Abstract
With the development of underground transportation, in order to reduce the impact on the surrounding environment and traffic, Hejiaying subway island station adopts the concealed excavation method. During the construction process, considering the construction method, tunnel layout, ventilation requirements, and the construction working face as a multi-conductor cave, more stringent requirements are put forward for the construction ventilation of the tunnel. Through the combination of theoretical calculation and numerical simulation, a ventilation method suitable for the actual construction conditions at the site was developed. After applying the scheme to practice, the feasibility of the scheme was verified through the determination of field data, and the improvement of the construction environment for tunnel personnel was achieved, which has certain reference value for similar projects.
Highlights
INTRODUCTIONSubways are mostly characterized by large cross-sections, proximity to buildings (structures) and concealed excavation construction
As underground structures, subways are mostly characterized by large cross-sections, proximity to buildings and concealed excavation construction
The concealed excavation method has the disadvantages of relatively closed operating environment and the generated particulate matter is not discharged, which will lead to a poor underground construction environment, so it is necessary to study the distribution of pollutants in the concealed excavation subway stations and the influence of the same part on pollutants. [1][2][3][4]
Summary
Subways are mostly characterized by large cross-sections, proximity to buildings (structures) and concealed excavation construction. The concealed excavation method has the disadvantages of relatively closed operating environment and the generated particulate matter is not discharged, which will lead to a poor underground construction environment, so it is necessary to study the distribution of pollutants in the concealed excavation subway stations and the influence of the same part on pollutants. According to the basic principles of tunnel engineering ventilation, the tunnel space layout of Hejiaying station, the size and shape of the tunnel section, the construction method, the configuration and number of construction personnel and equipment, and the construction ventilation requirements, the ventilation equipment to meet the ventilation effect is analyzed, and large diameter air ducts are used as much as possible to reduce energy loss when the headroom allows
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