Question

(True / False) Lowering the groundwater table results in an increase in geostatic effective stress.

(True or False) Consolidation is the squeezing of air voids using mechanical energy ?

In the consolidation saturated soils (typically clays and silts) are loaded vertically. When is the excess pore pressure (ue) larger?

(a) t = 5 min ( b) t= 120 mi select one

Answer 1

1.True

yes it is true that lowering the water table results in increase in geostatic effective stress beacause we know that

effective stress = Total stresses - pore pressure

so lowering the water table result in decrease of pore pressure so net effective stresses increases.

2.False

Squeezing of air out of the soil pores is the phenomenon which is called as compaction of soil

while squeezing of water out of the pores of soil is called as consolidation .

Compaction is a fast process while consolidation is slow process.

3.

a. at t=5 min the pore water pressure will be more it will disipate and effective stresses will increase  and this process is known as consolidation.

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