Analysis of Vibration Response of Frame Building under Tunnel Blasting Load

Abstract

In recent years, a large number of transportation facilities have been constructed in my country, and urban subway projects have gradually increased. The rise of urban subways has effectively alleviated ground traffic congestion, but at the same time it is bound to go under ground buildings. In the process of tunnel construction, it is necessary to ensure the safety of the tunnel, but also to consider the safety and use of ground buildings. In order to study the vibration response analysis of the frame structure under tunnel blasting, the Qingdao Metro Line 1 was taken as the research object, combined with the actual working conditions, and the MIDAS GTS NX finite element software was used for numerical simulation analysis, and the following conclusions were drawn: (1) Due to the frame structure The vibration velocity in the vertical direction is greater than that in the horizontal direction, so the vertical direction of the measuring point is taken as the key research object. A high-rise amplification effect has begun to appear on the 7th floor, and the protection of the middle layer and the top layer should be strengthened during blasting construction. (2) The buried depth of the tunnel is an important factor that affects the vibration response of the tunnel blasting to the frame structure building. When the buried depth of the tunnel is 20m, the vibration speed is close to the maximum range required by the “Blasting Safety Regulations”. Some parameters need to be changed appropriately to make the vibration speed suitable. When the buried depth of the tunnel is 25 m and 30 m, the influence of the buried depth of the tunnel on the vibration velocity is already small.