【摘要】 为了弄清坑道截面形状对化爆冲击波传播规律的影响,采用LS-DYNA动力有限元软件对不同形状坑道内化爆冲击波的传播过程进行数值模拟和对比分析.研究表明:采用合理的有限元模型可以有效地模拟坑道中化爆冲击波的传播过程;化爆冲击波在不同截面形状坑道内的衰减规律基本一致,但冲击波超压峰值有显著差异;圆形坑道内化爆冲击波超压峰值最低,是直墙圆拱形坑道内的60%左右,正方形坑道内超压峰值最高,是直墙圆拱形坑道内的300%左右;工程设计时,必须考虑坑道截面形状对冲击波的影响,宜尽量采用圆形坑道.更多还原

【Abstract】 To investigate the influence of cross-section shape of tunnel on air blast overpressure,the air blast wave propagation process in different cross-section shape tunnels was simulated with the dynamic finite element software.Results indicated that cross-section shape of the tunnel played a significant role on the peak overpressure.The peak overpressure in square cross-section tunnel and round cross-section tunnel was about 60% and 300% of that in vertical wall arch cross-section tunnel.Research showed that the peak overpressure was largest in the square cross-section tunnel and smallest in the round cross-section tunnel.For the engineering designing,the influence of cross-section shape of tunnel on air blast wave must be considered and the round cross-section tunnel was adopted.更多还原