基于DIC的露天矿山微差爆破模型试验及数值模拟  

Model Test and Numerical Simulation of Open-pit Mine Millisecond Blasting Based on DIC

作　　者：李洪伟[1] 吴延梦 潘乐 朱成 杨赛群 黄昕旭 LI Hongwei;WU Yanmeng;PAN Le;ZHU Cheng;YNAG Saiqun;HUANG Xinxu(School of Chemical and Blasting Engineering,Anhui University of Science and Technology,Huainan 232000 China;Anhui Leiming Blasting Engineering Co.,Ltd.,Huaibei 235000 China;Anhui Jiangnan Chemical Co.,Ltd.,Hefei 230088,China)

机构地区：[1]安徽理工大学化工与爆破学院,安徽淮南232000 [2]安徽雷鸣爆破工程有限责任公司,安徽淮北235000 [3]安徽江南化工股份有限公司,安徽合肥230088

出　　处：《金属矿山》2024年第3期131-139,共9页Metal Mine

基　　金：国家自然科学基金项目(编号:11872002);安徽省教育厅高校科学研究项目(编号:13190248);淮南市“50·科技之星”创新团队项目(编号:淮人才[2014]2号)。

摘　　要：随着电子雷管在露天矿山台阶爆破中的全面使用,微差爆破技术得到进一步发展,如何通过调整孔间延时提高炮孔之间相互作用力,成为矿山爆破技术的研究重点。基于混凝土模型模拟露天矿山微差爆破,建立高速摄影技术与数字图像相关(DIC)试验系统,基于全场微应变、高速摄影技术和数值模拟对不同孔间延时条件下的炮孔间裂纹发展过程进行了研究。结果表明:爆炸载荷下模型表面裂纹附近的应变持续时间约为3 ms,孔间延时为3 ms时下一个炮孔起爆能够提高炮孔之间的相互作用力;通过数值模拟展示了测点的压力分布特征,在孔间延时为3 ms时测点压力最大,验证了模型试验的准确性;利用MATLAB对数值模拟结果分析发现,孔间延时为3 ms时其破碎程度最佳,与模型试验结果具有较好的一致性;使用高速摄影技术结合DIC方法为研究炮孔之间的相互作用力及裂纹扩展提供了新思路。With the full use of electronic detonators in open-pit mine bench blasting,the millisecond blasting technology has been further developed.How to improve the interaction force between blast holes by adjusting the delay between holes has become the focus of mine blasting technology research.Based on the concrete model to simulate the millisecond blasting in open-pit mines,a high-speed photography technology and digital image correlation(DIC)test system were established.Based on the full-field micro-strain,high-speed photography technology and numerical simulation,the development process of cracks between blast holes under different inter-hole delay conditions was studied.The results show that the strain duration near the surface crack of the model under explosion load is about 3 ms.When the delay between holes is 3 ms,the next hole initiation can improve the interaction force between holes.The pressure distribution characteristics of the measuring points are shown by numerical simulation.The pressure of the measuring points is the largest when the inter-hole delay is 3 ms,which verifies the accuracy of the model test.Using MATLAB to analyze the numerical simulation results,it is found that the degree of fragmenta-tion is the best when the delay time between holes is 3 ms,which is in good agreement with the model test results.The use of high-speed photography technology combined with digital DIC method provides a new idea for studying the interaction force and crack propagation between blast holes.

关 键 词：台阶爆破 高速相机 数字图像相关 微差爆破 MATLAB 

分 类 号：TD235[矿业工程—矿井建设]