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Description

Determine the unit weight of natural soil in place.

Stages
Determination of sand filling the cone
Determination bulk unit weight of sand
Determination bulk unit weight of natural soil

Procedure

Determining the weight of sand filling the cone

Sand passing through a 600µ sieve and retained over 300µ sieve is used.
Pouring cylinder attached over pouring cone is placed over level ground and completely filled with sand and weighed

The weight of sand + cylinder before pouring =_1

Now place the cylinder on the glass plate and open the shutter allow the sand to run out. Weigh the sand collected on the glass plate. This is the weight of sand filling pouring cone.

The weight of sand in pouring cone =_
The weight of sand + cylinder after pouring on the glass =_2
The weight of sand in pouring cone =_=_1−_2

Determination of bulk unit weight of sand

Determine the volume of the calibrated container (V)

Filled the pouring cylinder with weight _1 again. Now placed over calibrating container and open the shutter, permit the sand to run into calibrating cylinder. When no further movement of sand is seen, close the shutter. Remove the pouring cylinder and weigh it.

The weight of sand + cylinder after pouring into calibrated cylinder =_3

The weight of sand filling calibrated cylinder (_ )=_1−(_+_3 ")"

Determination of bulk unit weight of natural soil

Exposed about 45 cm square area of the soil and trim it down to a level surface.
Keep the metal tray on the level surface and excavate a circular hole of 10 cm diameter and 15 cm depth.

The weight of excavated soil =^′

Remove the tray, and placed the sand pouring cylinder over the hole, the cylinder should have sand of weight _1.

Open the shutter and permit the sand to run into the hole. Close the shutter when no movement of the sand seen.

Remove the cylinder and weigh the sand pouring cylinder.

The weight of sand +cylinder after pouring into hole =_4

The weight of sand in the hole 〖(〗_ℎ)=_1−(_4+_)

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