Void Ratio
Void ratio, abbreviated as e, a dimensionless number, is the ratio of the volume of voids to the volume of solids.
Void Ratio formula
\(\large{ e = \frac {V_v} {V_s } }\) | |
\(\large{ e = \frac { V_v }{ V_t \;-\; V_v } }\) | |
\(\large{ e = \frac { n }{ 1 \;-\; n } }\) | |
\(\large{ e = \frac { w \; G_s }{ S } }\) | |
\(\large{ e = \left[ \frac { G_s \; \left( 1 \;+\; w \right) \; \gamma_w }{ Y } \right] \; -1 }\) |
Where:
\(\large{ e }\) = void ratio
\(\large{ Y }\) = bulk density
\(\large{ S }\) = degree of saturation (expressed as %)
\(\large{ n }\) = porosity
\(\large{ G_s }\) = specific gravity of soil
\(\large{ V_t } \) = total volume of soil
\(\large{ \gamma_w } \) (Greek symbol gamma) = unit weight of water
\(\large{ V_s }\) = volume of solids
\(\large{ V_v} \) = volume of voids
\(\large{ w }\) = water content (% moisture contemt)