Researches on the Influence of Blasting of Newly Built Tunnel on the Existing Tunnel Structure with Small Cross Angle

Du, X.; Xiao, Qingnong; Li, Congming; Xiong, Qihua; Jin, Yu

doi:10.1155/2021/1865694

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…Lei et al 13 used ANSYS/LS-DYNA finite element numerical simulation software to simulate the tunnel blasting contour of weak interbedded layers, as well as put forward an optimized blasting solution for the damaged condition of surrounding rock. Du et al 14 used numerical simulation software to analyze the dynamic response of an existing tunnel structure in comparison with the blasting and excavation of new tunnels. Ling et al 4 used ANSYS/LS-DYNA finite element numerical simulation software to simulate the cumulative process of millisecond-delayed blasting damage to the surrounding rock, and they also analyzed the cumulative damage evolution law of the rock mass.…”

Section: Introductionmentioning

confidence: 99%

Damage and reliability analysis of double-arch tunnel without a middle pilot tunnel under blast load

Jian,

Tao,

Song

et al. 2024

Sci Rep

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In this study, a new type of multi-arch tunnel construction method is proposed. This effort is undertaken due to the many disadvantages of the traditional multi-arch tunnel construction method. Furthermore, this method omits the construction of a middle pilot tunnel, and it has the advantages of safety, high efficiency, and being economical. When using the method of continuous arch tunneling without a middle pilot tunnel, the blasting of the first tunnel and the following tunnel has a greater impact on the surrounding rock damage, as well as on the supporting structure of the same cross-section. Therefore, this study uses LS-DYNA finite element software to construct a three-dimensional numerical model. In addition, the perimeter rock damage law and mechanical response characteristics of the supporting structure in the same cross-section of the first tunnel, as well as the following tunnel after blasting without a middle pilot tunnel, are analyzed. At the same time, the results of the study are based on optimizing the blasting program, and these are then applied to the field. Through the results, it is found that, after blasting a continuous arch tunnel without a medial pilot tunnel, the surrounding rock damage in the arch cross-region of the double-arch tunnel (where the arch top and the arch shoulder are more significant) and the effective stress of the supporting structure exceed the strength design value. In addition, the maximum adequate pressure is distributed in the medial diaphragm wall. With the optimized blasting scheme, the range of the peripheral rock damage is reduced by a maximum of 67%, and the effective stress in the supporting structure is reduced by 25.9–64.8%. The research results are of great significance in terms of improving construction safety, economic efficiency, and project quality, as well as in promoting the research and development of new work methods for double-arch tunnels.

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Section: Introductionmentioning

confidence: 99%