GEO TERMS: SETTLEMENT IN SOIL Flashcards

1
Q

the ultimate consolidation settlement of a structure resting on a soil…

A. decreases with the increase in the initial voids ratio
B. decreases with the decrease in the plastic limit
C. increases with the increase in the initial voids ratio
D. increases with the decrease in the porosity of the soil

A

A. decreases with the increase in the initial voids ratio

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2
Q

the coefficient of compressibility of soil is the ratio of _____

A. stress to strain
B. strain to stress
C. stress to settlement
D. rate of loading to that of settlement

A

B. strain to stress

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3
Q

a clay subjected to pressure in excess to its present over-burden, is said to be _____

A. pre-compressed
B. pre-consolidated
C. over-consolidated
D. all the above

A

D. all the above

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4
Q

which one of the following clays behaves like a dense sand?

A. over-consolidated clay with a high over-consolidation ratio
B. over-consolidated clay with a low over-consolidation ratio
C. normally consolidated clay
D. under-consolidated clay

A

A. over-consolidated clay with a high over-consolidation ratio

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5
Q

the compression index of a soil…

A. decreases with an increase in the liquid limit
B. increases with an increase in the liquid limit
C. decreases with an increase in the plastic limit
D. is not related with plastic limit

A

B. increases with an increase in the liquid limit

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6
Q

sensitivity of a soil can be defined as _____

A. percentage of volume change of soil under saturated condition

B. ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

C. ratio of volume of voids to volume of solids

D. none of the above

A

B. ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

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7
Q

a soil not fully consolidated under the existing over-burden pressure is called _____

A. pre-consolidated
B. normally consolidated
C. over-consolidated
D. none of these

A

C. over-consolidated

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8
Q

the reduction in volume of soil due to squeezing out of water from the voids is termed _____

A. primary consolidation
B. primary compression
C. primary time effect
D. all the above

A

D. all the above

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9
Q

if a soil undergoes a change in shape and volume by application of external loads over it, but recovers its shape and volume immediately after removal of the load, the property of the soil is said to be _____

A. resilience of soils
B. elasticity of soils
C. compressibility of soils
D. none of these

A

B. elasticity of soils

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10
Q

coefficient of compressibility is _____

A. constant for any type of soil

B. different for different types of soils and also different for a soil under different states of consolidation

C. different for different types of soils but same for a soil under different states of consolidation

D. independent of type of soil but depends on the stress history of soil

A

B. different for different types of soils and also different for a soil under different states of consolidation

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11
Q

select the correct statement:

A. coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay

B. coefficient of compressibility of an over-consolidated clay is greater than that of a normally consolidated clay

C. coefficient of compressibility is constant for any clay

D. none of the above

A

A. coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay

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12
Q

over-consolidation of soils is caused due to _____

A. erosion of over burden
B. melting of ice sheets after glaciations
C. permanent rise of water table
D. all the above

A

D. all the above

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13
Q

the compressibility of clays is caused due to _____

A. expulsion of double layer water from in between the grains
B. slipping of particles to new positions of greater density
C. bending of particles as elastic sheets
D. all the above

A

D. all the above

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14
Q

compressibility of sandy soils is _____

A. almost equal to that of clayey soils
B. much greater than that of clayey soils
C. much less than that of clayey soils
D. none of the above

A

C. much less than that of clayey soils

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15
Q

the maximum value of effective stress in the past divided by the present value is defined as over consolidation
ratio (OCR); the O.C.R. of an over consolidated clay is _____

A. less than 1
B. 1
C. more than 1
D. none of these

A

C. more than 1

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16
Q

the ultimate settlement of a soil is directly proportional to _____

A. depth of the compressible soil strata
B. compressive index
C. void ratio
D. both A and B

A

D. both A and B