高速列车经过双线隧道瞬变压力及压力梯度特征  

Characteristics of Transient Pressure and Pressure Gradient of a High-Speed Train Travelling Through a Double-Track Tunnel

作　　者：杜建明 房倩[1] 王赶 张顺金 DU Jianming;FANG Qian;WANG Gan;ZHANG Shunjin(Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;China Urban Construction Design&Research Institute Co.Ltd.,Beijing 100120,China)

机构地区：[1]北京交通大学隧道及地下工程教育部工程研究中心,北京100044 [2]中国城市建设研究院有限公司,北京100120

出　　处：《华南理工大学学报（自然科学版）》2022年第9期58-68,共11页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金高铁联合基金重点支持项目(U1934210)。

摘　　要：隧道壁面瞬变压力是影响高铁隧道衬砌结构安全性的重要因素之一。为加深对高速铁路隧道壁面瞬变压力与压力梯度特征的理解,基于RNG k-ε两方程湍流模型与滑移网格技术,数值模拟了缩尺1:1的8节编组高速列车经过双线隧道诱发的气动特性。通过现场实测结果对数值方法准确性进行验证,在隧道壁面瞬变压力时空特征分析的基础上,进一步研究了列车速度、车隧阻塞比、列车数量以及双车等速交会对隧道纵轴中断面瞬变压力及压力梯度的影响。结果表明,隧道横断面内瞬变压力时程曲线基本重叠,断面内压力分布均匀、差异性低;3个典型压力峰值(最大正峰值、负峰值与峰峰值)与列车速度平方或车隧阻塞比平方分别成线性关系,初始压力梯度正峰值与列车速度3次方成线性关系,压力梯度正负峰值与车隧阻塞比的幂次方(2.51~3.14)成线性关系;3个典型压力峰值与列车数量之间满足指数函数关系,8车对应的压力梯度最大正峰值是其它列车数量(4车~7车)的1.25倍;双车等速交会的最大正负压力峰值分别是单车经过的2.22倍与1.15倍,最大压力梯度正负峰值分别是单车经过的1.87倍与2.03倍。相关研究成果对我国高速列车在隧道内的安全营运具有重要的参考价值。Transient pressure is one of the important factors affecting the structural safety of the lining of a high-speed railway tunnel.To further understand the characteristics of transient pressure and pressure gradient of a high-speed railway tunnel wall,a numerical simulation model for a high-speed train composed of eight cars with a scale of 1∶1 was established to investigate the aerodynamic characteristics induced by a high-speed train travelling through a double-track tunnel,based on the RNG k-εtwo-equation turbulence model and the sliding mesh technique.The accuracy of the numerical method was verified by comparing the numerical simulation results with the field measurement.The influences of train speed,blockage ratio of train-tunnel,the number of trains,and two trains intersecting with the same speed on the transient pressure and pressure gradient on tunnel longitudinal middle section were further studied based on the analysis of the temporal-spatial traits of transient pressure on the tunnel wall.The results show that,the time-history curves of transient pressure in the tunnel cross-section are nearly overlapped,the pressure distribution in the cross-section is uniform,and the difference is low.Three typical pressure peak values(maximum positive peak value,negative peak value,and peak-to-peak value)show a linear relationship with the square of train speed or the square of blockage ratio,the positive peak value of the initial pressure gradient has a linear relationship with the third power of the train speed,the positive and negative peak values of pressure gradient have a linear relationship with the power of the blockage ratio(2.51~3.14).The relationship between the three typical pressure peaks and the number of trains satisfied an exponential function,the maximum positive peak value of pressure gradient of 8 trains is 1.25 times that of other cases(4~7 trains).The maximum positive and negative pressure peak values of the two trains intersecting with the same speed are 2.22 times and 1.15 times that of the

关 键 词：双线隧道 高速列车 瞬变压力 压力梯度 数值模拟 

分 类 号：U25[交通运输工程—道路与铁道工程] U266.2[机械工程—车辆工程]