:31 am

    i reqiured the procedure of silt content test of sand

  • engr junde alesna March 31, 2011 at 11:42 pm

    thank for this , very useful

  • jitender kumar mishra September 3, 2011 at 9:10 am

    what is soil enginering and soil mechanics.

  • ansari July 13, 2012 at 1:59 am

    for G+12 ,Residential Tower , Soil S.B.C. is 08 tom/sqm,for design witch type foundation best Pile/ Raft

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