There has been no contact with the miners since the explosion on Friday afternoon and one of only two men to make it out safely has told of an extremely powerful blast that blew him off his feet.
自周五下午的爆炸发生以来还没能和井下矿工取得任何联系，据两位成功逃离井下的矿工说，威力巨大的爆炸曾将他掀翻。
To investigate the parameters of parallel cut blast without empty holes, an advanced numerical method is used to study the explosion effect of charge in hole perpendicular to a free surface.
为了考查无空孔直眼掏槽爆破参数，采用数值模拟方法研究单自由面垂直炮孔的爆炸作用问题。
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