In order to explore the influence of blasting construction of new tunnel on the blasting vibration of existing tunnels with different cross-section forms, relying on the blasting construction scheme of the new Damaoshan Tunnel on Fu-Xia Railway, the fluid-solid coupling algorithm is used to establish the refined numerical model of each blast hole, and the blasting load curve is extracted and applied to the simulation study of blasting vibration. The results show that: The blasting vibration of the new tunnel has a great influence on the blasting side of the existing tunnel. The most obvious areas of vibration of tunnels with different cross-sections are concentrated in the arch waist and side wall of the blasting side. The influence of the back explosion side of the double-line tunnel is greater than that of the single-line tunnel and the vibration velocity decays slower. The maximum vibration area of the existing tunnel along the tunnel axis is concentrated within 0-5 meters behind the closest section to the face of the new tunnel. The vibration velocity attenuation rate in the front area of the tunnel face is slower than that in the rear area. The superposition of blasting seismic waves will cause the vibration velocity value to increase at a longer distance. The research content can provide reference value for the fine simulation of blasting and the analysis of blasting vibration under similar working conditions.
Chen Liang
. Numerical Simulation of the Blasting Vibration of New Tunnel near Existing Tunnel[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 857
-864
.
DOI: 10.20174/j.JUSE.2024.S2.40
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