JNTU
JNTU B.Tech IV GROUND IMPROVEMENT TECHNIQUES Previous Question Paper (July - 2023 - R16)
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
How do you assess a soil is loose or dense?
Answer
The density of soil is assessed primarily through field tests such as the Standard Penetration Test (SPT) or Cone Penetration Test (CPT). A low N-value from SPT (typically less than 10) indicates loose soil, while a high N-value (greater than 30) indicates dense soil. Relative density (Dr) is also used for granular soils, where Dr < 30% denotes loose and Dr > 70% denotes dense soil.
What are the treatment methods of cohesive soils?
Answer
Treatment methods for cohesive soils include: 1) Preloading with vertical drains (PVDs) to accelerate consolidation, 2) Stabilization using chemical additives like lime or cement, 3) Electro-osmosis to induce water flow in low-permeability clays, and 4) Thermal stabilization or vacuum consolidation.
Write the limitations of vibro compaction method.
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Write a note on bottom feed method of stone column.
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Write the limitation of electro osmosis method in treating soil.
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When do you prefer well point system?
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What is the chemical composition in fly ash?
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Write the benefits of soil - cement stabilization.
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When do you prefer shotcreting? Write its importance.
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What is gabion wall? Write its limitations.
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Part B
With what objectives would you propose ground improvement? Write the benefits that can be derived from the improved ground.
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Based on the grain size, explain classification of ground improvement methods.
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Write the characteristics of difficult soils and explain how do you estimate density index of cohesionless soil.
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What is consistency of clay? Discuss various consistency of clay with liquidity index.
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Discuss the installation of vibro stone column in the natural ground.
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Explain advantages and limitations of vibro stone column method.
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When do you prefer dynamic compaction? Discuss process of dynamic compaction in the field.
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Write the benefits and limitations of dynamic compaction.
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What are the objectives of dewatering? Discuss the construction and advantages of preloading with wick drains.
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Explain vacuum system of dewatering.
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Differentiate gravity and well point systems of dewatering. Also discuss the different drains and their purpose in civil constructions.
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Explain basic principles of design of well point system.
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What are the objectives of grouting of soil? Discuss compaction grouting and permeation grouting methods.
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What is soil stabilization? Explain the benefits that can be derived from soil stabilization.
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Explain process of lime stabilization of soil. Also discuss the soil-lime reaction which impart improvement in soil.
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Discuss the applications of grouting of soil.
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What is soil nailing? Discuss its stage-by-stage installation process with neat sketches.
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Explain how do you ensure quality of soil nailed ground?
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What is soil reinforcement? What are the different materials used in soil reinforcement technique? Discuss the instances when you prefer different reinforcement materials.
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