Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (3): 52-60.doi: 10.6040/j.issn.1672-3961.0.2020.468

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Optimization of ventilation system of TBM tunnel construction and evaluation of dust suppression effect

WANG Chunguo   

  1. Tunnel Engineering Co., Ltd., China Railway 14 Bureau Group, Jinan 250003, Shandong, China
  • Online:2021-06-20 Published:2021-06-24

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Abstract: Hard rock tunneling boring machine(TBM)produces a large amount of dust during construction, which is an important factor affecting the operating environment and the health of workers. To further optimize the construction ventilation and dust removal effect, combined with the actual working conditions of Qingdao Metro Line 1 double shield TBM, Ansys-Fluent software was used to carry out numerical analysis of the tunnel excavation process. The wind speed and dust mass concentration at each location of the tunnel were detected and compared with the numerical simulation results to verify the effectiveness of the model. In view of whether it is necessary to open the dust removal system in the process of TBM tunnel construction, as well as the location of dust removal tuyere and the selection of optimal suction flow, numerical simulation was carried out. When the dust removal system was turned off or the dust removal system was turned on but the suction flow was below 4 m3/s, and the dust diffuses to most areas of the TBM tunneling area. When the dust duct was 15 m away from the hand surface and the suction airflow was 12 m3/s, the dust removal effect reached the best, and the dust diffusion distance was reduced to 45 m, which could effectively remove dust. The research results could provide a scientific basis for the design and construction of tunnel ventilation and dust removal.

Key words: tunnel boring machine, ventilation system, dust suppression effect, numerical simulation, dust diffusion

CLC Number: 

  • U455
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