摘要
地下矿山爆破掘进施工后,超挖现象严重,周边成型质量差,为提高周边成型质量,根据现场工况设计了实验室模型,采用数字激光动态焦散线实验系统,研究辅助孔爆破后产生的爆炸应力波对相邻周边孔聚能药包爆破产生的定向裂纹的影响机理。实验结果表明:聚能药包爆生裂纹在相邻炮孔爆炸应力波作用下,爆生裂纹受相邻炮孔爆炸应力波作用,沿相邻炮孔爆炸应力波传播方向发生偏转,且间距越小,相邻炮孔爆炸应力波作用越显著。爆生裂纹与相邻炮孔爆炸应力波相遇后,裂纹尖端峰值应力强度因子急剧下降,且炮孔间距越小,峰值应力强度因子越小。因此,针对现场超挖问题,可适当增大辅助孔与周边孔孔距,或提高延时时间,避免相邻炮孔爆炸应力波作用下定向裂纹发生较大的偏转,影响周边成型效果。
In response to the severe over-excavation and poor surrounding formation quality after the blasting excavation construction,in order to improve the surrounding formation quality,a laboratory model was designed based on the on-site working conditions.A digital laser dynamic caustic line experimental system was used to study the influence mechanism of the explosion stress wave generated by the auxiliary hole blasting on the directional crack produced by the shaped charge package blasting of the adjacent surrounding hole.The experimental results show that the shaped charge package blasting crack is deflected along the direction of the explosion stress wave propagation of the adjacent hole under the action of the explosion stress wave of the adjacent hole,and the smaller the hole spacing,the more significant the effect of the explosion stress wave of the adjacent hole.After the blasting crack meets the explosion stress wave of the adjacent hole,the peak value of the stress intensity factor at the crack tip drops sharply,and the smaller the hole spacing,the smaller the peak value of the stress intensity factor.Therefore,in view of the over-excavation problem on site,the distance between the auxiliary hole and the surrounding hole can be appropriately increased or the delay time can be increased to avoid the large deflection of the directional crack under the action of the explosion stress wave of the adjacent hole and affect the surrounding formation effect.
作者
马东
刘朕
高常胜
胡世超
李宗武
傅利民
李冬
吴东海
张鹏
宫国慧
韩雪娇
MA Dong;LIU Zhen;GAO Chang-sheng;HU Shi-chao;LI Zong-wu;FU Li-min;LI Dong;WU Dong-hai;ZHANG Peng;GONG Guo-hui;HAN Xue-jiao(Angang Group Mining Gong Changling Co.,Ltd.,Liaoyang 111007,Liaoning,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《工程爆破》
北大核心
2025年第2期39-46,共8页
Engineering Blasting
关键词
动态焦散线
爆破载荷
爆生裂纹
爆炸应力波
动态应力强度因子
dynamic caustics
blast load
explosion crack
explosion stress wave
dynamic stress intensity factor
