摘要
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。
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 K0 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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第12期1926-1930,共5页
Rock and Soil Mechanics
关键词
混凝土介质
工程爆破
不耦合系数
数值分析
concrete medium
engineering blast
decoupling coefficient
numerical simulation
