郭侃;雷战;艾欣;李洪伟;吴立辉;王蕾;聂华君;
GUO Kan;LEI Zhan;AI Xin;LI Hong-wei;WU Li-hui;WANG Lei;NIE Hua-jun;Anhui Tongling Conch Cement Co., Ltd.;School of Chemical Engineering, Anhui University of Science and Technology;School of Computing Science and Information Engineering, Qilu Institute of Technology;

• 1:安徽铜陵海螺水泥有限公司
• 2:安徽理工大学化学工程学院
• 3:齐鲁理工学院计算科学与信息工程学院

摘要(Abstract)：

为了研究延时时间对岩石爆破效果的影响,通过制作混凝土砂浆材料延时爆破实验模型,对不同延时时间下岩石爆破裂纹扩展进行了研究,并利用超动态应变仪对不同测点的应变大小进行了分析。结果表明:与同时起爆相比,逐排延时起爆的后排炮孔(炮孔2、4)在垂直自由面方向裂纹扩展的更加充分;炮孔沿着最小抵抗线方向,微秒延时(100、300、500μs)相对于同时起爆抛掷距离较短,爆生气体的推动作用效果较弱;试件各测点峰值应变值在0.064～0.067,且随着距离的增大,应力波衰减速度随距离的增大呈逐渐降低的趋势。
In order to study the effect of delay time on rock blasting effect, by making delay blasting experimental model with the concrete mortar, the crack propagation of rock blasting under different delay time was studied, and the strain at different measuring points was analyzed by using the super dynamic strain gauge. The results show that compared with the simultaneous detonation, the row-by-row delay blasting has more full crack propagation at the rear-row blastholes(hole 2 and hole 4) in the direction of the vertical face. In the direction of the minimum resistance line, the throwing distance of the microsecond delay(100 μs, 300 μs, and 500 μs) is shorter than that of the simultaneous initiation, and the propelling effect of blasting gas is weaker. The peak strain value of each measuring point is between 0.064 and 0.067, and the attenuation velocity of stress wave gradually decreases with the increase of distance.

关键词(KeyWords)： 延时爆破;岩石破碎;裂纹扩展;应变
delay blasting;rock crushing;crack propagation;strain

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51404006);; 安徽高校自然科学研究重点资助项目(KJ2019A0123)

作者(Authors): 郭侃;雷战;艾欣;李洪伟;吴立辉;王蕾;聂华君;
GUO Kan;LEI Zhan;AI Xin;LI Hong-wei;WU Li-hui;WANG Lei;NIE Hua-jun;Anhui Tongling Conch Cement Co., Ltd.;School of Chemical Engineering, Anhui University of Science and Technology;School of Computing Science and Information Engineering, Qilu Institute of Technology;

DOI: 10.19931/j.EB.20200085

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