Engineering Technology Research Center in Intelligent Blasting of Hubei Province, College of Science, Wuhan University of Science and Technology, Wuhan, 430065, China.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China.
Sci Rep. 2023 Mar 22;13(1):4703. doi: 10.1038/s41598-023-31656-y.
The blasting mechanism underlying drilling and blasting of underwater rocks, as an important component of the engineering blasting technology, has not been systematically studied. Laboratory model experiments are expensive and take a long time, while field tests fail to obtain timeous breakage and accumulation effects of underwater blasting, and may even be impossible. Considering this, a model experiment of underwater concrete bench blasting was designed, and the motion of blasted blocks was observed and evaluated with a high-speed camera. Then, numerical simulation was conducted based on Fluent and an engineering discrete element method coupling program complied using the application programming interface. Results show that the blocks form a bulge in the underwater blasting experiment under action of blast waves and expansion in the first period of bubble pulsation. Then, some blocks shrink in the first period of bubble pulsation. As the charge increases, the blast load exerts larger disturbance on the block group, resulting in significant motion of blasted blocks along the vertical direction. At the same time, the horizontal displacement of blasted blocks in the throwing direction increases.
水下岩石钻爆的爆破机理作为工程爆破技术的重要组成部分，尚未得到系统研究。实验室模型试验昂贵且耗时，而现场试验无法及时获得水下爆破的破碎和堆积效果，甚至可能无法进行。考虑到这一点，设计了水下混凝土台阶爆破模型试验，使用高速摄像机观察和评估爆破块的运动。然后，基于 Fluent 和一个使用应用程序编程接口编译的工程离散元法耦合程序进行数值模拟。结果表明，在爆炸波的作用下和气泡脉动的第一周期中，水下爆破试验中的块体会形成凸起。然后，一些块体在气泡脉动的第一周期中收缩。随着装药量的增加，爆炸荷载对块体群产生更大的干扰，导致爆破块沿垂直方向发生显著运动。同时，抛向方向的爆破块的水平位移增加。
