According to the equivalent design theory, the length of a tunnel model can be shortened by applying a resistance grid in a tunnel ventilation model experiment. To study the effect of a resistance grid on the ventilation model, this paper analyses the influence of the distance, number, and type of resistance grids in ventilation experiments via a series of model experiments and takes the Dabieshan Tunnel as a case study for verification. The results show that the influence range of the resistance grid decreases with an increasing number of grid holes. When the number of holes per unit area of the grid is greater than 500, the influence length is less than three times the equivalent model diameter. The critical velocity of the model is almost unaffected by the grid spacing, grid number, or grid type. For the same model material, the resistance factor of the model decreases with increasing model size, and the local resistance factor of the grid in the model also proportionally decreases. When the aperture ratio is similar, the local resistance factor of a multiorifice plate grid is greater than that of a wire mesh grid, and the local resistance factor of a square hole grid is greater than that of a circular hole grid. With increasing aperture ratio, the decrease rate of the local resistance factor of a wire mesh grid is less than that of a multiorifice plate grid. The local resistance factor in each grid decreases with an increasing number of grid groups.

根据等效设计理论，通过在隧道通风模型实验中应用电阻网格可以缩短隧道模型的长度。为了研究阻力网格对通风模型的影响，本文通过一系列模型实验分析了阻力网格的距离，数量和类型对通风实验的影响，并以大别山隧道为例进行验证。结果表明，电阻栅的影响范围随着栅孔数量的增加而减小。当网格每单位面积的孔数大于500时，影响长度小于等效模型直径的三倍。模型的临界速度几乎不受网格间距，网格编号或网格类型的影响。对于相同的模型材料，模型的阻力因数随模型尺寸的增加而减小，模型中网格的局部阻力因数也成比例地减小。当开口率相似时，多孔板栅的局部电阻系数大于金属丝网的局部电阻系数，方孔栅的局部电阻系数大于圆孔的局部电阻系数。随着孔径比的增加，金属丝网的局部电阻系数的减小率小于多孔板栅格的减小率。每个网格中的局部电阻系数随网格组数量的增加而减小。多孔板栅的局部电阻系数大于丝网栅的局部电阻系数，方孔栅的局部电阻系数大于圆孔的局部电阻系数。随着孔径比的增加，金属丝网的局部电阻系数的减小率小于多孔板栅格的减小率。每个网格中的局部电阻系数随网格组数量的增加而减小。多孔板栅的局部电阻系数大于丝网栅的局部电阻系数，方孔栅的局部电阻系数大于圆孔的局部电阻系数。随着孔径比的增加，金属丝网的局部电阻系数的减小率小于多孔板栅格的减小率。每个网格中的局部电阻系数随网格组数量的增加而减小。