could someone help me please ? i need answers for all of them within 2 days Ques

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could someone help me please ? i need answers for all of them within 2 days

Question 4 (exercise) An embankment is to be compacted to a dry unit weight of 21 kN/m3. The soil has to be trucked from a borrow pit. The bulk unit weight of the borrow pit soil is 19.5 kN/m3 and its natural water content is 5%. Calculate the volume of soil from the borrow pit required for 1 cubic meter of embankment. If the borrow soil is to be compacted at a water content of 10%, determine the amount of water in kN required to add to 1 cubic meter of soil. Question 5 (exercise) The plastic index of soil A is 25 and its liquidity index is 1.5 and liquid limit is 55%, determine its void ratio e

Explanation / Answer

Given, dry unit weight ( Y d) = 21kN/m3

Bulk unit weight ( Y b) = 19.5kN/ m3

Now, Y d = Y b / (1+ w)

=> 21= 19.5/ (1+w)

=> w= 0.072

Y b = w/ v

Where v= volume of soil from the borrow pit

So, v= 0.072/ 19.5 = 0.0036 m3

The plastic index of soil is given by

Liquidity index = ( soil moisture content - plastic limit) ÷ plasticity index

Liquidity index = 1.5

plastic limit= 55%= 0.55

plasticity index = 25

putting these values in the above equation we get,

soil moisture content= ( 25× 1.5)+ 0.55 = 38.05

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