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火钻是凿岩工程中的最新技术之一,火钻在穿孔时,孔底岩石在高温高速的火焰喷射之下,一层一层地被剥落下来。剥落层的厚度取决于岩石性质及火钻的喷射参数可从几分之一毫米到几个亳米不等。当用单喷管火钻时,孔底呈半球面状,剥落层就是平行于这个球面发生的。在强力的火焰喷射作用下,孔底表面的岩石温度迅速升高,并膨胀起来。但是岩石的传热很慢,距表面很短距离的岩体内,温度升高很少,几乎没有膨胀。这样,表层的岩石就和深部的岩
Fire drilling is one of the latest technologies in rock drilling. When drilling, the bottom hole of rock is peeled off layer by layer under high-temperature and high-speed flame spraying. The thickness of the peel off layer depends on the nature of the rock and the spray parameters of the auger can range from a fraction of a millimeter to several millimeters. When using a single nozzle fire drill, the hole bottom was hemispherical, spalling layer is parallel to the spherical surface occurred. Under intense flame spraying, the temperature of the rock at the bottom of the hole rises rapidly and expands. However, the rock’s heat transfer is very slow. Within rock masses that are a short distance from the surface, the temperature rises very little with little expansion. In this way, the surface rock and the deep rock