Application of Medium-deep Hole Multi-row Differential Blasting Technology in Cutting and Drawing Groove
Due to the limitation of the back line of blasting,the phenomenon of multi-row of simulta-neous blasting occurs when the end cutting lane is enlarged in the sublevel open-stope method of single vein mining.In order to reduce the event occurrence of blasting overhanging roof and ensure the effect of slot ex-pansion,the parameters of rock drilling and blasting were determined according to the relevant theoretical formulas or empirical formulas of free surface hypothesis and compensation space hypothesis,and the blast-ing tests were carried out.The test results show that the height of the cutting groove formed after blasting is more than 14.5m(designed 15m),and the blasting width is 3.1～3.4m(designed 3.5m),which meets the re-quirements of normal blasting free surface and compensation space,and the blasting block degree is small,which meets the requirements of ore extraction and late medium and deep hole blasting.The problem of blasting with too many holes in one side cut roadway in long span medium and long hole stope has been solved successfully,and the application field of differential blasting technology has been increased.
free surface hypothesiscompensation space hypothesisdifferential timemultiple dif-ferential blasting
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NSTL
万方数据
维普
