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Keywords: hole 4
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Proceedings Papers

Paper presented at the ISRM SINOROCK 2013, June 18–20, 2013
Paper Number: ISRM-SINOROCK-2013-130
... holes in the first three holes (starting from left in the broken area) is 10 ms; the delay time between hole 3 and hole 4 is 30 ms; the delay time between hole 4 and hole 5 is 10 ms. We can find that there is no rock break or spalling surrounding hole 5, although the delay time between hole 4 and 5...

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