为了获得隧道施工中风管出口到掌子面的距离（以下简称“风管距离”）以及风管出口风量对施工通风时间的影响规律，以郑万线机械配套施工的大断面高速铁路隧道为工程依托，采用CFD数值模拟和多项式拟合数值分析方法对1D、2D、3D、4D（D为断面当量直径）的风管距离搭配2 000、2 500、3 000、3 500 m3/min 4种风管出口风量作用下的最少通风时间进行研究。研究结果表明，施工通风时间受风管距离与风管出口风量2个因素的影响，通风时间t与风管距离x之间关系可以表示为t=ax2+bx+c的形式，且式中各项系数均可以通过多项式拟合表达为风管出口风量Q的函数，故研究可得出通风时间t与风管距离、风管出口风量间的函数关系式为t=f(Q)x2+g(Q)x+h(Q)，同时运用该公式对向家湾隧道工程实例的通风时间进行预测。研究成果为郑万线隧道机械化快速施工通风时间的确定提供了理论指导，研究揭示的规律及所采用方法对类似隧道工程施工通风时间的确定具有一定的参考价值。

It is very important to obtain the distance between ventilation pipe outlet and tunnel face (short for the ventilation pipe distance) and the influencing laws of outlet volume of ventilation pipe on construction ventilation time. Hence, the minimum construction ventilation time of ventilation pipes with ventilation pipe distances of 1D, 2D, 3D and 4D, where D is equivalent diameter of tunnel crosssection, and 4 kinds of outlet volumes of 2 000 m3/min, 2 500 m3/min, 3 000 m3/min and 3 500 m3/min are studied by computational fluid dynamics (CFD) simulation, by taking mechanically constructed large crosssectional ZhenzhouWanzhou highspeed railway tunnel for example. The study results show that the construction ventilation time can be affected by ventilation pipe distance and outlet volume of ventilation pipe; the relationship between the construction ventilation time (t) and ventilation pipe distance (x) can be represented as t=ax2+bx+c, where a, b and c are functionally related to outlet volume of ventilation pipe (Q); the relationship among the construction ventilation time (t), ventilation pipe distance (x) and outlet volume of ventilation pipe (Q) can be represented as t=f(Q)x2+g(Q)x+h(Q), which is apply to the prediction of construction ventilation time of Xiangjiawan Tunnel. The study results are of great significance to theoretical guidance of determination of mechanized construction ventilation time of ZhengzhouWanzhou highspeed railway tunnel.