JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV GROUND IMPROVEMENT TECHNIQUES Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Write the importance of consistency index in soil modification.
Answer
The consistency index indicates the relative firmness of cohesive soils. It is essential in soil modification to determine the soil's state of consistency, helping to assess its workability, shear strength, and potential for volume change during stabilization processes.
List out any three objectives of ground improvement.
Answer
- To increase the bearing capacity of the soil.
- To reduce the settlement of structures.
- To control the permeability and seepage characteristics of the soil.
What is shallow compaction?
Answer
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When do you prefer stone column technique?
Answer
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What is dewatering?
Answer
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Write the importance of vertical drains in improvement of soft clay.
Answer
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List out various admixtures used in stabilization of soil.
Answer
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Write about ground freezing.
Answer
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When do you prefer soil nailing?
Answer
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List out the uses of ground anchors.
Answer
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Part B
How do you say a soil is required to be modified? Explain.
Answer
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What is reclaimed soil? What are the characteristics of these soils?
Answer
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Generally we do conduct grain size analysis and Atterberg limits tests in the laboratory. Discuss their importance in ground improvement.
Answer
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Discuss various strategies developed to optimize the densification process of soil.
Answer
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When do you prefer Vibro-Compaction and Dynamic Compaction techniques? Discuss with neat sketches how soil is improved by these methods.
Answer
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What is the principle of blasting? Discuss how soil is improved by the blasting method.
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What are compaction piles? Discuss how soil is improved by the method of compaction piles.
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What are the main functions of Geo-textile and Geo-grid and explain them in brief? Also explain the following:
- Physical properties of Geo-textiles
- Burst strength of geo-textile
- Durability of geo-textile
- Seam strength of geo-textile.
Answer
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Discuss with neat sketches the following pre-drainage methods: i) Well points and ii) Vacuum wells.
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Discuss any two selection criteria of filler material around drains.
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What do you understand soil stabilization by grouting? Explain in detail various field of applications of grouting.
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Describe the equipment used in grouting technique.
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What is bituminous stabilization? Discuss the necessary requirements to achieve best results in soil-bitumen stabilization.
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Discuss the behavior of liquid limit and plastic limit of clay soil when treated with lime.
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Explain the basic mechanisms and applications of soil nailing.
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Write the applications and advantages of reinforced earth with sketches.
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Stating the assumptions, explain design steps of reinforced earth wall with clear illustrations.
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