既有铁路在隧洞掘进爆破下的振速响应研究  

Research on Vibration Velocity Control of Existing Railway under Tunnel Blasting

作　　者：吴家鹏 WU Jia-peng(China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁四院集团工程建设有限责任公司,武汉430063

出　　处：《价值工程》2024年第9期160-164,共5页Value Engineering

摘　　要：依托某新建工程铁路专用线隧洞工程,采用动力有限元软件建立三维数值模型,研究了既有铁路在新建铁路隧洞爆破开挖下的振速响应特性。结果表明:随着测点与起爆位置距离的增加,同水平面的既有铁路结构振速峰值呈减小趋势;在此基础上,基于现场实测振速与数值模拟仿真计算数值进行对比验证,结果为:既有铁路结构与爆破工点距163m时,既有铁路产生最大振速为0.285cm/s,满足振速控制标准,且数值模拟结果与实际爆破振速大小高度吻合。Relying on the tunnel project of a new railway special line,a three-dimensional numerical model was established by using dynamic finite element software,and the vibration velocity response characteristics of the existing railway under blasting and excavation of the new railway tunnel were studied.The results show that with the increase of the distance between the measuring point and the detonation position,the peak vibration velocity of the existing railway structure in the same horizontal plane decreases.On this basis,based on the field measured vibration velocity and the numerical simulation calculation value,the results show that when the distance between the existing railway structure and the blasting site is 163m,the maximum vibration velocity of the existing railway is 0.285cm/s,which meets the vibration velocity control standard,and the numerical simulation results are highly consistent with the actual blasting vibration velocity.

关 键 词：隧洞爆破 既有铁路 振速响应 数值模拟 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]