JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year EARTH AND ROCK FILL DAMS AND SLOPE STABILITY 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
What is significance of pore water pressure in the design of earthen dam?
Answer
Pore water pressure significantly reduces the effective stress within the dam material, directly lowering the shear strength of the soil. It is a critical parameter in stability analysis, as high pore pressures during construction or rapid drawdown can lead to slope failure.
What are earthen dams and when they preferred?
Answer
Earthen dams are structures constructed primarily of compacted soil, sand, gravel, or rock fill. They are preferred when the foundation is relatively weak or compressible, where concrete dams would be uneconomical, or when local materials are readily available for construction.
What are the causes of failures of earthen dam?
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What are the advantages of filters in the dam?
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Differentiate finite slope and infinite slope.
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Define critical surface of failure.
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What are the different factor of safety used in the stability of slope?
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What do you mean by tension crack?
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Explain the importance of relief wells.
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What is the importance of chimney drain?
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Part B
Explain the method of checking the stability of earth dam foundation against shear failure.
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Explain with the help of a sketch the components of a zoned embankment dam, with their functions.
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Derive the equation for the phreatic surface for an earth dam.
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Sketch out sections of earth dam to suit various conditions of available materials and existing foundation conditions.
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Explain the method of stability analysis of d/s slope during steady seepage.
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Explain the method of plotting the flow net for seepage through anisotropic soil.
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Explain the method of stability analysis of u/s slope during sudden drawdown.
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Derive Laplace equation for seepage through the homogeneous mass of an earth dam.
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An infinite slope having an inclination of 36° made up of clay with following properties: γ = 18 kN/m³, γ' = 9 kN/m³, C' = 25 kN/m², φ' = 28°. If the height of the slope is equal to 12m, determine the stability of the slope, when (a) When soil is dry. (b) When the water seeps parallel to the surface of the slope.
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A slope of very large extent of soil with properties C' = 0 and φ' = 32° is likely to be subjected to seepage parallel to the slope with water level at the surface. Determine the maximum angle of slope for a factor of safety of 1.5 treating it as an infinite slope. For this angle of slope, what will be the factor of safety if the water level is to come down well below the surface? Take saturated unit weight of soil is 20 kN/m³.
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Explain types of slope failure and method of improving stability of slopes.
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Explain the relation for the factor of safety of an infinite slope made of cohesionless soil subjected to seepage parallel to the slope.
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Describe Bishop’s simplified method.
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Calculate the safe height for an embankment rising 70° to the horizontal and to be made with a clayey soil having unit weight of 20 kN/m³, φ = 15° and a cohesion of 20 kN/m². Factor of safety = 2.5. Value of stability number = 0.14.
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Explain, with a sketch, the component parts and their function, of a rockfill dam.
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How can you differentiate the stability analysis in rock fill dam compared to earthen dam?
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Explain the methods of foundation preparations for rock fill dam.
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How you can control the seepage in the body of rock fill dam and also write note on different sealants provided in the body of wall.
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