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Soil Mechanics and Foundation Engineering - Engineering

Q1:

Pick up the correct statement from the following:

A When stress decreases, void, ratio decreases

B When stress decreases, coefficient of permeability decreases

C When stress decreases, coefficient of volume change decreases

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

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.