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Volume 31 Issue 6
Dec.  2018
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Journal of Southwest Jiaotong University  > 2018  >  53(6): 1245-1252, 1277.
QIAO Liwei. Optimization of Structural Setting Based on Forced Ventilation Method in Tunnel Under Construction[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1245-1252, 1277. doi: 10.3969/j.issn.0258-2724.2018.06.021
Citation: QIAO Liwei. Optimization of Structural Setting Based on Forced Ventilation Method in Tunnel Under Construction[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1245-1252, 1277. doi: 10.3969/j.issn.0258-2724.2018.06.021
shu

Optimization of Structural Setting Based on Forced Ventilation Method in Tunnel Under Construction

doi: 10.3969/j.issn.0258-2724.2018.06.021
  • Received Date: 10 Sep 2016
  • Publish Date: 01 Dec 2018
    Abstract
  • Considering the disadvantages of poor air quality and prolonged dust removal caused by the forced ventilation mode in tunnel construction using drilling and blasting methods, the extractive and air curtain ventilation mode was developed by structure optimization and improvement over the traditional ventilation mode. Diversion tunnels I and II of Wujialing second stage hydropower station were used as the research site, with wind speed and characteristics of free SiO2 dust diffusion monitored and comparatively analysed on site. Moreover, the evolution characteristics of the free SiO2 dust concentration field were simulated and analysed using Ansys-CFD. The results indicate that the concentration of free SiO2 dust in the working area can reach the standard after ventilating for 35 min under the extractive and air curtain ventilation mode, with little free SiO2 dust and a low concentration of dust in the tunnel body area. In addition, the maximum purification rate of SiO2 dust in the working area is 25.93% higher than that in the forced ventilation mode, and the construction environment in the tunnel is greatly improved.

     

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