JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year MINE GROUND CONTROL Previous Question Paper (July - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is importance of ground control in mines?
Answer
Ground control is essential to ensure the safety of personnel and equipment by preventing rockfalls, controlling strata movement, and maintaining the stability of underground excavations, thereby ensuring continuous and efficient mining operations.
What are the constraints in ground control design?
Answer
Design constraints include geological conditions (rock mass strength, discontinuities), in-situ stress fields, the geometry of the excavation, the method of mining, and economic limitations regarding support installation and maintenance costs.
Define the term convergence in underground mines.
Answer
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Explain the load on prop in underground mines.
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What is the principal of action of a roof bolts?
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Write short notes on “Early bearing prop”
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What are the factors affecting in design of slopes in open pit?
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Write short note on embankments used in mines.
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What are the methods used to measure subsidence?
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What are the factors causing coal bumps?
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Part B
With the help of suitable diagram, explain the characteristics of coal measure strata.
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Explain the various factors influence design of ground control in underground coal mines.
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What do you understand by the term in-situ stress measurement? Explain any one such measurement method in detail, with suitable diagram.
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What are the various types of roof falls generally occur in depillaring panel in B & P mining? Explain each in detail, giving its importance in ground control.
Answer
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With the help of a neat diagram, explain Hydraulic prop. What are its advantages and Limitations?
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Distinguish between timber supports and steel supports, with suitable examples.
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Discuss on the factors to be considered for pillar design. Explain them in detail, with suitable examples.
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Describe the mining parameters which affect the “design of structures in rock” in underground mines.
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Describe the various underground methods of subsidence control, with suitable figures.
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Explain in detail, the procedure to predict subsidence in underground coal mines, with suitable diagrams? Assume relevant data, wherever necessary.
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