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.

研究结论：提速后，我国既有线上一些双线隧道的瞬变压力不能满足旅客乘车的“舒适度”标准。

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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.

研究目的：通过计算，分析我国双线隧道中存在的瞬变压力问题，并提出相应的缓解措施。

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Using the continuous elastic double layers beam model of track structure, the forces between the sleepers and the tunnel inlay produced by the running of certain subway train were calculated.

采用施加在轨道上的一系列移动轴荷载模拟列车作用，利用轨道结构连续弹性双层梁模型，计算出某城市地铁列车运行产生的轨枕与隧道之间的作用力。

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