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Outline
In order to study the necessity of setting up piston ventilation ducts in metros in China's severe cold regions, this article selects typical station public areas and section tunnels of the operating Shenyang Metro Lines 1 and 9, and tests their temperature, carbon dioxide concentration, and inhalable particulate matter concentration under open ventilation operation in the hottest month and closed ventilation operation in the coldest month; utilizing temperature as an indicator of the thermal environment, carbon dioxide concentration and inhalable particulate matter concentration as a measure of air quality, this research quantitatively analyzes the actual environmental control effect of the open ventilation system of the full-height non-enclosed platform doors in operating Shenyang Metro lines on the typical stations public areas and section tunnels. The findings suggest that the piston ventilation volume formed by the open ventilation system of the full-height non-enclosed platform doors in the Shenyang Metro within the section tunnels has exceeded the amount required for temperature control, indicating that the actual regulating capacity of the piston ventilation ducts on the thermal environment of the section tunnels is relatively weak; after closing the piston ventilation duct, the thermal environment and air quality can still meet the design specifications; for future metro lines in Shenyang, it may be advisable to eliminate the piston ventilation ducts (shafts) as an optimization design scheme of the piston ventilation system; the elimination of piston ventilation ducts (shafts) has no impact on the safety of ventilation mode in station public areas and tunnel sections under both normal and emergency operating conditions. The research results in this paper can serve as a reference for the optimal design of piston ventilation systems in metros in other cities located in severe cold regions in China.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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