English：

A three⁃dimensional finite element dynamic analysis is carried out to study the variation law ofthe maximum amplitude of the tunnel at different positions of the tunnel face with different single chargeblasting distances based on the Julong Avenue Station Project, the ninth station of the North ExtensionLine (Qianchuan Line) Project of Wuhan Rail Transit Line 7. The results indicate that the elevationvibration amplification effect and side wall amplification effect of blasting vibration velocity should beconsidered when the center diaphragm ( CD method) is used for construction blasting. The controlindices of single charge of safety blasting are proposed based on the results of numerical analysis. Theresults of both numerical analysis and field monitoring indicate that the control indices can effectively andsafely control the tunnel blasting operation.