The hot smoke test on nature smoke exhaust in Chendu Metro's shallow-burying intersectional tunnel

Nature smoke exhaust in metro's shallow-burying intersectional tunnel is the first time in China.In the paper,the author get a smoke test in Chengdu Metro's shallow-burying intersectional tunnel,and validated that the existed ventilation shaft interval and area can be content with the demand of the tunnel smoke exhaust.The smoke layer level is higher than the human body height.The smoke flow exhausts from the nearest ventilation shaft,and the smoke filled zone is controlled between two ventilation shafts.The wind in and out the tunnel has small influence to exhaust effect.