Research on the influence of the number of tunnel blasting free faces on ground vibration based on ANSYS/LSDYNA

Xinyu Ji; Shang Gao; Huapeng Zhao; Guanghui Liu

doi:10.1117/12.2624684

6 February 2022 Research on the influence of the number of tunnel blasting free faces on ground vibration based on ANSYS/LSDYNA

Xinyu Ji, Shang Gao, Huapeng Zhao, Guanghui Liu

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Proceedings Volume 12081, Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021); 120811W (2022) https://doi.org/10.1117/12.2624684
Event: Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021), 2021, Chongqing, China

Abstract

In order to study the influence of tunnel blasting free face number on ground vibration velocity, based on the blasting construction of the Tunnel Boring Mechine (TBM) double-conducting tunnel with a large cross section in the section between Guizhou Road Station and Xizhen Station of Qingdao Metro Line 1. The ANSYS/LS-DYNA finite element program was used to carry out numerical simulation research on tunnel blasting under single, two and three free face conditions. By extracting the ground nodes vibration velocity and the blasting center distance, the calculation formula of blasting vibration velocity under the condition of different number of free faces is obtained by fitting regression. Studies have shown that (1) the values of K and  gradually decrease with the increase of the free face, and the decay rate of the K is more significant. In the process of increasing the number of free faces from 1 to 3, the decreasing rate of K was 61.56% and 80.4%, and the decreasing rate of  was 8.49% and 30.16%, respectively. (2) Tunnel blasting vibration is affected by the number of free faces. Under the condition of equal charge of 1.2kg, the decay rate of the overall vibration velocity of blasting under the condition of a single free face to the vibration velocity of two or three free faces is 26.12% , 34.85%, the vibration velocity shows a non-linear decreasing trend with the increase of the number of free faces.

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Xinyu Ji, Shang Gao, Huapeng Zhao, and Guanghui Liu "Research on the influence of the number of tunnel blasting free faces on ground vibration based on ANSYS/LSDYNA", Proc. SPIE 12081, Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021), 120811W (6 February 2022); https://doi.org/10.1117/12.2624684

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KEYWORDS

Explosives

Signal attenuation

Process modeling

Roads

Computer simulations

Numerical simulations

Data modeling

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