爆破载荷下隧道围岩动力响应与爆破振速测试研究  

Dynamic Response and Blasting Velocity Test of Tunnel Surrounding Rock Under Blasting Load

作　　者：张业权 孙杰 ZHANG Yequan;SUN Jie(China Railway 19th Bureau Group Third Engineering Co.Ltd.,Shenyang Liaoning 110136,China;School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang Liaoning 110000,China)

机构地区：[1]中铁十九局集团第三工程有限公司,辽宁沈阳110136 [2]沈阳工业大学建筑与土木工程学院,辽宁沈阳110000

出　　处：《铁道建筑技术》2023年第8期147-150,共4页Railway Construction Technology

基　　金：中铁十九局集团有限公司科技研究开发项目(22-Z03)。

摘　　要：依托沈白高铁新宾隧道工程,采用有限元数值模拟软件建立施工隧道模型,模拟实际当量炸药爆炸,以围岩动力响应为主要分析依据,分析钻爆法施工围岩在地震波作用下的动力响应特征及振动衰减规律,并对现场同一截面5个监测点进行定点监测以验证模拟可行性。研究表明:在不同爆心距下,质点振动速度随爆心距的增大呈指数型减小趋势;爆破源近端振速衰减速度明显大于远端,与地震波传播规律相符合;Z(迎爆方向)方向峰值振速一般大于其他两个方向。现场监测结果与模拟结果较为吻合,实际工程中应重点对Z方向峰值振速进行监测,以确保施工安全性。Relying on the Xinbin tunnel project of Shenyang-Baizhou High-speed Railway,the finite element numerical simulation software was used to establish a construction tunnel model,simulate the actual equivalent explosive explosion,take the dynamic response of the surrounding rock as the main analysis basis,analyze the dynamic response characteristics and vibration attenuation law of the surrounding rock constructed by the drilling and blasting method under the action of seismic waves,and conduct fixed-point monitoring of five monitoring points of the same section on site to verify the feasibility of the simulation.The research shows that under different burst distances,the particle vibration velocity has an overall tendency to decrease exponentially with the increase of the burst distance.The attenuation rate of vibration velocity at the near end of blasting source is obviously greater than that at the far end,which is consistent with the propagation law of seismic waves.The peak vibration velocity in the Z(explosion direction)direction is generally greater than that in the other two directions,and the on-site monitoring results are more consistent with the simulation results,so the peak vibration velocity in the Z direction should be monitored in the actual project to ensure the safety of construction.

关 键 词：隧道爆破 围岩 动态响应 数值分析 现场监测 

分 类 号：U455.6[建筑科学—桥梁与隧道工程] U451.2[交通运输工程—道路与铁道工程]