Research on method for determining diameter of TBM pilot tunnels in ultra-long tunnel combination construction

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0003

Abstract

Abstract:

To study the influencing factors and optimization algorithm of the TBM pilot tunnel diameter, this research was based on the G219 Xitianshan ultra-long tunnel project. The contour boundaries of the muck discharge belt conveyor, concrete and muck transport vehicles, and construction ventilation ducts were discretized into coordinate points on a 2D plane, which were then placed in a circular section of the pilot tunnel. Taking spacing constraints between every two elements as constraint conditions, the simulated annealing particle swarm optimization algorithm was adopted to optimize the corresponding circular diameter of the tunnel section. Two working conditions of the TBM pilot tunnel diameter were analyzed for optimization: a belt conveyor suspended from the tunnel roof and a belt conveyor installed on the tunnel side. The tunnel diameters after primary support were 8.34 m and 8.55 m, respectively. Since primary support for Class Ⅴ surrounding rock was C25 shotcrete with a thickness of 23 cm, the initial TBM excavation diameter was determined to be 8.8 m. After the construction of the secondary lining and partition wall, the air supply and exhaust areas of the pilot tunnel during the operation period were 18.23 m² and 21.64 m², respectively. After verification, the section meets technical indicators for operational ventilation. By taking into account engineering deviations and a reserved margin of 3 cm, the final TBM excavation diameter of Xitianshan Tunnel was determined to be 8.83 m.

Key words: ultra-long highway tunnel, tunnel boring machine (TBM) pilot tunnel, diameter optimization, graph boundary discretization, simulated annealing particle swarm algorithm, internal layout optimization

CLC Number:

X947

CUI Ming, DI Xuejun, PEI Hongyu, WANG Zhiyuan. Research on method for determining diameter of TBM pilot tunnels in ultra-long tunnel combination construction[J]. China Safety Science Journal, 2025, 35(S2): 7-13.

Figures/Tables 10

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序号	风管1	风管2	风管3	导洞内径
1	1.4	1.4	1.4	7.72
2	1.4	1.4	1.6	7.77
3	1.4	1.6	1.6	7.84
4	1.6	1.6	1.6	8.06
5	1.4	1.6	1.8	8.06
6	1.8	1.8	1.8	8.19
7	1.6	1.8	2	8.29
8	1.8	1.8	2	8.34
9	2	2	2	8.46