JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV MINE GROUND CONTROL Previous Question Paper (May - 2019 - R15)
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.
Part A
Define Mine Ground Control.
Answer
Mine Ground Control is the branch of mining engineering concerned with the stability of underground openings and surface excavations, focusing on the management of rock stresses and the design of support systems to ensure safe working conditions.
How can you control the ground in Mines?
Answer
Ground control is achieved through a combination of methods: implementing systematic support systems like rock bolts, cable bolts, or steel arches; utilizing active support such as hydraulic props; employing controlled caving or backfilling techniques; and monitoring ground behavior to adjust mining sequences or support densities.
What is Strata Monitoring?
Answer
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Define the term Convergence.
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What are Hydraulic supports?
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Why supports are needed in underground mines?
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What is a waste dump?
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Define ultimate pit slope.
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Define the Subsidence.
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What is super critical subsidence?
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Part B
What are the ground control methods used in underground mines? Explain one in detail.
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List out the constraints of Mine ground control. Explain each one of them in detail.
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What is strata pressure? How do you measure Strata pressures in an underground mine?
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What are the major causes of Roof fall in underground mines? How to avoid them?
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Explain
Hydraulic Stowing.
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Caving.
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What are the supports used in Long wall mining? Explain with a neat figure.
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Tabulate the pillar design as per CMR 1957.
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How do you make an underground opening?
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What are the causes of Subsidence?
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What are the different theories of subsidence?
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Describe the following:
Rock bumps.
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Rock Bursts.
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