Scanned by CamScanner notes/CIVIL/III/Ground improvemen… · usually adopted for ground improvement. 3. Thermal process is used for ground improvement in _____ 4. Compaction grouting

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UNIT I

FILL IN THE BLANKS

1. Modification of engineering properties of soil using various techniques for constructional

purpose is known as_________________or_________________

2. In soils with high water content of ground water table _________________ methods are

usually adopted for ground improvement.

3. Thermal process is used for ground improvement in ______________________

4. Compaction grouting is adopted for modification of _____________________ soil.

5. ___________________is the most commonly used admixture for ground improvement

techniques.

MULTIPLE CHOICE

1. Compaction by impact roller is not effective for __________________

(a) Wet sand (b)Dry sand (c) Rubble fill (d) Unsaturated clay

2. The speed of a typical depth vibrator

(a) 20 Hz (b) 30 Hz (c) 200 rpm (d) 2000 rpm

3. The minimum number of passes recommended for economical use of vibratory rollers.

(a) 2-3 passes (b) 3-4 passes (c) 4-6 passes (d) 6-8 passes

4. The efficiency of a static roller depends on

(a) Wheel load and wheel diameter (b) Gross weight and inflation pressure

(c) Tire width and size (d) All the above

5. Static rollers are most suitable for

(a) Coarse grained soils (b) Weathered rock

(c) Saturated soils (d) Fine grained soils (> 20%)

KEY

FILL IN THE BLANKS

1. Ground improvement, Ground modification

2. Consolidation

3. Clayey soils with organic content

4. Loose cohesion less soils

5. Cement

MULTIPLE CHOICE

1)b 2)d 3)c 4)d 5)d


















UNIT II

FILL IN THE BLANKS

1._________________ is the most commonly used mechanical method of ground

modification.

2. Ground modification by static or dynamic pressure (preloading or impact) is known as

_____________

3. Soil densification by expulsion of water is termed as_____________

4. _____________helps in selection of most economical equipment for compaction or

mechanical modification.

5. Modification of coarse grained soils that also contain fines is small quantity, is most

effective with _________________

6. Sub-surface horizontal vibration is associated with ______________ technique of ground

modification.

7. _____________ is the best mechanical method of modification for sands.

MULTIPLE CHOICE

1. The depth (D), to which tamping is effective, depends on

(i) Mass of falling weight (w) (ii) Height of fall (H)

(a) Only (i)

(b) Only (ii)

(c) Both (i) and (ii)

(d) None

2. Which among the following is the most effective method of compaction for clayey soils.

(a) Preloading method (b) Static sheepsfoot roller

(c) Impact roller (d) Grid rollers

3. For compaction in large and remote areas, most economical method recommended is

(a) Dynamic compaction (b) Static compaction

(c) Vibro flotation (d) Explosions

4. Use of lime admixture with a soil generally causes

(a) Increases in maximum dry density ɤdmax

(b) Decrease in ɤdmax and optimum water content

(c) Decrease in ɤdmax and increase in optimum water content

(d) Increase in ɤdmax and decrease in optimum water content

5. Grid rollers are mostly suitable for

(a) Poorly graded soils (b) Clayey soils

(c) Weathered rock and well graded soils (d) Fine grained soils

6. Vibro-replacement is best suited for

(a) Sandy soils (b) Clayey soils

(c) Silts and fine grained soils (d) Mine soils and silty sands

7. Dynamic compaction can he used for compaction of soils for depths up to

(a) 10 m (b) 20 m (c) 30 m (d) 40 m

8. Which of the following factors affect the compaction of a soil for standard proctor test

1. Moisture content 2. Type of soil 3. Compaction effort 4. Porosity

(a) 1, 2 & 3 (b) I, 2 & 4 (c) 2, 3 & 4 (d) 2 & 3

9. To achieve maximum compaction, the number of passes required in coarse grained soils

when sheepsfoot roller used

(a) 4-6 (b) 6-8 (c) 8-10 (d) 10-12

KEY

FILL IN THE BLANKS

1. Compaction

2. Surface compaction

3. Consolidation

4.Production rate

5. Rubber tired rollers

6. Vibro flotation

7. Vibro compaction

MULTIPLE CHOICE

1) b 2)d 3)d 4)c 5)c

6)d 7)c 8)c 9)b

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Scanned by CamScanner notes/CIVIL/III/Ground improvemen… · usually adopted for ground improvement. 3. Thermal process is used for ground improvement in _____ 4. Compaction grouting