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Soil Mechanics and Foundation Engineering

Q1: Pick up the incorrect statement from the following:

A Compaction has no effect on the structure of a soil

B Permeability decreases with increase in the dry density of a compacted soil

C A wet side compacted soil is more compressible than a dry side compacted soil

D Dry side compaction soils swell more when given access to moisture

E None of the these.

ANS:A - Compaction has no effect on the structure of a soil

On dry of optimum soil has flocculated structure whereas on wet of optimum it rearranges to a dispersed structure. If a structure is compacted on dry side of optimum then it shows flocculated structure whereas, if it is compacted on the wet side of optimum then it shoes the dispersed structure. Yes, the structure of soil will change due to compaction since it is a 3 phase system in soil mechanics. Because compaction causes the structure to hold good, if you build a structure on poor compacted soil, it will get twisted.



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