爆破冲击波在隧道变截面断面的传播特性  

Propagation Characteristics of Blasting Shock Wave in Variable Cross Section of Tunnel

作　　者：冯建平 王耀华 满军 豆留盼 方勇[2] 方晓峰 FENG Jian-ping;WANG Yao-hua;MAN Jun;DOU Liu-pan;FANG Yong;FANG Xiao-feng(China Railway City Development and Investment Group Co.,Ltd.,Chengdu 610218,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Second Bureau Sixth Engineering Co.,Ltd.,Chengdu 610014,China)

机构地区：[1]中铁城市发展投资集团有限公司,成都610218 [2]西南交通大学土木工程学院,成都610031 [3]中铁二局第六工程有限公司,成都610014

出　　处：《科学技术与工程》2024年第21期9167-9173,共7页Science Technology and Engineering

基　　金：国家自然科学基金(52078428)。

摘　　要：为研究爆破冲击波在隧道内复杂环境下的传播规律,以老营盘隧道为依托,通过建立三维数值模型,在LS-DYNA软件中分析了隧道断面变化不同系数下冲击波的传播规律。研究结果表明:冲击波经过变截面后,总体上以平面波的形式向前传播;冲击波传播至隧道断面扩大界面时,冲击波超压衰减速度加快,超压峰值降低;当断面扩大1.5倍时,冲击波冲量衰减系数为1.158,冲击波能量残留比率为74.5%;断面扩大倍数越大,冲击波超压衰减速度越大,能量衰减幅度越大;冲击波传播至隧道断面缩小界面时,冲击波超压增大,其衰减速度减缓,导致冲击波造成的损伤程度增加;当断面缩小系数取0.5时,冲击波冲量增强系数为0.687,冲击波能量放大系数为2.122;断面缩小系数越小,冲击波造成的损伤越大。In order to study the propagation law of blasting shock wave in the complex environment of tunnel,based on Laoyingpan tunnel,the propagation law of shock wave under different coefficients of tunnel section change was analyzed in LS-DYNA software by establishing a three-dimensional numerical model.The results show that after the shock wave passes through the variable cross section,it generally propagates in the form of plane wave.When the shock wave propagates to the enlarged interface of the tunnel section,the attenuation speed of the shock wave overpressure is accelerated and the overpressure peak is reduced.When the section is enlarged by 1.5 times,the attenuation coefficient of shock wave impulse is 1.158,and the residual ratio of shock wave energy is 74.5%.The larger the expansion ratio of the cross section,the greater the attenuation speed of the shock wave overpressure and the greater the energy attenuation amplitude.When the shock wave propagates to the reduced interface of the tunnel section,the overpressure of the shock wave increases,and its attenuation rate slows down,resulting in an increase in the degree of damage caused by the shock wave.When the section reduction coefficient is 0.5,the shock wave impulse enhancement coefficient is 0.687,and the shock wave energy amplification coefficient is 2.122.The smaller the reduction coefficient of the section,the greater the damage caused by the shock wave.

关 键 词：公路隧道 冲击波 变截面 传播规律 

分 类 号：U451[建筑科学—桥梁与隧道工程]