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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第3期    总第59期    2014年6月

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文章编号:1672-7029(2014)03-0077-06
地铁入口处缓冲结构对车体压力的影响研究
费瑞振1,彭立敏1,2,杨伟超1,2,施成华1,2,晏伟光1

(1.中南大学 土木工程学院,湖南 长沙 410075;
2.中南大学 高速铁路建造技术国家工程实验室,湖南 长沙 410075
)

摘 要: 为了将地铁瞬变压力的波动控制在人体舒适度范围内,根据三维不可压缩Navier-Stokes方程和标准k-ε紊流模型,以22.73 m2的地铁区间矩形隧道为研究对象,建立隧道-列车-空气数值模型,分析地铁隧道中列车特征部位压力和压力梯度的变化规律和影响因素。研究结果表明:列车运行速度超过100 km/h后,有必要在地铁入口处设置缓冲结构;缓冲结构降低压力最大值的效果并不显著,但降低压力梯度最大值的效果显著;喇叭型缓冲结构是优选的地铁入口降压措施;缓冲结构的最佳长度为2倍隧道水力直径;缓冲结构的横断面积越大,其降压效果越好;缓冲结构的最佳开孔率为30%左右。

 

关键字: 缓冲结构;车体压力;地铁隧道;瞬变压力;数值模拟

Study on buffer structure effect on train body pressure in subway inlet
FEI Ruizhen1, PENG Limin1,2, YANG Weichao1,2, SHI Chenghua1,2, YAN Weiguang1

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory of High Speed Railway Construction Technology, Central South University, Changsha 410075, China

Abstract:In order to control subway transient pressure’s fluctuation within the evaluation standard of human comfort, the 22.73 m2 subway rectangular tunnel was investigated according to the three-dimensional incompressible Navier-Stokes equations and the standard k-ε turbulence model, and a tunnel-train-air simulation model was developed, by which a thorough study was conducted on change laws and influencing factors of pressure and pressure gradient on train body characteristic sections in subway. The results show that when the train’s speed is larger than 100 km/h, it is necessary to build the buffer structure at subway inlet, and the buffer structure can reduce the maximum pressure gradient effectively, while its effect on lowering the maximum pressure is non-significant. The horn buffer structure is the optimization form of antihypertensive measures at the subway entrance, and the best length of buffer structure is 2 times the diameter of tunnel hydraulic diameter. Thereinto, the larger the cross sectional area of buffer structure, the better its antihypertensive effect. It can also be found from the research that the best open porosity of buffer structure is about 30%.

 

Key words: buffer structure; train body pressure; subway tunnel; transient pressure; numerical simulation

ISSN 1672-7029
CN 43-1423/U

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