起爆方式对应力波传播规律影响的数值模拟

Numerical simulation of initiation methods impact on stress wave propagation

根据起爆方式对应力波传播的影响,运用适于求解高速碰撞、爆炸等问题的有限元程序LS-DYNA,对不同起爆方式下的应力波传播进行模拟研究。以岩石中的应力为研究对象,结合经验公式,对柱状装药形式下岩石中的应力波叠加过程进行分析。结果表明:反向起爆时,岩石中的有效应力最大,中间起爆时次之,正向起爆时最小。该结论为不同的工程实际需要选择不同的起爆方式提供了可靠依据。

This paper, coming as a response to the influence of initiation methods on stress wave propagation, is devoted to using FEM software LS -DYNA adequate for solution to high-speed collision and explosion to simulate the stress wave propagation exposed to different initiation modes. The paper de- scribes an analysis of the stress wave superposition process in column charge mode, depending on the em- pirical formulas. The results show that direct initiation mode results in the maximum effective stress in rock mass, central initiation mode in the medium stress, and indirect initiation mode in the minimum stress. The research provides a more reliable base for properly selecting initiation modes as determined by varying cases.