摘要
为研究在隧道内爆破时冲击波遇到障碍物时的传播规律,文章依托攀枝花至大理高速公路宝鼎2号隧道工程,通过建立三维数值模型,在LS-DYNA中分析了冲击波的传播形态,以及其沿隧道轴向、径向的超压时程变化曲线。结果表明:冲击波在未接触到隧道壁面时,以“球对称”形式向四周传播,在经过隧道壁面多次反射后,最终以“二维平面波”的形式进行传播;受隧道内壁面多次反射的影响,冲击波在轴向和径向的超压时程曲线传播规律基本相同,伴随着多个波峰震荡,呈明显的锯齿状衰减;在隧道变截面处,不同区域的冲击波表现形式不同;实际施工时,应根据不同的区段,提出不同的冲击波防护对策。
In order to study the propagation law of shock wave when obstacles are encountered during blasting in the tunnel,based on the Baoding No.2 tunnel of Panzhihua-Dali expressway,this paper analyzes the propagation form of shock wave and the time-history curve of axial and radial overpressure along the tunnel by establishing 3D numerical model using the LS-DYNA.The results show that:the shock wave propagates in the form of“spherical symmetry”before it comes into contact with the tunnel wall,and finally propagates in the form of“two-dimensional plane wave”after repeated reflection through the tunnel wall;under the influence of multiple reflections from the inner wall of the tunnel,the time-history curve of the shock wave overpressure in axial and radial are basically the same,accompanied by multiple crest shocks,showing an obvious jagged attenuation;the shock wave shows different forms in different areas at the variable section of the tunnel;different shock wave protection countermeasures should be put forward according to different sections.
作者
王磊
王佳
康海波
邹逸伦
WANG Lei;WANG Jia;KANG Haibo;ZOU Yilun(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031;Sichuan Road and Bridge Group Co.,Ltd.,Highway Tunnel Branch,Chengdu 610200)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第S01期603-611,共9页
Modern Tunnelling Technology
关键词
公路隧道
冲击波
数值计算
传播规律
Highway tunnel
Shock waves
Numerical simulation
Propagation law