Abstract
In order to study the vibration influence of tunnel drilling and blasting method on the built tunnel with small clear distance, taking the intersection of Zhuhai Dahengqinshan No. 1 tunnel and Zhuji urban rail tunnel as the engineering background, we used ABAQUS finite element software to conduct numerical simulation analysis on the influence of different blasting loads on existing tunnels with small clear distance in Zhuji tunnel construction. The following conclusions were drawn: the blasting construction of the tunnel under construction had the greatest impact on the vault of the existing tunnel; when the peak load was reduced by half, the stress value, vertical displacement, and resultant velocity of Mises were also reduced by half, which indicates that reducing the peak value of blasting load appropriately can ensure the safety of tunnel construction. When the peak load is 2.7 MPa, the measured and simulated values were less than the resultant velocity limit required by the specification. In addition, the relative error between the measured value and the simulated value was less than 5%, indicating the accuracy of the numerical simulation.
Highlights
With the continuous development of urban subway network, the utilization scale of urban underground space is gradually expanding
When the blasting peak load is reduced from 10 MPa to 5 MPa, the Mises stress at the vault is reduced by 51%, the vertical displacement is reduced by 48%, and the maximum resultant velocity is reduced by 50%
It can be seen that the relative error between the field monitoring data and the numerical simulation results at the vault is less than 5%, and the monitoring results of the actual project are less than the vibration velocity limit (15 cm/s) required by the specification, which can be in good agreement
Summary
With the continuous development of urban subway network, the utilization scale of urban underground space is gradually expanding. At present, drilling and blasting method is mostly used in small spacing tunnel construction in China [4, 5]. If the distance between the tunnels is too small, the construction of the tunnel drilling and blasting method will inevitably affect the structural safety of the existing tunnel, disturb the surrounding rock, and cause a series of environmental diseases of the surrounding buildings [6,7,8]. E drilling and blasting construction of the Zhuji tunnel will cause disturbance to Dahengqinshan Tunnel. In this study, taking the intersection of Zhuhai dahengqinshan No 1 tunnel and Zhuji urban rail tunnel as the engineering background, we used the ABAQUS finite element software to compare with the field monitoring data. Is study systematically studied the influence of different blasting loads on the existing tunnel structure with a small clear distance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
