Dynamic caustics experimental technique is used to study dynamic characteristics of the propagation of explosion main cracks and branched cracks under blasting stress wave.The prefabricated cracks were opening or closing as a result of the explosion stress wave reflection from these cracks,and reduced the dynamic behaviors of explosion main cracks.These main cracks can't generally pass through the prefabricated cracks and continue to extend.The branched cracks are derived from the ends of the prefabricated ...