Water quantity / Volume of water calculation for the beds of Embankment/subgrade/GSB as per MORTH and Indian Standard

Water quantity calculation for the beds of Embankment/subgrade/GSB as per MORTH and Indian Standard

Welcome friends
Today we shall know about the calculation of water required for the beds (Embankment/sub-grade/GSB) to achieve the desired compaction

Let us consider

We want to calculate the water quantity for the bed of sub-grade so.......
Let us consider

Width of sub-grade bed (B) = 8 metre

Thickness of sub-grade layer(T) = 0.200 metre

Length of sub-grade bed(L) = 500 metre

Optimum moisture content (OMC) = 12 %
Then

Volume of sub-grade bed = length X width X thickness = L X B X T
= 500 X 8 X 0.200
= 800 cubic met.
Let
Moisture present in bed(it may be zero) = 4 %

(Note- Data of Moisture present in bed is calculated by lab team by rapid moisture metre or by using any other equipment )

Moisture required to get desired compaction in bed of sub-grade= OMC - Moisture present in sub-grade bed
= 12 - 4 =8%

(Note- Minimum compaction Require in bed of sub-grade is 97% of Maximum Dry Density (MDD))

Quantity of watet required in bed of sub-grade to get desired compaction = volume of sub-grade bed X moisture required
= 800 X 8%
= 800 X (8/100)
= 64 cubic metre

The above water quantity is in cubic metre so we shall convert it in litre

We know that
1 cubic metre = 1000 litre

Then water required to compact the bed of sub- grade = 64 cubic metre
= 64 X 1000
= 64000 litres

Requirement of water to achieve the desired compaction(Min. 97% of MDD) in the bed of sub- grade = 64000 litres

Hence we can also calculate the requirement of watet for various types of beds viz. EBM./ GSB.

CONFUSION SOLUTION

Some engineers think that they can calculate the water requirement of bed by multiplying volume of bed , MDD and OMC(Require moisture)......

This is totally wrong because when we calculate the value of OMC we plot a graph between dry density and water content........
So MDD is calculated at OMC.

So there is no need to use density term two times in the calculation of water requirement.....

I hope you have got your answer to short out your confusion.......
For more information you may comment..............

Thank you
Mukesh Kumar
Gyanofengineering

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