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。
The piston effect caused by train traveling in tunnel has significant influence on the air flow in the tunnel.
本文分析了钻井法凿井中所出现的钻井活塞效应问题及带来的危害．提出了解决钻井活塞效应的方向和途径。
This paper analyses the piston effect problem in dellling shaft sinking method and its detriments. In the meantime, the approaches of solving the problem are proposed by the author.
计算结果表明：活塞在热冲击期间表现的温度及热应力的动力学效应是必须加以考虑的。
It was shown that the dynamic effect of the temperature and thermal stress of piston must be considered during thermal shock.
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