JNTU
JNTU B.Tech III EARTH AND ROCKFILL DAMS AND SLOPE STABILITY Previous Question Paper (February - 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 meant by ‘pore water pressure’?
Answer
Pore water pressure is the pressure exerted by the water contained within the voids of a soil mass. It significantly influences the effective stress of the soil, as defined by the principle of effective stress: σ' = σ - u, where σ' is effective stress, σ is total stress, and u is pore water pressure.
What are ‘earthen dams’ and under what circumstances are they preferred?
Answer
Earthen dams are structures constructed primarily of compacted earth, sand, gravel, or rock fragments. They are preferred when the foundation soil is relatively weak or compressible, where the valley is wide, or when local construction materials are readily available and economical compared to concrete.
What is the purpose of Chimney Drain?
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What is the criteria for the design of drainage filters?
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Differentiate finite slope and infinite slope.
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List out the types of slope failures.
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List out any two-slope protection measures.
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What do you mean by tension crack?
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Under what conditions the rockfill dams can prove to be economically favorable?
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What are various types of Rockfill Dams?
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Part B
Explain the empirical rules for selecting a suitable preliminary section for an Earth Dam.
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Enumerate the different types of earthen dams, and draw neat sketches showing each type.
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Explain the design criteria for Earth Dams.
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What are ‘rockfill dams’ and what are their advantages over earthen dams? Draw a neat sketch showing the cross section of a rockfill dam.
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Discuss the precautions and remedial measures would you undertake to control the ‘seepage’ through (i) earthen dam body; (ii) through the dam foundation.
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Determine the phreatic line when the dam section is homogeneous (without Filter).
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Explain the protection treatment of upstream and downstream slopes.
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Enumerate and explain by neat sketches the different ways by which the earthen dams may fail. Also suggest suitable precautions that should be undertaken to avoid each type of failure.
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Stability of slopes can be analyzed using either effective stress or total stress methods. Explain.
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Explain the short-term and long-term stability conditions of slope stability analyses for design purposes.
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Evaluate the short-term stability for the dam shown in Figure below. The embankment consists of a saturated soil for which the angle of shearing resistance, ϕu = 0 and the undrained cohesion Cu = 70kN/m2. The calculation is to be carried out for the reservoir depth of 18m and for the case where the reservoir has been completely emptied.
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Explain about the slope stability charts.
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Explain briefly about the various slope stability analysis methods.
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Explain in detail how the seismic or dynamic forces can be considered in a stability analysis.
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Explain the procedure for ordinary method of slices with illustrations.
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Explain with illustrations externally stabilized and internally stabilized earth retention systems.
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Draw the cross-sections of rockfill dams with inclined impervious zone, with central core and with upstream membrane.
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Explain the foundation design requirements for rockfill dams.
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Explain the embankment design requirements for rockfill dams.
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Explain the analytical criteria for the stability of rockfill dams.
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