期刊文献+

爆破后冲击波在变截面直隧道内的传播 被引量:4

The Propagation of Shock Wave in the Straight Tunnel with Variable Section after Blasting
下载PDF
导出
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
  • 引文网络
  • 相关文献

参考文献8

二级参考文献48

共引文献91

同被引文献19

引证文献4

二级引证文献8

;
使用帮助 返回顶部