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本文采用动态光弹性的模型实验方法,分析爆破产生的簇生裂纹的扩展特性,研究驱动裂纹扩展的动力。结果表明,爆炸将产生向外扩展的簇生裂纹,在其扩展的不同阶段,主要驱动力迥然不同。前期,主要驱动力是爆生的高压气体;后期,反射应力波是主要的驱动力。由于驱动力不同,裂纹扩展的不同阶段的扩展特性也有较大差异,出现连续扩展、间断扩展等不同的扩展型式,最终达到破碎介质的效果。
In this paper, the dynamic photoelastic model experiment method is used to analyze the expanding characteristics of cluster-induced cracks generated by blasting and to study the driving force for driving crack propagation. The results show that the explosion will produce outward expansion of the cluster cracks, in its different stages of expansion, the main driving force is very different. Early, the main driving force is the explosion of high pressure gas; later, the reflected stress wave is the main driving force. Due to different driving forces, the expansion characteristics of the different stages of crack propagation are also greatly different. There are different expansion modes such as continuous expansion and intermittent expansion, finally achieving the effect of crushing medium.