缓冲结构对隧道口微气压波的影响.PDF

40 5 () Vol.40 No.5 2009 10 Journal of Central South University (Science and Technology) Oct. 2009 ( 410075) 1.0D 2.0D 3.0D(D )1.8S1.9S 1.8S(S )46.7%55.3%52.8% 1.5D 2.0D 3.0D 2.5S2.4S 2.7S 59.4%64.2%71.6% U451.3 U292.91 A 1672−7207(2009)05−1306−06 Influence of hood on micro-pressure wave LIU Tang-hong, TIAN Hong-qi, LIANG Xi-feng (Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic Transportation Engineering, Central South University, Changsha 410075, China) Abstract: In order to alleviate the influence of micro-pressure wave on environment nearby tunnel and design the reasonable hoods, pressure change, micro-pressure wave and a series of hoods were studied using numerical simulation and moving model experiment. The results show that there is an optimal matching relationship between the length and the area for each kind of hood. For the enlarged transect windowless hood, when the length is 1.0D, 2.0D and 3.0D (D is tunnel’s diameter), the corresponding most reasonable area is 1.8S, 1.9S and 1.8S (S is tunnel’s transverse area), and the amplitude of the micro-pressure wave decreases by 46.7%, 55.3% and 52.8%, respectively. For the horn hood, when the length is 1.5D, 2.0D and 3.0D, the corresponding most reasonable area is 2.5S, 2.4S and 2.7S, and the amplitude of the micro-pressure wave decreases by 59.4%, 64.2% and 71.6%, respectively. Key words: train; tunnel; micro-pressure wave; hood