地下空腔解耦爆炸的数值模拟

Numerical simulation on underground cavity-decoupling explosion

1.
Department of Modern Mechanics, University of Science and Technology of China, Anhui 230027, Hefei, China;
2.
Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

摘要: 采用一种Euler算法和Lagrange算法相结合的有限差分算法计算地下空腔解耦爆炸。对腔内气体，采用Euler网格，对腔外岩石，采用Lagrange网格，对不同半径的空腔爆炸引起的远场应力波和震源函数开展了数值模拟，重点分析了空腔尺度对震源函数的影响。结果表明，空腔增大会降低远场应力波峰值、地下爆炸的耦合强度和震源函数稳态值，但拐角频率随空腔的增大而增大。
- 爆炸力学 /
- 空腔解耦 /
- 有限差分 /
- 地下爆炸 /
- 震源函数 /
- 数值计算
Abstract: A finite-difference algorithm linking Euler and Lagrange meshes was developed to compute the cavity-decoupling explosion, in which both the explosion products and ideal air in the cavity were subdivided as Euler mesh but the rock around the cavity was subdivided as Lagrange mesh. The stress wave induced by cavity explosion were simulated and the relations of the seismic source function and the cavity size were discussed. The results show that with the increase of the cavity, the peak stress of the stress wave, the stable value of the seismic source function, and the corner frequency decrease, but the decoupling factor increases.
- mechanics of explosion /
- cavity-decoupling /
- finite-difference algorithm /
- underground explosion /
- seismic source function /
- numerical simulation