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为了研究岩石动态破裂机理,采用高速摄像技术,对切缝药包间隔装药爆炸作用下混凝土试件的破坏过程进行了物理模拟试验。试验研究表明,切缝药包爆炸作用下,混凝土试件在切缝方向上产生两条基本对称的裂纹A和裂纹B。裂纹的萌生、快速扩展以及最后的失稳过程非常明显。裂纹萌生后,其扩展速度急剧达到峰值698m/s,接着快速下降,最后阶段裂纹扩展速度变化平稳。研究结果为切缝药包在实际爆破工程中的应用提供了试验依据。
In order to study the dynamic fracture mechanism of rock, a physical simulation test was carried out on the failure process of concrete specimens under the action of intermittent charges and explosions. Experimental studies have shown that under the explosive effect of kerf kits, concrete specimens produce two substantially symmetrical cracks A and B in the kerf direction. Crack initiation, rapid expansion and the final destabilization process is very obvious. After the initiation of the crack, its propagation speed reached 698m / s peak rapidly, then decreased rapidly, and the crack propagation velocity changed smoothly in the final stage. The results provide the experimental basis for the application of kerf kits in the actual blasting engineering.