基于ANSYS/LS-DYNA的防凌减灾微差爆破数值模拟

Numerical simulation of ice prevention and disaster reduction by millisecond blasting based on ANSYS/LS-DYNA

为研究水下爆炸载荷对冰凌的破碎效果及二维双孔微差爆破冰体的损伤裂隙,结合黑龙江呼玛段实际冰水情,运用LS-PREPOST程序系统进行了数据后处理,采用ANSYS/LS-DYNA有限元软件模拟了冰体爆破损伤裂隙发展情况与冰凌破碎过程。结果表明:合理延期时间下,随双孔爆破时间增长冰盖爆破面积逐渐变大,在40~45 ms时,冰层裂隙已基本不再扩展,冰层中爆炸冲击波已退化为弱波;受有效应力影响,冰盖形成明显的粉碎区和裂隙区,冰体产生径向裂纹和环向裂纹;爆破坑半径误差在8.4%以内,精度略有提高,验证了误差公式的准确性。

This paper aims to explore the fracture effect of underwater explosion load on ice and the damage fissure of two-dimensional double-hole micro-differential blasting ice body.The study building on the actual ice water situation of Huma section in Heilongjiang Province involves using LS-PREPOST program system for data post-processing,simulating the process of damage fissure of ice body blasting and the ice crushing process by using finite element software ANSYS/LS-DYNA.The results show that within reasonable delay time,the ice sheet blasting area gradually increases with the increase of double-hole blasting time;the crack in the ice sheet expands no longer at 40-45 ms,and the blast wave in the ice sheet degenerates to weak wave;Influenced by effective stress,the ice sheet forms obvious crushing zone and fissure zone,and the ice body producing radial cracks and circumferential cracks;The radius error of the blasting pit is less than 8.4%,and the accuracy is slightly improved,which verifies the accuracy of the error formula.