Study On The Vibration Of Adajacent Surface Building Induced By Tunnel Bench Blasting Excavation

With the development of the city and the population,the surface traffic is increasingly congested and unable to meet people’s daily traffic needs,underground tunnel traffic is becoming an important modern mode of transportation,and bench blasting is an important excavation method of underground tunnel.In this paper,the vibration law of adjacent surface building induced by lower bench blasting in Guangzhou metro is studied.Based on the field monitoring results and geological survey,the vibration response of surface buildings caused by lower bench blasting is numerical simulated using ANSYS / LS-DYNA dynamic finite element analysis software.The simulation results and the field monitoring data are almost equivalent,verifying the accuracy of the material model and parameters.The upper bench blasting model,masonry structure model and basement model are established accordingly to study the different influence of vibration of adjacent surface building induced by upper bench blasting and lower bench blasting,the influence of hollow effect on the vibration of adjacent surface building and the influence of basement on the vibration of adjacent surface building.The research conclusions are as follows:(1)The upper bench blasting induces more vibration of adjacent surface building than lower bench blasting with the same quantity of the maximum charge per delay.The vibration of the adjacent surface building decreases first and then increases as the floor height increases.(2)The hollow effect has the greatest impact on the direction of the tunnel excavation of the ground,the secondary impact on the direction of the height of the building,and the least impact on the direction of the tunnel excavation of the ground.(3)The surface buildings with a basement have less vibration than those without a basement,so it is safer to buildings with a basement...