Abstract
This is a study on underground tunnel ventilation for piston effects influenced by
draught relief shaft. Field measurements of transient air movement in the draught relief
shaft for a typical Taipei underground subway station were taken under winter and summer
conditions. It has been found that the air in the draught relief shaft has a maximum of 2 m/s
and on average lies between 0.7 and 1.1 m/s. This study defines an index ηPE, for
eva luating the efficiency of tunnel ventilation by piston effects. This index can be used to
analyze the piston effects due to different shaft length and sectional area. The measurement
results show that the train piston effects are effective only for certain shaft length and
operating conditions.

摘要
本文主要研究在釋壓通風(fēng)井影響的活塞效應(yīng)作用下的地下隧道通風(fēng)問題。在夏季
和冬季，分別對臺北一個典型地鐵車站內(nèi)的釋壓通風(fēng)井瞬時空氣流速進行測量，測得
其最大值為 2m/s，平均值為0.7~1.1m/s。研究中，引入?yún)?shù)ηPE 來評價活塞效應(yīng)下的
隧道通風(fēng)效率。該參數(shù)用來分析不同井深和井截面條件下的活塞效應(yīng)。據(jù)測量結(jié)果，
活塞效應(yīng)只在特定的井深和列車運行條件下才發(fā)揮作用。