r5410110 Ground Improvement Techniques

Code No: R5410110 1IV B.Tech I Semester(R05) Supplementary Examinations, May/June 2009

GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

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1. Explain the terms Vibro-Compaction and Vibro-Replacement, highlighting the typical charac-

teristics and the relative effectiveness of both the terms. [16]

2. What other design or construction alternatives would be considered besides soil

improvement such as compaction in order to overcome a difficult foundation problem? Explain

in detail. [16]

3. (a) Explain in detail soil stabilisation by grouting? [8+8]

(b) Describe the equipment used in grouting technique.

4. (a) Explain any four engineering application of reinforced earth with sketches?

[8+8]

(b) Describe the procedure of desining a reinforced earth wall?

5. (a) Describe the general procedure of placing Geotextile in back fill soil of a retaining wall.

[8+8]

(b) State some important hydraulic and durability properties of Geotextiles.

6. (a) Discuss the consequences of swelling on structures. [8+8]

(b) Discuss and state how these two parameters.

i. swelling potential and

ii. plasticity index are related.

7. What is meant by dynamic compaction? Explain in detail the procedure of conducting labo-

ratory test of compaction. [16]

8. Describe the different steps involved in the process of soil stabilization using lime as additive.

What are the different types of Limes? [16]

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(Civil Engineering)




? ? ? ? ?

1. Explain the terms Vibro-Compaction and Vibro-Replacement, highlighting the typical charac-

teristics and the relative effectiveness of both the terms. [16]

2. What other design or construction alternatives would be considered besides soil

improvement such as compaction in order to overcome a difficult foundation problem? Explain

in detail. [16]

3. (a) Explain any two grouting techniques. [8+8]

(b) Explain any three engineering application of grouting which proves to be effective?

4. (a) Explain the basic mechanism of reinforced Earth. [8+8]

(b) How is soil selected in reinforced earth application? What are the popular

reinforcing materials? Explain briefly.

5. (a) List the major functions that the Geotextiles are intended to perform. [8+8]

(b) Explain how Geotextiles can be used as separators.

6. (a) Give approximate but reasonable values of Liquid Limit, plasticity Index, shrinkage limit

and the percentage of minus 2 micron fraction for the Black Cotton soils. [8+8]

(b) Discuss the various remedial measures to be adopted in providing foundations in expansive

soils.

7. Write short note on [16]

(a) Sheep foot Rollers

(b) Smooth wheel roller

(c) Vibratory Rollers

(d) Field compaction control.

8. (a) Enumerate and describe the various types of lime used in the stabilization of soils. Arrange

them in the order of effectiveness. [8+8]

(b) Explain in detail the soil lime reactions. What is its effect on soil properties?

? ? ? ? ?



(Civil Engineering)




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1. (a) List the objectives of compacting soil and explain the purpose compaction.

[8+8]

(b) What are the strategies developed for optimizing the densification process?

2. Write a detailed note on installation of stone column and explain load sharing

mechanism in stone columns. [16]

3. (a) Describe different grouting techniques depending upon the stabiliser used?

[8+8]

(b) Write a note on suspension and solution grouting.




5. (a) Explain the construction procedure, in detail, for using the Geotextiles as reinforcement

in the construction of embankments. [8+8]

(b) State the major design steps in the design of Geotextile-reinforced walls.

6. (a) Discuss the consequences of swelling on structures. [8+8]

(b) Discuss and state how these two parameters.

i. swelling potential and

ii. plasticity index are related.

7. What is meant by dynamic compaction? Explain in detail the procedure of conducting labo-

ratory test of compaction. [16]

8. What is soil stabilization? And what are the different methods of soil stabilization? Explain.

[16]

? ? ? ? ?



(Civil Engineering)




? ? ? ? ?

1. (a) List the objectives of compacting soil and explain the purpose compaction.

[8+8]

(b) What are the strategies developed for optimizing the densification process?

2. Explain in detail with the help of sketches. The preloading method of ground

improvements. [16]

3. (a) Explain any two grouting techniques. [8+8]

(b) Explain any three engineering application of grouting which proves to be effective?




5. (a) Discuss the commonly adopted tests for Geotextiles. [8+8]

(b) Describe the different forms of Geogrids and state their functions in the stabilization of

soils.

6. (a) How are the foundations constructed in expansive soils, effected. [8+8]

(b) Distinguish between soft clays and expansive soils. Which soil is relatively better?

7. Find the proportions of the materials A, B, and C by the Rothfuch?s method so that the mix-

tures may approximate to the desired grading using the data given below.

[16]

I.S.Sieve % Passing

Desired Grading Materials A Materials B Materials C

40mm 100 95 – –

20mm 85-100 70 – –

10mm 65-100 21 – –

4.75mm 55-85 11 100 –

2.36mm 40-70 7 85 –

425micron 25-45 2 55 –

75micron 10-25 Trace Nill 100

8. What is soil stabilization? And what are the different methods of soil stabilization? Explain.

[16]

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r5410110 Ground Improvement Techniques