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ArticleName Evaluation of cracking zone radius under shooting for prevention of gas-dynamic events
DOI 10.17580/gzh.2017.01.04
ArticleAuthor Dolgov P. V., Shevtsova V. S.

Satpaev Kazakh National Technical University, Almaty, Kazakhstan:

P. V. Dolgov, Professor, Doctor of Engineering Sciences,
V. S. Shevtsova, Associate Professor, Candidate of Engineering Sciences


The article reports the results of the theoretical and experimental investigations aimed to evaluate a cracking zone radius as the key parameter of shooting aimed to prevent gas-dynamic events in potash mines. The formula to calculate the cracking zone radius after shooting in salt rocks is suggested. The authors give the calculated radii of cracking zones in salt rock, sylvinite and carnallite after shooting in holes of different diameter and length and with different amount of explosive. It is found that under shooting in outbursthazardous salt rocks with a single hole with a diameter of 70–80 mm charged with a granulated explosive, the mine personnel safety is ensured by a drivage with a cross section up to 12 m2; on the other hand, efficiency of shooting with the holes 42 mm in diameter is lower than with the holes 70–80 m in diameter by 2–3 times.

keywords Salt deposits, gas-dynamic events, hole, shooting, cracking, explosives, zone radius

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