The pistoneffect caused by train traveling in tunnel has significant influence on the air flow in the tunnel.
列车运行时的活塞效应对隧道内空气的流动特性有显著的影响。
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It manly analyzes four kinds transmutations of pistoneffect, temperature effect, expansion effect, helical buckling effect in the system of tubing and packer.
This paper analyses the pistoneffect problem in dellling shaft sinking method and its detriments. In the meantime, the approaches of solving the problem are proposed by the author.