切槽炮孔偏心装药爆源近区裂纹动态力学特征实验研究

doi:10.13722/j.cnki.jrme.2016.0575

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摘要

为研究切槽炮孔偏心不耦合装药爆源近区裂纹动态力学特征，采用数字激光动态焦散线实验系统，对比分析3种切槽形状(三角形、圆形和矩形)对爆源近区裂纹扩展速度v和动态应力强度因子和，以及能量释放率G的影响规律。实验结果表明：偏心爆炸荷载下，3种切槽尖端均产生非对称性裂纹，主、次裂纹分别位于装药耦合、不耦合侧；切槽形状对裂纹起裂影响较大，对裂纹扩展影响较小；起裂阶段，各主裂纹相比，三角形尖端主裂纹，v，G最大，最小，有利于张开型裂纹起裂，而矩形尖端主裂纹，v，G最小，最大，有利于压剪型裂纹起裂；扩展阶段，各主裂纹主要为张开型，趋于0，，v，G整体变化一致。各次裂纹相比，矩形尖端次裂纹，，v，G均最大，消耗较多爆炸能量，不利于主裂纹起裂和扩展。实验结果对于工程实践具有理论参考意义。

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关键词 ：爆破工程, 切槽炮孔, 偏心不耦合, 爆源近区, 切槽形状, 动态焦散线

Abstract：

The digital laser dynamic caustics system(DLDC) was used to study crack initiation and propagation mechanisms near blasting source of grooved borehole with eccentric decouple charge. The effects of three grooves，i.e. triangle，circle and rectangle，on crack propagation velocity v，dynamic stress intensity factorand，and energy release rate G were investigated. Experimental results show that asymmetrical cracks were created at three grooves tips under eccentric blast loading and the main crack was located at the charge side but secondary crack at the other side. Groove geometries made more effects on crack initiation than propagation. As for main cracks，triangle groove benefited for opening mode crack initiation with the largest，v，and G but the smallest ，however，rectangle groove benefited for compressive-shear mode crack initiation with the smallest，v，and G but the largest . In crack propagation，main cracks of three grooves were mainly opening mode with similar trend in，v and G，and is near to zero. As for secondary cracks，these from rectangle groove tip with the largest，，v and G consumed much blasting energy，which was not beneficial for main crack initiation and propagation. The results have theoretical reference significance for engineering.

Key words： blasting engineering grooved borehole eccentric decouple charge blasting source groove geometry dynamic caustics

引用本文:

岳中文，邱鹏，杨仁树，胡庆文，别超军，郭超. 切槽炮孔偏心装药爆源近区裂纹动态力学特征实验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3792-3798.
YUE Zhongwen，QIU Peng，YANG Renshu，HU Qingwen，BIE Chaojun，GUO Chao. Experimental study on crack dynamic mechanical characteristic near blasting source of grooved borehole with eccentric decouple charge. , 2017, 36(S2): 3792-3798.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0575 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3792

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