Use of rock classification to estimate roof caving span in oblong workings |
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| Authors: | P R Sheorey |
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| Institution: | (1) Central Mining Research Station, 826001 Dhanbad, India |
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| Abstract: | Summary Indian coal measures have widely varying caving characteristics. The maximum roof span of a longwall or depillaring panel at the time of nether roof collapse is shown to have a direct relation withRQD from a study of 12 case histories. A similar relation between maximum unsupported span of openings and rock mass quality as defined by theQ-system was also demonstrated. A simple nomogram is presented to predict the face advance required to cause roof collapse when theRQD or rock mass quality is known. |
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| Keywords: | Rock classification longwall mining strata control mine openings |
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