Open AccessThe effects of Air-vents’ Layouts on Behaviour and Pollution of Dust in Tunnle Construction Environment
Author(s) -
Cunhou Wei,
Wen Nie,
Qiang Liu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/474/7/072024
Subject(s) - wind tunnel , diffusion , airflow , dust control , environmental science , pollution , meteorology , geotechnical engineering , environmental engineering , atmospheric sciences , geology , engineering , waste management , aerospace engineering , physics , mechanical engineering , ecology , biology , thermodynamics
Study on powder behavior is the key to dust pollution prevention and control in tunnel construction environment, using wind energy to control dust diffusion is a common and effective dust control method at present. In this paper, the numerical simulation and field measurement were used to study the powder diffusion in construction of a tunnel boring machine (TBM)-based tunnel, in which the movement and diffusion properties of the powder in the tunnel were achieved and analyzed. By adjusting the height of the exhaust vent and the secondary blowing distance (L P ), the quality of air in the tunnel was optimized. The accuracy of the simulation results was also verified by the field measurements. The results showed that when the height of the dusty return airflow (H W ) is close to that of the exhaust vent (H E ), the rock-dust concentration in the tunnel could be reduced to a certain extent. When L P 50 m, the dust-control air-curtain could be formed within 18.83 m away from the heading. When L P = 60 m, the rock-dust in the tunnel was effectively controlled, and the diffusion distance of the rock-dust was less than 16.4m as well.