集束孔掏槽爆破破岩机理研究  

STUDY ON ROCK BREAKING MECHANISM OF BUNDLE-HOLE CUT BLASTING

作　　者：李赟鹏 冯盼学 冯春[3] 张一鸣 LI Yunpeng;FENG Panxue;FENG Chun;ZHANG Yiming(School of Civil and Transportation,Hebei University of Technology,Tianjin 300401,China;BGRIMM Technology Group,Beijing 102628,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]矿冶科技集团有限公司,北京102628 [3]中国科学院力学研究所,北京100190

出　　处：《力学与实践》2023年第1期90-99,共10页Mechanics in Engineering

基　　金：国家自然科学基金(52178324);科技部国家重点研发计划(2018YFC1505504)资助项目。

摘　　要：掏槽爆破是竖井掘进爆破的常用手段,集束孔爆破用于掏槽爆破可有效提高掏槽效率。集束孔掏槽爆破过程涉及到结构在动力载荷下的从连续介质到非连续介质过程,数值计算过程复杂,如何快速估计某特定集束孔设计的爆破效果一直是科研界与工程界研究重点之一。本文基于应力波叠加方法提出了爆破区半径快速计算公式,同时基于连续-非连续单元法对5孔集束孔爆破设计展开了理论与数值分析。通过与实验结果对比,验证了计算公式的有效性,并讨论了集束孔掏槽爆破的破岩机理与规律。结果表明,当集束孔孔间距为4~5倍炮孔直径时,爆破效果最佳。本文相关成果可为爆破设计人员提供一定指导。Cut blasting is a commonly used method of shaft excavation blasting project. The application of bundle-hole cut blasting can improve the cut efficiency. However, the process of bundle-hole cut blasting involves the continuous and discontinuous process of the structure under dynamic load, the numerical calculation process is complex. How to quickly estimate the blasting effect of a specific cutting design has always been a key point in scientific research and engineering field. In this paper, based on the explosion stress wave superposition method, a fast calculation formula of crater radius is proposed. Meanwhile, based on continuous discontinuous element method(CDEM), the rock breaking mechanism of bundle-hole cut blasting is discussed and verified with experiments. By comparing with the experimental results, the availability of the calculation formula is verified and the rock breaking mechanism of bundle-hole cut blasting is revealed. The obtained results show that when the cut hole spacing is 4~5 times of the diameter of the hole, the blasting effect is the best. The results of this paper can provide some guidance for the design of bundle-hole cut blasting.

关 键 词：集束孔 掏槽技术 爆破漏斗 破岩机理 破裂度 

分 类 号：O382[理学—流体力学] O389[理学—力学]