Soil Suction –
And pressure due to capillary water rise is negative. also, it reduced to below atmospheric pressure, now from the previous statement we can say
the soil is in a state of reduced pressure is known as soil suction.
Soil Suction Test –
Suction Plate Method –
soil sample which suction is tested is placed over the porous plate.
below porous plate water is filled. so soil starts suction of water but pipe connected to vacuum pump applies a vacuum force by which reading is set.
mercury level pipe also connected mid between vacuum pump and soil sample,
so a reduction in pressure is measured because soil tries to suck water and vacuum try to maintain water level. when the soil starts suction vacuum force reduced. and its measure by mercury level.
Centrifugal method –
a box type instrument with brass case (as shown in fig) connect to the rotating device by a shaft,
the center part contains the porous pot. and side of porous pot maintains a gap between the inside casing of brass.
firstly a soil sample is placed on a porous pot, then throw the rotating shaft rotation is applied which give the centrifugal action of rotation,
the water from the soil comes out and drained throw the porous pot and then comes on outside of the porous pot and finely after maintaining a level inside brace casing its travel throw hole.
analysis the amount of water finally collect we can find the soil suction.
Tensiometer method –
this type of suction test, a U shape container (as shown in fig) contain a porous pot used for the test,
soil which suction is tested is filled in the container. then a pipe contains water connecting to the porous pot.
pipe contains water and at the end, it maintains a mercury level.
when the pipe valve is open soil star suction of water and mercury level drop by some hight.
finally, a stage comes where no more reduction in mercury level comes and it attains an equilibrium stage.
finally, from the change in mercury height, we can find the soil suction.
Factor affects soil suction –
2. Temperature – soil suction decrease as the temperature increase.
3.Water content – water content decrease soil suction increase and attain maximum value in full dry case of soil.
4. Densenceness – Dense soil give large suction and lose soil give low suction.
5. The angle of contact – when the angle of contact is zero soil suction maximum.
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