爆炸荷载作用下覆土库外部冲击波传播规律

为了研究爆炸荷载作用下覆土库外部冲击波的传播规律,采用有限元软件ANSYS/LS-DYNA,结合将覆土库结构破坏与冲击波传播先后模拟的新手段,对覆土库外部距爆心比例距离小于15 m/kg^(1/3)范围内空气冲击波的传播过程进行模拟,并对模拟所得不同测线方向(0°、60°、90°、135°和180°)冲击波峰值超压和冲击波到达时间进行分析。结果表明:测点距爆心比例距离在1～15 m/kg(1/3)范围内空气冲击波的传播过程进行模拟,并对模拟所得不同测线方向(0°、60°、90°、135°和180°)冲击波峰值超压和冲击波到达时间进行分析。结果表明:测点距爆心比例距离在1～15 m/kg^(1/3)范围内,随比例距离的增大,在60°和90°测线方向,冲击波峰值超压衰减率从87.63%降到26.39%;在135°和180°测线方向,冲击波峰值超压衰减率从81.19%降到1.39%。随着测点距爆心比例距离的增大,冲击波峰值超压呈指数型衰减,冲击波到达时间呈线性增加。

The law of shock wave propagation outside Earth Covered Magazine under explosion

In order to study the law of shock wave propagation outside Earth Covered Magazine(ECM) under explosion, combined with the new method of simulating the structure failure of ECM and the propagation of shock wave successively, the finite element software ANSYS/LS-DYNA is used to simulate the propagation process of shock wave when the scaled distance between test point and detonation center is less than 15 m/kg(1/3)范围内,随比例距离的增大,在60°和90°测线方向,冲击波峰值超压衰减率从87.63%降到26.39%;在135°和180°测线方向,冲击波峰值超压衰减率从81.19%降到1.39%。随着测点距爆心比例距离的增大,冲击波峰值超压呈指数型衰减,冲击波到达时间呈线性增加。In order to study the law of shock wave propagation outside Earth Covered Magazine(ECM) under explosion, combined with the new method of simulating the structure failure of ECM and the propagation of shock wave successively, the finite element software ANSYS/LS-DYNA is used to simulate the propagation process of shock wave when the scaled distance between test point and detonation center is less than 15 m/kg^(1/3). The peak overpressure and arrival time of shock wave in different directions(0°, 60°, 90°, 135° and 180°) are analyzed. The results show that when the scaled distance from the test point to the detonation center is within the range of 1-15 m/kg(1/3). The peak overpressure and arrival time of shock wave in different directions(0°, 60°, 90°, 135° and 180°) are analyzed. The results show that when the scaled distance from the test point to the detonation center is within the range of 1-15 m/kg^(1/3), the attenuation rate of the peak overpressure of the shock wave drops from 87.63% to 26.39% in the direction of the test line at 60° and 90°; The attenuation rate of the peak overpressure of the shock wave drops from 81.19% to 1.39% in the direction of the test line at 135° and 180°. With the increase of the scaled distance from the test point to the detonation center, the peak overpressure of the shock wave decreases exponentially and the arrival time of the shock wave increases linearly.