Pick up the correct statement from the following:

ANS:D - When stress decreases void ratio, co-effi-cients of per-meability and volume change decrease.

"When stress decreases void ratio" i.e. if stress has to decrease void ratio stress should be increased.

If stress increases mv decreases as it is inversely proportional to stress increase. As k and mv are directly proportional, k also decreases if mv decreases. Av = e1-e2 / q1-q2

if q decrease then the coefficient of compressibility (Av) increases. and void ratio e = e1 - e2 decreases due to increase in stress

If Av increases then Mv = Av/1+e, Mv also increases.

then the permeability K = Cv . Mv . Yw if Mv increases then K also increases.