CMRS designed hydraulic Prop. Have
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
practice.
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320
Questions
5/16
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The hydraulic props classified into . . . . . . . . types.
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Pick odd-man out
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Vertical compressive forces are proportional to the . . . . . . . . excavation.
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The pressure rating of triaxial cell is . . . . . . . . maximum confining pressure.
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The point load index strength index (IS) of rock is, 0.5 Mpa, what is the compressive strength of that rock?
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Commercial grades fixed by Government of India based an analysis carried out under
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RMR is predominently used for estimation of rock load and design of the support system for . . . . . . . . in underground mines.
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Calculate the safe cover, if the seam extracted by stowing on surface occupied by Kacha buildings assume thickness of seam is 2 m.
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In cross bar support, the side clamps are put in holes of atleast A cm deep. Made in coal pillar side, A is given by
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The prop is errected in inclined seams
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Square set support made of
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The capsule bolt should not be loaded for the first . . . . . . . . hour.
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Maximum unsupported span is related to excavation support ratio [ESR] and 'Q' of Barton's classification by the formulae.
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Prop tightened by the lid against roof and floor by driving . . . . . . . . with hammer.
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40 × 40 m centre to centre size of coal pillar in bord and pillar working, at a depth of 280 m has 4 m wide gallans. What area of roof does a pillar support according to tributary area.
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The fire proof supports are
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The safe cover for surface required when caving employed, and on surface multistored building
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Slot and wedge type bolt made of
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Q100
Open questionFor a frequency of vibration 3 - 300 cycle/sec the PPV safe for structure is
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