Influence of width/height ratio on post-failure behaviour of coal |
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Authors: | M N Das |
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Institution: | (1) Central Mining Research Station, Barwa Road, 826001 Dhanbad, Bihar, India |
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Abstract: | Conclusions The post-failure slope immediately after strength failure decreases on the negative side with the increase inw/h ratio. Atw/h equal to around 10 or 11 this slope becomes almost zero and then again the slope increases but on the positive side with further increase inw/h ratio.At loww/h ratios, the post-failure characteristic touches the abscissa ultimately. Forw/h greater than 4 or 6 after an initial fall, the broken mass starts reconsolidation on further loading due to high lateral constraints provided at the centre and the curve starts rising again. Forw/h ratios greater than 10 or 11, there is no loss in the post-failure strength. |
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Keywords: | Rock testing coal rock mechanics compressive strength |
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