The minimum length of sleeper used as chock support of the roof height to be supported excess of 3m.
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
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The preferred shape of an opening in uniaxial stress field as
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In coal mines roof consists of chiefly
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Most of the Gondwana coals from any field are rich in . . . . . . . .
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Critical area of extraction not depend on the following
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Which prop can serve a long life for sand stowing faces.
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It is that load, which is set by a setting device, imparted by an yeilding prop.
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Timber bar errected on to the coal pillar . . . . . . . .
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The prop is erreeted in flat seams
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Freshly exposed roof after blasting is effectively and quickly supported by
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The support not gives warning of impending roof failure.
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The self advancing supports are used in coal mines on prop free front long wall faces and are introduced in India in . . . . . . . . colliery.
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Supporting system used in coal mine gate roads in general is
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Compressive strength increases with
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Catalyst tube used in capsule bolting made of
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The shale roof some times gives a ringing sound, if thick ness of shale greater than . . . . . . . .
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Weight of hydraulic prop.
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Rock burst occur in
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It is the load at which an axially loaded prop reaches its elastic limit or at which it begins to buckle.
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The bearing plate is made of
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