For testing a specimen in laboratory the length and diameter ratio should be
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
practice.
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Depression of Ground surface called
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In resin capsule the mixture hardens within . . . . . . . . seconds and become solid.
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The guide rail of Alimak raise climber is fixed on the wall by
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The roof in coal mines tested by
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As the bit gauge decreases.
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In the tapered prop, length of tapeing at one end is . . . . . . . .
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Fibre glass rock bolts have gained wide popularly in . . . . . . . . mining.
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The roof is easily cavable, if the protodyakov index is . . . . . . . .
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A base lifting device for some of the shield support is required in longwall face; when
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Crack formed under tensile stress and shear stress called
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The maximum stress of metals can withstand without breaking or without failure for specific number of stress reveals.
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The yeilding props which exerts resistance with continuous increase in yeild called
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The minimum length of sleeper used as chock support if the roof height of 3 m to be supported
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The chock is tightend against the roof by hammering . . . . . . . .
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Stress is
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Plate shows a triaxial test cell for specimens upto . . . . . . . . diameter.
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Normal load, in hydraulic prop.
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In pressure arch theory, lateral forces, intensity of which increases with . . . . . . . .
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Rejects are coals whose ash + moisture is in excess of
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