摘要
文章结合工程实际,以西南地区某高速公路隧道为依托,采用数值模拟的手段,在LS-DYNA中建立三维变截面隧道模型,分析爆破后冲击波在变截面隧道内的传播。研究结果表明,冲击波传播到不同大小的截面交界处时会发生复杂的现象,当冲击波从截面较大段落进入较小段落时,既会出现冲击波经碰撞反射后超压增强,又会出现两段冲击波分离、各自独立背向传播的情况;当冲击波从截面较小段落进入截面较大段落时,其冲击波传播特征又与刚起爆时类似,出现半球体反射、马赫反射、平面波等传播方式。本模拟还比较了不同变截面倍数对冲击波传播的影响,随着变截面倍数的增大,衰减系数逐渐减小。
Combined with the engineering practice,based on a highway tunnel in Southwest China,this paper establishes a three-dimensional variable section tunnel model in LS-DYNA by means of numerical simulation,and analyzes the propagation of shock wave in the variable section tunnel after blasting.The results show that complex phenomena will occur when the shock wave propagates to the junction of different sections.When the shock wave enters a smaller section from a larger section,the overpressure of the shock wave will increase after collision reflection,and the two shock waves will then separate and propagate in the opposite direction independently;When the shock wave enters the larger section from the smaller section,the propagation characteristics of the shock wave are similar to those in the case of just initiation,such as hemispherical reflection,Mach reflection,plane wave and so on.The simulation also compares the effects of different variable section multiples on shock wave propagation.With the increase of variable section multiple,the attenuation coefficient decreases gradually.
作者
邹逸伦
宋洋
廖雄
ZOU Yilun;SONG Yang;LIAO Xiong(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期363-370,共8页
Modern Tunnelling Technology
基金
中铁二院工程集团有限责任公司科技开发课题(KYY2019046(19-21))
关键词
公路隧道
爆破
冲击波
变截面
Highway tunnel
Explosion
Shock wave
Variable section
