| 摘要 |
PURPOSE: A multistep split double bench blasting method is provided to bore and blast large quantities of the base rock all together as controlling blasting pollution generated when boring and blasting a target base rock using explosives, that is, polluting elements such as blasting vibration, noise, flying of stone and damage of the blasting boundary. CONSTITUTION: The multistep split double bench blasting method in two face blasting comprises the steps of determining charge loading amount per slot and charge loading amount per blast suitable for standard of blasting pollution influence regulation; determining minimum burdens(1,2,3), space gaps(4,5,6) and hole lengths(12,13,14) of first step; dividing height(11) of the step to be blasted by the determined height of the first step to split it into various steps(7,8,9) of second and third steps; and drilling the split steps, wherein drilling holes having hole length of the first step are arranged in the distance of the holes of the first step so that the drilling holes are drilled, drilling holes having hole length of the second step are arranged at a 1/2 position of the distance of the holes of the first step in case of second step split bench blasting process so that the drilling holes are drilled, and drilling holes having hole length of the second step are arranged at a 1/3 position of the distance of the holes of the first step while drilling holes having hole length of the third step are arranged at a 2/3 position of the distance of the holes of the first step in case of third step split double bench blasting process so that the drilling holes are drilled.
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