Research on the Problem of Transient Pressure in Tunnel of China's Double Track Railway with the Trains Being Speed up and its Reduction Measures

Research purposes: According to the calculation,this paper analyzed the transient problem of existing(double-track) tunnel and put forward the reduction measures.Research methods:Take the double-track tunnel in the Lanzhou-Wunan for example,the relation graph of train speed and maximum pressure has been simulated and figured out with the formula.Research results:The result of calculation indicates that transient pressure on the tunnel of Shanggulangxia can not reach the standard of comfort while traveling speed is over 145 km/h.Research conclusions:With the trains being-speed up,the transient pressure of double-track tunnel in the existing railway can not reach the standard of comfort.In the future construstion,we should take active or passive reduction methods according to the specific situation.