爆破对矿井突出的影响分析

 用煤与瓦斯突出的“球壳失稳”理论对煤层中的爆破作用进行了分析, 证明爆破对煤层的突出危险性影响是比较小的。但在有坚硬岩层伴生的条件下, 爆破产生的振动容易导致破裂带中的煤体冒落, 使得那些有突出危险的软煤突然暴露, 引起突出。由此解释了突出矿井中出现的过煤门突出和爆破“门坎”时的突出现象。

ANALYSIS ABOUT THE EFFECT OF BLASTING ON OUTBURST IN MINE

The functions of blasting in coal seam are analysed according to the principle of the spherical shell destabilization theory. It is approved that the blasting of dynamite does not increase the outburst danger of coal seam; but, when the coal seam is associated by some hard and solid bottom or roof, the roof fall of coal body in crushing zone would be caused by blasting. This could explain the reason of the outburst phenomena, which take place when a tunnel passes one cross gate and a hard rock stratum is blasted.