工程爆破中径向水不耦合系数效应数值仿真

在实际工程爆破中，水不耦合炮孔是较常见的，其中水不耦合装药系数是影响爆破效果的关键因素之一。该系数取不同的值，将产生不同的应力波传播机理以及介质的损伤破坏程度。以往的研究主要集中于理论解析法和模型试验法。基于大型非线性动力分析软件LS-DYNA，采用著名的混凝土损伤Johnson-Holmquist-Concrete模型，针对无限混凝土介质水不耦合装药爆破中不同径向耦合系数Kd，展开了对比数值计算，综合分析了损伤破坏区分布和孔壁压力、加速度以及速度等与径向不耦合系数间的关系，得出的结论具有一定的参考价值。

Numerical simulation on effects of radial water-decoupling coefficient in engineering blast

In practical engineering blast,the water decoupling hole is very common.The decoupling coefficient is one of the key factors influencing explosion effects,and its different values will induce different propagation mechanisms of stress-waves and variable destructive ranges in the surrounding mediums.Previous studies mainly focus on analytical solutions and model tests.This paper uses the large-scale nonlinear dynamic analysis software,LS-DYNA,and with famous concrete damage constitutive model Johnson-Holmquist-Concrete to numerically simulate the wave-induced damage properties of concrete by adopting different radial decoupling coefficients Kd for water decoupling blast in infinite concrete medium.The relationships between the damage distribution zones around blasting hole and the pressure,acceleration,velocity of point on hole-wall with the different values of Kd are analyzed.The results obtained in this paper may be useful in engineering blast.