A borrow area soil has natural water content of 10% and bulk density of 1.8 g/cm3. The soil used for an embankment to be compacted at 18% moisture content to dry density 1.85 g/cm3, the amount of water to be added to 1 m3 of borrow soil and volume of soil for compacted embankment: * O 1.2,1.3 m3 O 1.2,1.1 m3 O 1.3,1.1 m3

In a fill section of a construction site, 1500 m3 of moist compacted soils is required. The design water content of the fill is 15%, and the design unit weight of the compacted soil is 18.5 kN/m3. Necessary soil is brought from a borrow site, with the soil having 12% natural water content, 17.5 kN/m3 wet unit weight, and Gs = 2.65.  How much (in cubic meters) of the borrow material is required to fill the construction fill section? And how heavy is it?

Coulomb's failure envelope for a soil is given by t₁ = C' + o' tan o'. For the same soil, the modified failure envelope in a q' - p' plot can be expressed as q' = m + p'tana. Express a as a function of o' and m as a function of C' and o'.