What do you understand by engineering rock mechanics & its application in mining?
[3 marks]With the help of neat diagram, explain stress-strain curve.
[4 marks]Describe briefly about the different tests to determine the Permeability of rock sample.
[7 marks]Write the name of different physical properties of rock. Why knowledge of these properties is important for a mining engineer?
[3 marks]Arock sample has bulk density of 2.85 gm/cc. Its moisture content was found to be 1.40 %. Find out its dry density.
[4 marks]Briefly explain “Compressive strength of rock”.
[7 marks]What are the methods of determining of shear strength of rock? Describe about any one method in detail.
[7 marks]What is meant by hardness of rocks? Also write the mohr’s scale of hardness.
[3 marks]Arock specimen had moisture content of 2.25 %.Volume of solids was found to be 85 % find out the degree of saturation of rock sample.
[4 marks]Discuss rock mass rating (RMR) & Qsystem in detail.
[7 marks]Explain the Rock Quality Designation Index (RQD).
[3 marks]Explain Porosity, density and moisture content of rock.
[4 marks]Explain briefly about rheology & rheological models.
[7 marks]Discuss about the effect of joints and fracture on mechanical properties of rocks.
[3 marks]Briefly describe about the creep behaviour of rock.
[4 marks]Discuss the Griffith’s theory of fracture in rock mass.
[7 marks]Define Modulus of elasticity and Poisson’s ratio.
[3 marks]Asample of diameter 50 mm and thickness 25 mm was tested by Brazilian test. If failure occurs at a load of 1964.28 kg, determine the tensile strength in kg/cm2.
[4 marks]What do you understand by pre-mining state of stress? Explain hydraulic fracturing method in detail.
[7 marks]How to do the roof testing?
[3 marks]Define failure in rocks. Explain different types of failure in rock.
[4 marks]Two rock samples of 50 mm diameter were subjected to point load test. The rupture was observed at a load of 500 kg and 600 kg respectively. Find out the point load strength in kg/cm2.of both sample and also calculate the unconfined compressive strength of each sample.
[7 marks]Discuss Ideally Plastic, perfectly Plastic and Elastic Plastic materials.
[3 marks]Discuss Mohr’s and Coulomb theories of failure.
[4 marks]Write in detail the theory of reinforcement of rock mass by rock bolting.
[7 marks]