Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion
Discussion Forum : Soil Mechanics and Foundation Engineering - Section 3 (Q.No. 15)
15.
If dry density, water density and specific gravity of solids of a given soil sample are 1.6 g/cc, 1.84 g/cc and 2.56 respectively, the porosity of the soil sample, is
Discussion:
30 comments Page 3 of 3.
Doyel said:
8 years ago
Taking value of water density as 1.84 g/cc, answer comes to be 0.67.
Is not this the right answer?
Is not this the right answer?
Munshi said:
8 years ago
Just remember that whatever value of water density is given we have to neglect it, density of water is fixed at 1g/cc.
Satendra said:
8 years ago
@Raval Chaitanya.
How water content get .15?
How water content get .15?
Raval Chaitanya Vajendrakumar said:
9 years ago
The value of water density is given to find the right value of degree of saturation,
As we have found void ratio = 0.6.
We have ,
e * s = w * g,
=> S = (.15 * 2.56)/0.6,
=> S = 64%. Where w = (1.84/1.6)-1.
As we have found void ratio = 0.6.
We have ,
e * s = w * g,
=> S = (.15 * 2.56)/0.6,
=> S = 64%. Where w = (1.84/1.6)-1.
Anonymous said:
9 years ago
If we have to take the density of water as 1 gm/cc then why 1.84 g/cc is given in question?
In order to get the right answer ignore the value given in question.
In order to get the right answer ignore the value given in question.
Sudarsan Sahoo said:
9 years ago
Then what about the value of water density or what does that signify?
Bhakt said:
9 years ago
Both are right @Rubby and @Reddy.
The void ratio is (e).
The void ratio is (e).
N SAMEER GUPTA said:
10 years ago
You calculated void ratio not porosity.
Ruby said:
1 decade ago
1.6 = (1*2.56)/(1+e);
e = 0.6;
n = e/1+e;
n = 0.6/(1+0.6);
Then n = 0.375.
e = 0.6;
n = e/1+e;
n = 0.6/(1+0.6);
Then n = 0.375.
S.Rajashekar Reddy iiit basar said:
1 decade ago
Dry density of soil is = 1.6g/cc.
Specific gravity of soil = 2.56.
Density of water take it as = 1g/cc.
Then use the relation between dry density and void ratio,
i.e,dry density of soil = (specific gravity*density of water)/(1+void ratio).
Here you got void ratio value then use the relation between porosity and void ratio.
Then you will get answer as 0.375.
Specific gravity of soil = 2.56.
Density of water take it as = 1g/cc.
Then use the relation between dry density and void ratio,
i.e,dry density of soil = (specific gravity*density of water)/(1+void ratio).
Here you got void ratio value then use the relation between porosity and void ratio.
Then you will get answer as 0.375.
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