Numerical Simulation of Straight Cutting Blasting of Empty Hole in Railway Tunnel and Its Application

  • Li Shuguang
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  • Post-doctoral Research Workstation, China Railway 20th Bureau Group Co., Ltd., Xi'an 710016, P.R. China

Received date: 2024-07-17

  Online published: 2025-05-06

Abstract

In the straight cut blasting, the empty hole is often used as the auxiliary free surface and the compensation space of the blasting rock, which has an important influence on the blasting effect. Based on the background of a railway tunnel project, this paper studies the empty hole linear cutting blasting through three important means of theoretical analysis and calculation, numerical simulation and field application. With the help of ANSYS / LS-DYNA finite element software, the influence of two key technical parameters of empty holes with different diameters and the spacing between holes on the blasting effect under the action of multi-hole blasting is analyzed. The results show that the final forming effect of the empty hole linear cutting blasting cavity is related to the diameter of the empty hole and the distance between the charging and the empty holes. When the diameter of the empty hole is two times the diameter of the charging hole and the distance between the two is 2.5 times the diameter of the empty hole, the cutting blasting effect is the best. Based on the theoretical analysis and numerical simulation results, the design and application of empty hole linear cutting blasting are carried out on the site. The tunnel face is smooth and smooth, the average linear over-excavation is about 15 cm, and the contour forming quality is high, which verifies the rationality of numerical simulation and blasting scheme. The research results can provide reference for similar tunnel section blasting design.

Cite this article

Li Shuguang . Numerical Simulation of Straight Cutting Blasting of Empty Hole in Railway Tunnel and Its Application[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(2) : 610 -619 . DOI: 10.20174/j.JUSE.2025.02.28

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