新建隧道爆破开挖对周围道路及边坡产生动力影响分析  

Analysis on Dynamic Influence of Blasting Excavation of New Tunnel on Surrounding Road and Slope

作　　者：张楚 ZHANG Chu(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2021年第4期182-187,共6页Subgrade Engineering

摘　　要：以柳家村隧道工程为依托,运用FLAC3D分析软件建立三维计算模型,选取距离隧道洞口6,33m两处关键截面,分析新建隧道采用三台阶爆破开挖时对临近边坡、省道及村道的动力影响。结果表明:爆破开挖对村道的影响最小;开挖隧道洞口时,洞口上部边坡处的断面最危险,最大振动速度十分接近规范允许值;当隧道开挖到33m,且进行上台阶爆破过程中,上方省道会出现较大的振动情况;在对临近构筑物进行监测时,应至少监测垂直和水平方向的振动速度。Taking the Liujiacun tunnel project as an example,a three-dimensional numerical model is established using the FLAC3D finite element analysis software.Two key sections(6 m and 33 m away from the tunnel portal)are selected to analyze the dynamic impact of three bench blasting excavation of newly-built tunnels on adjacent slope,provincial road and village road.The results show that the blasting excavation has the least influence on the village road.When the tunnel portal is excavated,the section at the upper slope of the tunnel entrance is the most dangerous,and the maximum vibration velocity is very close to the allowable value of the code.When the tunnel is excavated to 33 m and the upper bench blasting is carried out,the vibration of the upper provincial road will be larger.When monitoring adjacent structures,at least vertical and horizontal vibration velocities should be monitored.

关 键 词：爆破开挖 隧道工程 动力影响 振动速度 数值模拟 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]