高地应力对掏槽爆破及爆破应力波影响规律的研究

Study on Influence of High In-situ Stress on Cut Blasting and Blast Waves

为了研究爆破开挖中高地应力对加卸载波的影响规律,在理论分析一维地应力下的应力波传播模型之后,借助有限元软件LS-DYNA利用隐-显式连续算法和流固耦合算法,对不同地应力水平下的掏槽爆破开挖进行了数值模拟计算。研究表明:初始地应力的加制作用对掏槽爆破有明显的抑制作用,在爆破设计时需充分考虑地应力的影响;初始地应力的大小,尤其是垂直于应力波传播方向的地应力大小对爆破应力波的产生和传播均有一定的影响。

In order to study the loading and unloading waves behavior influenced by medium and high ground stress during blasting excavation, the finite-element software LS-DYNA was used to analyze the stress wave propagation under one-dimensional in-situ stress using implicit-explicit continuous algorithm and fluid-solid coupling algorithm. Numerical simulation calculations were carried out on excavation of cut blasting under different ground stress levels. The study show that the addition of the initial ground stress significantly suppresses the cut blasting. In the blasting design, the influence of the ground stress should be fully considered. The magnitude of the initial ground stress has a certain influence on the generation and propagation of blasting stress waves, especially the stress in the direction perpendicular to the propagation direction of the stress wave.