METHODS OF FIELD COMPACTION | Soil Mechanics

METHODS OF FIELD COMPACTION


The various methods of field compaction are

1) Rolling :

Different types of rollers are used for compaction of soils. 

The compaction depends upon the following factors :

  • Contact pressure
  • Number of passes (normally 5 to 15)
  • Layer thickness (less than 15 cm) 
  • Speed of roller

Different types of rollers used are,

i) Smooth wheel rollers

ii) Pneumatic tyred rollers

iii) Sheep foot rollers

iv) Track laying vehicles

2) Ramming :

A hand operated rammer (tamper) consists of a block of iron, about 3 to 5 kg in mass, attached to a wooden rod. 

The rammer is lifted for about 0.30 m and dropped on the soil to be compacted.

A mechanical rammer is operated by compressed air or gasoline power. It is much heavier, about 30 to 150 kg. 

Mechanical rammers have been used up to a mass of 1000 kg in some special cases. 

Tampers are used to compact soils adjacent to existing structures or confined areas such as trenches, within plinth of building etc.

3) Vibrations :

In vibratory compactors, vibrations are induced in the soil during compaction. 

The compactors are available in a variety of forms. 

When the vibrator is mounted on a drum, it is called a vibratory roller. 

These rollers are available both as pneumatic type and the smooth wheel type. 

In a smooth wheel type, a separate motor drives an arrangement of eccentric weights to create high frequency, low-amplitude, up and down oscillations of the drum. 

These rollers are suitable for compacting granular soils. 

In a pneumatic tyred vibratory compactor, a separate vibrating unit is attached to the wheel axle.

Another form of vibratory compactor is a vibrating plate compactor. 

Hand operated vibrating plates are also available. 

The effect of the vibrating plates is limited to small depths. 

Their main use is to compact granular base courses for highway and runways, where thickness of layers is small.


Comments

READ ARTICLES:

VARIOUS METHODS FOR SEDIMENT CONTROL IN ALLUVIAL RIVER

What is the Importance of Geometric Design of Highway?

WHAT IS LINEAR PROGRAMMING? | ADVANTAGES AND LIMITATIONS OF LP | APPLICATIONS OF LP

LINEAR PROGRAMMING - GRAPHICAL METHOD, SIMPLEX METHOD AND BIG-M METHOD

GROUND WATER HYDROLOGY NUMERICALS | HYDROLOGY AND WATER RESOURCES ENGINEERING