Earth is required to be excavated from borrow pits for building an embankment. T

Question

Earth is required to be excavated from borrow pits for building an embankment. The wet unit weight

of undisturbed soil is 1 8 kN/m3 and its water content is 8%. In order to build a 4 m high embankment

with top width 2 m and side slopes 1:1, estimate the quantity of earth required to be excavated per

meter length of embankment. The dry unit weight required in the embankment is 15 kN/m3 with a

moisture content of 10%. Assume the specific gravity of solids as 2.67. Also determine the void

ratios and the degree of saturation of the soil in both the undisturbed and remolded states.

Explanation / Answer

Mass of sample M = 126 kg.

Volume V =

126

= 0.06 m

2.1 x l O 3

Now, Ms + Mw = M, or My + wMy = M?(l + w) = M

Therefore, M. = -^

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