Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion
Discussion Forum : Soil Mechanics and Foundation Engineering - Section 1 (Q.No. 5)
5.
Which one of the following statements is true ?
Discussion:
58 comments Page 1 of 6.
Tine said:
1 decade ago
How can clay be more porous as compared to sand?
Mayuri patil said:
1 decade ago
Porosity of clay is 33-60%.
And porosity of sand is 20-35%.
Hence clay is more porous than sand.
And porosity of sand is 20-35%.
Hence clay is more porous than sand.
Chandan ku said:
1 decade ago
How many type of cement used in construction?
Biswa said:
1 decade ago
Water easily pass through sand, but not incase of clay. So how option A is right?
Vk kushvaha said:
1 decade ago
Porosity is inversely proportional of permeability.
That is porosity of clay >silt >sand > gravel.
Where as permeability is gravel >sand >silt> clay.
That is porosity of clay >silt >sand > gravel.
Where as permeability is gravel >sand >silt> clay.
Bob Rat said:
1 decade ago
Porosity and permeability are directly proportional. As your porosity increases, so does your permeability. Porosity is related mathematically to your void space as porosity, let's call it p, p = v_v/v_t where v_v is volume of voids and v_t is volume total.
If your void space is increased then the ability for water to flow through is also increased because there is more space for fluid to flow naturally. Therefore, Biswas's confusion above is legitimate. This question is improperly worded.
If your void space is increased then the ability for water to flow through is also increased because there is more space for fluid to flow naturally. Therefore, Biswas's confusion above is legitimate. This question is improperly worded.
Yaregal said:
10 years ago
Pore size and it's connectivity determines the porosity of the soil. It is possible to have almost zero permeability for large spacing.
AKHIL KS said:
10 years ago
Porosity refers to the open spaces within a material. Porosity values are based on the ratio of pore volume to total volume and it is more in clayey soil.
Porosity of gravel: 25-40%.
Porosity of sand: 25-50%.
Porosity of clay: 40-70%.
Permeability refers to the ability of a material to allow for the passage of a fluid due to interconnected voids. Permeability of gravel>sand>clay.
Porosity of gravel: 25-40%.
Porosity of sand: 25-50%.
Porosity of clay: 40-70%.
Permeability refers to the ability of a material to allow for the passage of a fluid due to interconnected voids. Permeability of gravel>sand>clay.
Shehzad said:
10 years ago
Let us talk in terms of bulk density. Bulk density of clay's is less than that of sands. If we compare the masses of both clay and sand particles in two containers of equal volume, then there will be larger volume of voids inside the container of clay's which shows higher porosity of clay than sands.
Abi said:
10 years ago
Porous layer means D layer in which water can pass. As compared to clay the sand is more porous, so that in case of slow sand filter or rapid sand filter the sand bed are used.
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