圆柱形装药在土壤-混凝土复合介质靶中的爆炸开坑规律-《爆破器材》

文章信息/Info

Title:: The Law of Explosion Pit Opening of Cylindrical Charge in Soil-Concrete Composite Medium Targets

Author(s):: LI He-nan; ZU Xudong; School of Mechanical Engineering, Nanjing University of Science and Technology (Jiangsu Nanjing, 210094)

摘要:: 为了探究炸药在土壤-混凝土复合防护工事的表层土壤的爆炸开坑情况及最佳爆破深度，在土壤-混凝土复合介质与单土壤介质两种条件下,对JH-2圆柱形装药在不同埋药深度中的爆炸进行了数值模拟。研究了药柱爆炸后爆坑的形成和发展规律。在8种不同埋药深度及有、无混凝土层的情况下，对比分析了爆坑的形状及尺寸。通过理论计算，得到80 g JH-2药柱在土中抛掷爆破时爆坑的最大半径及相应的埋药深度。对比研究了相同药量、不同埋药深度时土壤与土壤-混凝土两种工况下的爆坑形状与尺寸大小。结果表明：混凝土层反射的冲击波可以对土壤层表面进行二次破坏，使得爆坑的崩落区明显变大。通过试验验证发现，在埋药深度为350 mm时，80 g JH-2圆柱形装药可以在土壤-混凝土复合介质靶中形成一个大且稳定的爆坑，爆坑的形状、尺寸与仿真和理论计算结果吻合。

Abstract:: In order to investigate the explosive excavation situation and optimal blasting depth in the surface soil of the soil-concrete composite protective fortifications, numerical simulations were conducted on the explosion of JH-2 cylindrical charges at different burial depths under two conditions: soil-concrete composite medium and soil medium. The formation and development laws of explosive pits after the explosion of explosive column were studied. Shapes and sizes of the explosion pits were compared and analyzed under eight different burial depths and with or without concrete layers. By theoretical calculation, the maximum radius of the explosion pit and corresponding burial depth during cast blasting of 80 g JH-2 charge in soil were obtained. A comparative study was conducted on the shape and size of blast pits in soil and soilconcrete under two working conditions, with the same amount of explosives and different burial depths. The results indicate that the shock waves reflected by the concrete layer can cause secondary damage to the surface of the soil layer, making the collapse area of the blasting pit significantly larger. Through experimental verification, it was found that at a burial depth of 350 mm, the 80 g JH-2 cylindrical charge can form a large and stable explosion pit in the soil-concrete composite medium target. The shape and size of the explosion pit are consistent with simulation and theoretical calculation results.