Thursday, December 2, 2010

EARTH FILLING & COMPACTION

Earth filling & compaction are the important aspects in the construction of
structural building. The process of  compaction after the filling of earth to several layers
has three beneficial.

*      Reduces its compressibility
*      Reduces its permeability
*      Increases its strength

Theory of earth filling & compaction

Soil can be considered in earth filling to consist of three components or phases.

*      Solid soil particles
*      Liquid usually water
*      Gas usually air

            If no gas is present the soil is said to be saturated and if it contains no liquid
it is Dry soil particles are mechanically made to pack more closely through a
reduction in the air voids. The amount of compaction hence can be observed
depends on the following
conditions.

*      Compactive effort applied
*      Pre-existing density
*      Moisture content
*      Percentage of air voids in soil
*      Percentage of air voids in soil

When the moisture content is low the soil is stiff and difficult to compress
 and consequently a low density and high air voids are achieved.

            As the moisture content is increased the water act as a lubricant causing the soil to soften & lubricant become 

Earth Filling

            For this purpose the excavated soil (earth) was used. Earth was filled about 150mm thick layers in each & having 3 or 4 layers.
Compaction

            The compaction was done by using two types of machines. They are,
*      Rammer machine
*      Plate compactor machine
In the case the most effective consolidation of fill material was obtained by
compacting of 150-300mm layers and that compacted by using the rammer machine. In the end of the filing, the plate compacter is used for even soil surface.

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