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本文叙述了一种用以确定岩石最小破坏范围时所需的每米炮孔装药量的方法。爆破引起的地面质点的震速,是附近建筑物破坏程度的一种尺度。已经建立了一个表明质点震速是质点至药包的距离和线装药密度的函数的数学模型。该模型与正好在出现岩石损坏或破碎的细长药包附近的致密岩石中的实验质点震速完全吻合。如果已知炸药的重量威力,则利用这个模型就能估算岩石中由爆破引起的永久变形带或破坏带.这个模型还可用来精确地确定靠近隧道周边的每排孔的最大装药量,可避免在与光面爆破孔相邻的那排孔中使用过多的炸药,因而使最终的隧道顶板更安全,并可降低喷浆支护费用。
This article describes a method for determining the charge per meter of shot hole required to determine the minimum rock failure area. Blasting caused by the ground particle velocity, is a measure of the extent of the destruction of nearby buildings. A mathematical model has been established to show that the particle velocity is a function of the distance of the particle from the pack and the charge density of the line. The model fits well with the experimental particle velocity in dense rock just near the slender kits where rock failure or crushing occurs. If the weight power of the explosive is known, the model can be used to estimate the zone of permanent deformation or failure in the rock caused by the blasting.This model can also be used to accurately determine the maximum charge per row of holes near the perimeter of the tunnel, Avoiding excessive use of explosives in that row of holes adjacent to the smooth blast hole thus making the final tunnel roof safer and reducing shotcrete support costs.