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为确定如下情况而进行研究一般的砂、碎砖面、粘土和盛满水的各种型状塑料袋等有希望的充填物。a),关于炮孔封闭的持续时间和岩石应力,和放射状的移动速度有关的充填物种类和长度的效果。b),炸药、充填物,被爆破岩石的特性与充填物最适宜种类和充填物长度的相互依赖关系。c),有关劳动卫生,防止爆炸性混合瓦斯引燃的炮孔充填物效果。炮孔内充填物的运动特性和速度,与充填物的长度和种类有关。如果所附加的充填
In order to determine the following circumstances to study the general sand, broken brick, clay and filled with water, all kinds of plastic bags and other promising fillings. a) The effect of the type and length of filling on the duration of borehole confinement and rock stress, and radial movement speed. b) Explosives, fillings, characteristics of rock being blasting, and interdependence of the most appropriate type of fill and the length of the fill. c), on labor hygiene, to prevent the explosive mixed gas ignited blasthole filling effect. The movement characteristics and speed of the filling in the blast hole are related to the length and type of filling. If the additional filling