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Code No: CE504 OR

IV B.Tech(CCC) Regular Examinations, December 2007GROUND IMPORVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 hours Max Marks:100Answer any FIVE Questions

All 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. [20]

2. Write a detailed note on installation of stone column and explain load sharingmechanism in stone columns. [20]

3. (a) Explain any two grouting techniques. [10+10]

(b) Explain any three engineering application of grouting which proves to be ef-fective?

4. (a) Explain the basic mechanism of reinforced Earth. [10+10]

(b) How is soil selected in reinforced earth application? What are the popularreinforcing materials? Explain briefly.

5. (a) List the major functions that the Geotextiles are intended to perform. [10+10]

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

6. (a) “The swelling soils of India are called by the name Black Cotton soils”. Whatis the reason for these soils to be called as Black cotton soils? Due to whatreasons Black Cotton soils are considered as expansive soils. [10+10]

(b) State the parts or regions covered by Black Cotton soils in India.

7. (a) List out the types of laboratory tests available to determine compaction prop-erties? Explain in detail one of the laboratory test. [10+10]

(b) Explain triangular chart method of blending of aggregates.

8. Describe the conventional methods of construction of lime soil stabilization. [20]

⋆ ⋆ ⋆ ⋆ ⋆

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Code No: C4CE25 05

IV B.Tech.(CCC) Regular Examinations, December 2008GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 100

Answer any FIVE QuestionsAll Questions carry equal marks

? ? ? ? ?

1. (a) Explain the objectives of Densification in Cohesionless soils.

(b) Describe “Vibroflotation Technique” used in densification of Granular soilswith neat sketches. [8+12]

2. (a) Explain how densification can be achieved by providing vertical drains. Listdifferent vertical drains that can be used in saturated cohesive soils.

(b) What is a “Sand Drain”? How is it constructed and is useful in densifyingcohesive soil deposits? Explain Drain Resistance and Smear effect in relationto the drain. [8+12]

3. (a) Describe External and Internal Stability Mechanisms to be considered in de-sign of Reinforced Earth Retaining Walls with neat sketches.

(b) List out the applications of Reinforced Earth. [12+8]

4. (a) Describe Physical and Mechanical properties of Geotextiles.

(b) List out the applications of geotextiles based on separation and Reinforcementfunctions. [10+10]

5. (a) What is an expansive soil? How the expansive soils are formed in natureexplain clearly.

(b) What are the typical range of values of Atterberg limits, percentage of clayfraction and colloid content in expansive soils? [10+10]

6. (a) Explain various types of rollers used in the field compaction.

(b) What are the factors affecting compaction? Discuss in detail. [10+10]

7. (a) Explain the soil-cement mix design procedure and what are the factors affectthe soil-cement stabilization.

(b) Discuss the plant mix method for the construction of soil-cement base course.[10+10]

8. (a) Discuss on types of limes and their suitability in stabilizing soils.

(b) What are the chemical and physical changes takes place in lime stabilizationand discuss the construction methods used in lime stabilization. [10+10]

? ? ? ? ?

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Code No: CE504 OR

IV B.Tech.(CCC) Supplimentary Examinations, December 2008GROUND IMPORVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 100

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. [20]

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. [20]

3. (a) What is grouting? Explain in detail the methods of grouting? [10+10]

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

4. (a) Explain the basic mechanism of reinforced Earth. [10+10]

(b) How is soil selected in reinforced earth application? What are the popularreinforcing materials? Explain briefly.

5. (a) Explain the construction procedure, in detail, for using the Geotextiles asreinforcement in the construction of embankments. [10+10]

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

6. (a) Discuss the consequences of swelling on structures. [10+10]

(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. [20]

8. How the designs of soil-lime mixtures are carried out during stabilization? [20]

? ? ? ? ?

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Code No: C4CE25 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Examinations February-2011 GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 Hours Max.Marks:100 Answer Any Five Questions

All Questions Carry Equal Marks - - -

1. a) Distinguish between Blasting and Pounding Methods used in densification of sandy soils. b) What is a ‘Vibroflot’? How is it used in densification of granular soils? [20] 2. a) Describe the method of installation of Synthetic (Strip) Drains Using STITCHER. What are the advantages of strip drains over sand drains? b) What is a ‘Stone Column’? Explain its Functions. [20] 3. a) What are the relative merits and demerits of Reinforced Earth walls over Conventional retaining walls? b) Explain the need for reinforcing soils. How does reinforcement improves strength of soil? [20] 4. a) Discuss relative merits and demerits of Geotextiles and Geogrids. b) List out the applications of geotextiles based on Drainage and Reinforcement Functions. [20] 5. a) The swelling soils of India are called by the name Black cotton soils. What are reasons for calling these soils are black cotton soils? b) How the swelling pressure of soil is determined in the laboratory. [20] 6. a) Discuss about field compaction control methods. b) Explain the principle and application of mechanical soil stabilization. [20] 7. a) State the properties of cement-stabilized earth and explain the effect of additives in modifying the basic properties of soil-cement. b) What are the steps involved in the design soil-cement mix? Discuss. [20] 8. a) Discuss the use of bitumen as a stabilizer for cohesive and non-cohesive soils. Bring out the differences between the two. b) Enumerate the construction procedure of lime stabilized base course. [20]

*****

NR

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Code No: CE504 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Examinations February-2011 GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 Hours Max.Marks:100 Answer Any Five Questions

All Questions Carry Equal Marks - - -

1. a) Explain in detail the in-situ densification methods in granular soils. b) How to compact the granular soil deposits by using the techniques of vibration at the ground surface and impact at the ground surface. [20] 2. a) Explain in detail about the dewatering techniques used in cohesive soils. b) What is meant by Smear? Explain in detail the effect of Smear. [10+10] 3. a) Describe different grouting techniques depending upon the stabilizer used? b) Write a note on suspension and solution grouting. [10+10] 4. a) Design a reinforced earth wall for retaining a 6metre high cohesion less soil. The soil in the wall and backfill has density of 18KN/m3 with angle of internal friction of 35 degrees. The allowable soil pressure is 150KN/m2. Use galvanized strips as reinforcement? b) Explain the principle involved in the reinforced earth. [14+6] 5. a) What are the advantages of using Geotextiles as separators over using a single or multiple soil filters. b) Discuss how soil filters are disadvantageous over Geotextiles if necessary support your reasoning through sketches. [10+10] 6. a) Can chemical stabilization of expansive soil take care of all expansive soil problems - discuss. b) Can an under reamed pile foundation system provide a foolproof solution to the problem of expansive soils - Discuss. [10+10] 7. a) List the factors which affect the compactive effort of [12+8] i) A pneumatic tired roller. ii) A vibrating roller. b) Explain the difference between compaction and consolidation in soil mechanics. 8. a) Define the term soil stabilization. b) What are the broad classifications of soil Stabilization? c) What is the purpose of soil stabilization? d) State the different techniques available. [20]

*****

OR

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Code.No: C4CE25 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Examinations January 2010 GROUND IMPROVEMENT TECHNIQUES

(CIVIL ENGINEERING) Time : 3 Hours Max. Marks :100

Answer Any Five Questions All Questions Carry Equal Marks

- - - 1.a) Distinguish between Blasting and Pounding methods used in densification of

sandy soils. b) What is a ‘Vibroflot’? How is it used in densification of granular soils? [10+10] 2.a) What is a ‘stone column’? How is it constructed? How is it useful in densifying

saturated cohesive soils? b) Explain the terms ‘Smear Effect’ and Drain Resistance’ in relation to vertical

drains. Mention the methods of minimizing them in drains. [10+10] 3. Explain the concept of Reinforced Earth. Mention various reinforcing materials that

can be used in soils. What are their merits and demerits. [20] 4. Distinguish between: a) In plane permeability and Cross Plane permeability of geotextiles. b) Geogrids and Geotextiles. c) Weight and specific gravity of geotextiles. [20] 5.a) How the swell pressure of soil is determine in the laboratory? b) What are the field conditions that generally favour swelling in expansive soil. What are the consequences of swelling on structures? [10+10] 6. Explain the principle, application and method of construction of mechanical soil

stabilization. [20] 7. Discuss the problems in stabilization of: a) Black cotton soils and b) Desert sands. Suggest suitable method of stabilization and construction methodology. [20] 8. Discuss the principles and application of soil-bitumen. What are the factors

affecting the properties of soil bitumen? [10+10]

*****

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JNTUWORLD

Code No: CE504

IV B.Tech(CCC) Regular Examinations, January 2010GROUND IMPROVEMENT TECH.

Civil EngineeringTime: 3 hours Max Marks: 100

Answer any FIVE QuestionsAll Questions carry equal marks

? ? ? ? ?

1. Write explanatory notes on the following in detail: [20]

(a) Sand drains.

(b) Sandwitch geodrains.

2. (a) List the major functions that the Geotextiles are intended to perform. [10+10]

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

3. (a) List the factors which affect the compactive effort of [12+8]

i. A pneumatic tired roller.

ii. A vibrating roller.

(b) Explain the difference between compaction and consolidation in soil mechan-ics.

4. (a) Explain in detail the in-situ densification methods in granular soils. [20]

(b) How to compact the granular soil deposits by using the techniques of vibrationat the ground surface and impact at the ground surface.

5. (a) Based on the swelling pressure of different clays, how do you judge the expan-sive nature of these clay soils. [10+10]

(b) Describe the procedures for determining the swelling pressure of clays as perI.S procedure.

6. (a) Explain in detail soil stabilisation by grouting? [10+10]

(b) Describe the equipment used in grouting technique.

7. (a) Explain the basic mechanism of reinforced Earth. [10+10]

(b) How is soil selected in reinforced earth application? What are the popularreinforcing materials? Explain briefly.

8. A road is being constructed in a stretch of 20 km, 5km of which has black cottonsoil as subgrade and 6 Km of which is a granular strata with high water tableconditions. Which methods of stabilization would you prefer in the two strata?Justify. [20]

? ? ? ? ?

1

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JNTUWORLD

Code. No: C4CE25 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Supplementary Examinations July/August - 2010 GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 Hours Max.Marks:100 Answer Any Five Questions

All Questions Carry Equal Marks - - -

1. a) Mention different in-situ densification methods for granular soils. b) Distinguish between Vibroflotation and Terra Probe Methods of densifying loose deposits of sand. [8+12] 2. a) What is the effect of vertical drains of Primary and Secondary Consolidation of soils? Name different vertical drains. b) Write short note on densification of cohesive soils by Lime Columns. [10+10] 3. a) Distinguish between Metallic and Synthetic Reinforcements used in soil. b) Describe different types of Facings used in Reinforced Earth Retaining Walls. [10+10] 4. Explain the Functions of Geotextiles. Give applications based on any two Functions. [20] 5. a) What are the tests available to determine the swelling pressure of expressive soil? Describe briefly with a neat sketch any one of them. b) What are the foundation techniques available for different structures to be constructed in expansive soils? Describe any one of them in detail. [10+10] 6. a) Explain how the quality of compaction is monitored in the field. b) Explain the proportioning of materials by Rothfuch’s method. [10+10] 7. a) Discuss in detail the construction of soils-cement stabilization. b) Discuss the various protection techniques for joints with neat sketches in soil- cement road construction. [10+10]

8. a) Name the types of bitumen available to be used as stabilizers of soil and state their properties. b) Explain the influence of quantity of bitumen used and its mixing on the performance of soil-bitumen. [10+10]

******

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JNTUWORLD

Code. No: CE504 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Supplementary Examinations July/August - 2010 GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 Hours Max.Marks:100 Answer Any Five Questions

All Questions Carry Equal Marks - - -

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

typical characteristics and the relative effectiveness of both the terms. [20] 2. What are the different techniques used to follow to achieve the densification of deep

soil deposits? Explain with the help of sketches. [20] 3. (a) Explain any two grouting techniques. [10+10] (b) Explain any three engineering application of grouting which proves to be effective? 4. (a) Explain the basic mechanism of reinforced Earth. (b) How is soil selected in reinforced earth application? What are the popular reinforcing materials? Explain briefly. [10+10] 5. (a) Describe the general procedure of placing Geotextile in back fill soil of a retaining

wall. (b) State some important hydraulic and durability properties of Geotextiles. [10+10] 6. (a) Discuss the field conditions that generally favour swelling in expansive soil. (b) Define the terms, ‘Free Sweell’, ‘Differential Free Swell’, ‘Swelling Pressure’ and ‘Field moisture content’ [10+10] 7. (a) Explain Rothfutch’s graphical method of mixing aggregates. (b) Explain in detail Laboratory compaction test? Give the typical data obtained in this test and give computational steps and interpretation of the results. [10+10] 8. A road is being constructed in a stretch of 20 km, 5km of which has black cotton soil as subgrade and 6 Km of which is a granular strata with high water table conditions. Which methods of stabilization would you prefer in the two strata? Justify. [20]

*****

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Code No: CE504 OR

IV B.Tech.(CCC) Supplimentary Examinations, June 2008GROUND IMPORVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 100

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. [20]

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. [20]

3. (a) Describe different grouting techniques depending upon the stabiliser used?[10+10]

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

4. (a) Explain the components of reinforced earth. [10+10]

(b) State and explain the factors governing the design of reinforced earth wall?

5. (a) List the major functions that the Geotextiles are intended to perform. [10+10]

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

6. (a) Discuss the consequences of swelling on structures. [10+10]

(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. [20]

8. Describe the different steps involved in the process of soil stabilization. ExplainLime-Soil reactions. [20]

? ? ? ? ?

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Code No: C4CE25 N5

IV B.Tech.(CCC) Supplimentary Examinations, June 2009GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 100

Answer any FIVE QuestionsAll Questions carry equal marks

? ? ? ? ?

1. (a) Explain the objectives of Densification in Cohesionless soils.

(b) Describe “Vibroflotation Technique” used in densification of Granular soilswith neat sketches. [8+12]

2. Write Short notes on:

(a) Effect of Drains on Primary and Secondary consolidation of soils

(b) Thermal Methods of Densifying soils. [10+10]

3. What is Reinforced Earth? Explain different Reinforced Earth Structures with neatsketches. [20]

4. (a) Describe Physical and Mechanical properties of Geotextiles.

(b) List out the applications of geotextiles based on separation and Reinforcementfunctions. [10+10]

5. (a) What is Cohesive-Non Swelling layer? When do you use it and what are itslimitations?

(b) Discuss the principle and functioning of under-reamed piles. [10+10]

6. (a) Explain the proportioning of materials by Rothfuch’s method.

(b) Write notes on field compaction control. [10+10]

7. Describe the basic principles involved in successful stabilization of :

(a) sand

(b) inert clay and

(c) expansive soil. [20]

8. Discuss the bituminous stabilization in detail and what are the factors affecting onbituminous stabilization. [20]

? ? ? ? ?

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Code No: CE504 OR

IV B.Tech.(CCC) Supplimentary Examinations, June 2009GROUND IMPORVEMENT TECHNIQUES

(Civil Engineering)Time: 3 hours Max Marks: 100

Answer any FIVE QuestionsAll Questions carry equal marks

? ? ? ? ?

1. (a) List the objectives of compacting soil and explain the purpose compaction.[10+10]

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

2. (a) Explain in detail about the dewatering techniques used in cohesive soils.[10+10]

(b) What is meant by Smear? Explain in detail the effect of Smear.

3. (a) Explain any two grouting techniques. [10+10]

(b) Explain any three engineering application of grouting which proves to be ef-fective?

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

(b) Describe the procedure of desining a reinforced earth wall? [10+10]

5. (a) Out line a general procedure for placing the Geotextile fabrics for reinforcingthe road sub grades. [10+10]

(b) How does the geotextile increase the bearing capacity of foundation soil?

6. (a) Based on the swelling pressure of different clays, how do you judge the expan-sive nature of these clay soils. [10+10]

(b) Describe the procedures for determining the swelling pressure of clays as perI.S procedure.

7. What is meant by dynamic compaction? Explain in detail the procedure of con-ducting laboratory test of compaction. [20]

8. Discuss in detail the various methods of lime addition to soils practical usage inengineering construction. [20]

? ? ? ? ?

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ni.ac.i

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Code. No: C4CE25 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B.Tech (CCC) IV Year Supplementary Examinations July/August - 2010 GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)

Time: 3 Hours Max.Marks:100 Answer Any Five Questions

All Questions Carry Equal Marks - - -

1. a) Mention different in-situ densification methods for granular soils. b) Distinguish between Vibroflotation and Terra Probe Methods of densifying loose deposits of sand. [8+12] 2. a) What is the effect of vertical drains of Primary and Secondary Consolidation of soils? Name different vertical drains. b) Write short note on densification of cohesive soils by Lime Columns. [10+10] 3. a) Distinguish between Metallic and Synthetic Reinforcements used in soil. b) Describe different types of Facings used in Reinforced Earth Retaining Walls. [10+10] 4. Explain the Functions of Geotextiles. Give applications based on any two Functions. [20] 5. a) What are the tests available to determine the swelling pressure of expressive soil? Describe briefly with a neat sketch any one of them. b) What are the foundation techniques available for different structures to be constructed in expansive soils? Describe any one of them in detail. [10+10] 6. a) Explain how the quality of compaction is monitored in the field. b) Explain the proportioning of materials by Rothfuch’s method. [10+10] 7. a) Discuss in detail the construction of soils-cement stabilization. b) Discuss the various protection techniques for joints with neat sketches in soil- cement road construction. [10+10]

8. a) Name the types of bitumen available to be used as stabilizers of soil and state their properties. b) Explain the influence of quantity of bitumen used and its mixing on the performance of soil-bitumen. [10+10]

******

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