复杂隧道中爆炸冲击波传播特性的数值模拟

炸药在隧道中爆炸时,由于受到隧道壁的限制,产生的空气冲击波的强度更大,危害更严重;同时隧道中的弯道、岔口影响着冲击波的传播。利用ANSYS/LS-DYNA对隧道中空气冲击波的传播进行了数值模拟,模拟结果与公式计算值基本吻合,验证了数值模型和参数选取的合理性。在此基础上,对冲击波在遇到转弯、岔口的情况进行了数值模拟,模拟结果表明,弯道可以削减10%～15%的超压峰值;岔口中主通道冲击波峰值为直通道的70%～80%,支通道为15%～25%。

NUMERICAL SIMULATION OF SHOCK WAVE PROPAGATION IN COMPLICATED TUNNELS

When explosives explode in the tunnel,the shock wave caused by it is strong and destruction brought by it is more serious due to limit of tunnel wall.Meanwhile,the turn and the crossing in the tunnel affect the shock wave propagation.The propagation of the shock wave in straight tunnel was simulated by ANSYS/LS-DYNA and the numerical simulation results were consistent with the empirical formula calculation results basically,which showed that the numerical model and blasting parameters selection were reasonable.On this basis,propagation of the shock wave in the tunnel with a turn and in the tunnel with a crossing was simulated respectively.Simulation results showed that the overpressure peak value of the shock wave in the tunnel with a turn was reduced 10% ~15%,the overpressure peak value in main channel of the tunnel with a crossing was 70% ~ 80% in straight tunnel,and the overpressure peak value in branch channel was 15% ~25% in straight tunnel.