采用相似比例模型试验,以长大双线铁路隧道标准断面为基础,探讨不同粉尘粒径、始发尘量、回风速率对粉尘运移特性的影响。结果表明:随粉尘粒径的增大,断面粉尘峰值浓度呈现线性降低趋势,粉尘直径越大受风流场的推动扩散作用越明显;初始粉尘浓度对粉尘运移的影响主要表现随浓度场增大,浓度峰值上升,粉尘扩撒速率降低,受风流的扩散作用相对较小;随纵向风速的增大,各监测断面峰值浓度下降,且峰值出现时间提前,同时,断面浓度的降低速率得到一定程度的提升;台车对粉尘扩散的滞后效应与粉尘粒径初始粉尘浓度呈正相关,与纵向回风速度呈负相关;工程作业段回风风速1.0 m/s时,能够有效降低粉尘峰值浓度。
Using similar proportional model test, the effects of different dust particle size, initial dust volume and return air rate on dust transport characteristics are explored based on the standard cross section of a long double-track railway tunnel. The results show that: With the increase of dust particle size, the peak dust concentration in the section shows a linear decrease, and the larger the dust diameter is, the more obvious the diffusion effect is driven by the wind flow field. The effect of initial dust concentration on dust transport mainly shows that with the increase of the concentration field. The peak concentration rises, the dust spreading rate decreases, and the diffusion effect by wind flow is relatively small. With the increase in longitudinal wind speed, the peak concentration in each monitoring section decreases, and the peak time appears earlier. Meanwhile, the reduction rate of section concentration is enhanced to a certain extent. The hysteresis effect of dolly on dust diffusion is positively correlated with the initial dust concentration of dust particle size, and negatively correlated with the longitudinal return wind speed; the peak dust concentration can be effectively reduced when the return wind speed of engineering operation section is 1.0 m/s.
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