Rr410111 Ground Improvement Techniques

8/2/2019 Rr410111 Ground Improvement Techniques

1/6

Code No: RR410111 Set No. 1

IV B.Tech I Semester Regular Examinations, November 2006GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

1. Explain the terms Vibro-Compaction and Vibro-Replacement, highlighting the typ-ical characteristics and the relative effectiveness of both the terms. [16]

2. Explain in detail the in-situ densification methods in cohesive soils. [16]

3. (a) Describe different grouting techniques depending upon the stabiliser used?[8+8]

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

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. What are the different tests conducted on Geotextile materials and what properties

are evaluated from these tests. Explain any one test procedure. [16]

6. (a) Give approximate but reasonable values of Liquid Limit, plasticity Index,shrinkage limit and the percentage of minus 2 micron fraction for the BlackCotton soils. [8+8]

(b) Discuss the various remedial measures to be adopted in providing foundationsin expansive soils.

7. Find the proportions of the materials A, B, and C by the Rothfuch?s method sothat the mixtures may approximate to the desired grading using the data givenbelow.

[16]

I.S.Sieve % PassingDesired 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. (a) Define the term soil stabilization. [4X4=16]

1 of 2


2/6


(b) What are the broad classification of soil Stabilization.

(c) What is the purpose of soil stabilization.(d) State the different techniques available.

2 of 2


3/6





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. What other design or construction alternatives would be considered besides soilimprovement such as compaction in order to overcome a difficult foundation prob-lem? Explain in detail. [16]

3. (a) What is grouting? Explain in detail the methods of grouting? [8+8]

(b) Explain in detail various field of applications of grouting.

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

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

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. Find the proportions of the materials A, B, and C by the Rothfuch?s method sothat the mixtures may approximate to the desired grading using the data givenbelow.

[16]

I.S.Sieve % PassingDesired 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

1 of 2


4/6


8. Discuss in detail the various methods of lime addition to soils practical usage inengineering construction. [16]

2 of 2


5/6






2. (a) How could the stress history of a soil deposit affect its suitability for preloadingwith vertical drains? [8+8]

(b) How can you measure the settlement of the original ground and after theplacing of say 5m of fill?



4. (a) Design a reinforced earth wall for retaining a 6metre high cohesionless soil.The soil in the wall and backfill has density of 18KN/m3 with angle of in-ternal friction of 35 degrees. The allowable soil pressure is 150KN/m2. Use

galvanized strips as reinforcement? [12+4]

(b) Explain the principle involved in the reinforced earth.

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) 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 con-ducting laboratory test of compaction. [16]

8. Discuss in detail the various methods of lime addition to soils practical usage inengineering construction. [16]

1 of 1


6/6






2. What other design or construction alternatives would be considered besides soilimprovement such as compaction in order to overcome a difficult foundation prob-lem? Explain in detail. [16]



4. (a) Design a reinforced earth wall for retaining a 6metre high cohesionless soil.The soil in the wall and backfill has density of 18KN/m3 with angle of in-ternal friction of 35 degrees. The allowable soil pressure is 150KN/m2. Usegalvanized strips as reinforcement? [12+4]

(b) Explain the principle involved in the reinforced earth.

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

(b) Describe the different forms of Geogrids and state their functions in the sta-bilization of soils.

6. (a) Discuss the field conditions that generally favour swelling in expansive soil.[8+8]

(b) Define the terms, Free Sweell, Differential Free Swell, Swelling Pressureand Field moisture content

7. What is meant by dynamic compaction? Explain in detail the procedure of con-ducting laboratory test of compaction. [16]

8. (a) Describe Soil bitumen, Sand bitumen and Oiled earth. [8+8]

(b) Explain the phenomenon of soil bitumen stabilization

1 of 1

Documents

Rr410111 Ground Improvement Techniques