含不同充填物预制裂隙对爆炸裂纹扩展的影响

Effect of prefabricated crack with different fillings on blasting cracks propagation

为了研究充填裂隙岩石动态断裂时裂纹扩展规律,以空气、黏土和水作为有机玻璃的预制裂隙充填材料,在炮孔与预制裂隙的不同夹角、不同距离条件下,通过单发雷管加载,对3种不同裂隙充填物的有机玻璃模型进行了起爆实验。结果表明:爆炸裂纹几乎都不会越过预制裂隙;空气充填模型裂纹总数、左端翼裂纹几乎全部大于黏土和水充填模型;最长裂纹分布位置和长度与反射应力波传播方向和能量有关;空气充填模型右端翼裂纹多随角度增大而增长,黏土充填模型右端翼裂纹则表现为先增后减;爆炸裂纹扩展对充填物种类具有敏感性。

To study cracks propagation rules on filled fissured rock about dynamic fracture, air, clay and water were used as fillings of organic glass prefabricated fissures, under the condition of different angles and distances from blasthole to prefabricated fissures, the explosion experiments on three kinds of different fillings models were carried out through single detonator loading. The results show that blasting cracks almost cannot surmount prefabricated fissures; total cracks and left end wing cracks of models with filling air all most are larger than models with filling clay and water; location and length of the longest cracks are related to propagation direction and energy of reflected stress wave; right end wing cracks of most models with filling air increase with the increase of angles, but right end wing cracks of models with filling clay are first increased and then decreased; blasting cracks propagation are sensitive to filling medium type.