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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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

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

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