JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV STRATA CONTROL TECHNOLOGY Previous Question Paper (January/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 are the physical model concepts of strata mechanics?
Answer
Physical model concepts in strata mechanics involve the use of scaled-down laboratory representations to simulate rock mass behavior. Key concepts include geometric similarity, kinematic similarity, and dynamic similarity, ensuring that the model's stress, strain, and failure characteristics accurately reflect the prototype rock strata.
What are the factors to be considered in the assessment of mining induced stress?
Answer
Factors include the in-situ stress field (vertical and horizontal stresses), the geomechanical properties of the rock mass (strength, modulus), the mining geometry (depth, panel width, pillar size), and the sequence of extraction which influences stress redistribution.
What are the causes roof falls in coal mines?
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Describe about the different modes of side failures in coal mines.
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What are the precautions to be taken while bolting with Resin?
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Describe the modeling techniques available in strata control.
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Describe about strain gauges.
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Describe the monitoring system to know the front and rear abutment pressures in a Longwall panel.
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What are the general duties of a strata control monitoring mazdoor?
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What are the latest strata control instruments available to predict the roof falls?
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Part B
Explain fundamentals of Strata Mechanics.
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Explain different geological factors contributing to strata control problems in mines.
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Discuss the strata control problems vis-à-vis monitoring systems in deep underground coal mines.
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Identify the different sources/causes of side fall hazards in an underground coal mine and suggest the control measures for the side falls on top priority basis using risk assessment.
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Estimate the rock load and design a support system for a continuous Miner development district with the following details: Width = 5.6 m, height = 350m; RMR = 52; Density = 2.05 t/m2; Anchorage strength of the bolt = 20t, assume other parameters.
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Explain the procedure of determining the load on a chock shield in a Long wall face with an example.
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Explain and demonstrate the geotechnical instrumentation for monitoring a Continuous Miner depillaring Panel with a simple sketch.
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List and explain different strata control instruments used for monitoring of load on the pillar in underground coal mines.
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List the different strata control instruments used in a high capacity Longwall panel.
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Explain the principle of operation of the above instruments.
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Write the organization chart for a strata control cell of a BG panel and explain the duties and responsibilities of each person the organization chart.
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