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Soil Mechanics and Foundation

Soil Mechanics and Foundation
The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is

43833
43832
3
1

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Soil Mechanics and Foundation
A grillage foundation

Consists of two sets of perpendicularly placed steel beams
All of these
Is treated as spread foundation
Is provided for heavily loaded isolated columns

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Soil Mechanics and Foundation
During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm² to 0.26 N/mm², the pore water pressure increases from 0.07 N/mm² to 0.15 “N/mm². Skempton’s pore pressure parameter B is

-2
-0.5
2
0.5

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Soil Mechanics and Foundation
Time factor for a clay layer is

inversely proportional to drainage path
a dimensional parameter
independent of thickness of clay layer
directly proportional to permeability of soil

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Soil Mechanics and Foundation
According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

PI>27
17
0 < PI < 7
7

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Soil Mechanics and Foundation
Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is

6 months
24 months
3 months
12 months

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