首页|Comparative analysis between single-train passing and double-train intersection in a tunnel
Comparative analysis between single-train passing and double-train intersection in a tunnel
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Aerodynamic pressure significantly impacts the scientific evaluation of tunnel service performance.The aerodynamic pressure of two trains running in a double-track tunnel is considerably more complicated than that of a single train.We used the numerical method to investigate the difference in aerodynamic pressure between a single train and two trains running in a double-track tunnel.First,the numerical method was verified by comparing the results of numerical simulation and on-site monitoring.Then,the characteristics of aerodynamic pressure were studied.Finally,the influence of various train-tunnel factors on the characteristics of aerodynamic pressure was investigated.The results show that the aerodynamic pressure variation can be divided into stage Ⅰ:irregular pressure fluctuations before the train tail leaves the tunnel exit,and stage Ⅱ:periodic pressure declines after the train tail leaves the tunnel exit.In addition,the aerodynamic pressure simultaneously jumps positively or drops negatively for a single train or two trains running in double-track tunnel scenarios.The pressure amplitude in the two-train case is higher than that for a single train.The maximum positive peak pressure difference(PSTP)and maximum negative peak pressure difference(PSTN)increase as train speed rises to the power from 2.256 to 2.930 in stage Ⅰ.The PSTP and PSTN first increase and then decrease with the increase of tunnel length in stage Ⅰ.The PSTP and PSTN increase as the blockage ratio rises to the power from 2.032 to 2.798 in stages Ⅰ and Ⅱ.
Railway tunnelAerodynamic effectPressure characteristicTrain speedTunnel lengthBlockage ratio
Jianming DU、Qian FANG、Xuan ZHANG、Hualao WANG
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Bridge and Tunnel Research Center,Research Institute of Highway Ministry of Transport,Beijing 100088,China
Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China
Key Project of High-Speed Rail Joint Fund of National Natural Science Foundation of China
NETL
NSTL
万方数据
