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To face the challenges of evacuation and rescue of fires in large hydraulic tunnel group and the unclear control mechanism of smoke barrier，numerical simulation was employed to analyze smoke spreading law and fire control mechanism of smoke barrier. The smoke spreading path and the visibility distribution were analyzed. The impact of installing smoke barrier walls on smoke spreading speed，visibility and temperature was studied，and the effectiveness of smoke control measures was evaluated. The results show that the smoke initially spreads along a single two-way direction，and is affected by ventilation airflow when reaching branch tunnel with smoke reversal，retrogression and increased intrusion range. Smoke fills the whole ventilation network within 500 s，the stratification interface between the smoke layer and the lower air layer is unstable，and the height of the smoke layer at the intersection decreases more significantly. The smoke barrier can promote smoke propagation along the diversion tunnel，and the effect decreases with the increase of propagation distance. It has cumulative blocking characteristics along the tunnel direction of the construction branch. The influence of the smoke barrier leads to the temperature decreasing as the diffusion length increases. A smoke storage pool is formed in front of the smoke barrier to enhance the degree of backflow of smoke. Behind it is the smoke deceleration and pressurization area，and the smoke layer rises.
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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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