Abstract This study aims to examine whether clean production can be achieved by using a ventilation dust removal system in a tunnel being constructed using a tunnel boring machine (TBM). The section between the Guizhou-Road Station and the Guipaijing Station on the No. 1 line of the Qingdao Metro was selected as the study area, and the effectiveness of a ventilation dust removal system on the diffusion distance and mean concentration of dust in the excavating area was investigated through the use of a CFD-based numerical simulation. Firstly, it was found that when the first pressure quantity, exhaust quantity, and position of the pressure inlet and exhaust inlet of the ventilation dust removal system all remained unchanged, the secondary pressure quantity corresponding to the optimal dust suppression effect was determined to be 8 m³/s. Next, an orthogonal experiment was performed on the position of the pressure inlet and exhaust inlet and the forced-to-absorbed airflow quantity ratio in order to examine the effect of different combinations on the dust suppression effect in the tunnel. By selecting the dust diffusion distance, mean dust concentration in the tunnel and dust-collecting efficiency as the evaluation indexes, three favorable schemes were determined, from which the optimal scheme was selected. In the optimal combination, the secondary pressure inlet and exhaust inlet were 28 m and 11m away from the tunnel face respectively and the forced-to-absorbed airflow quantity ratio was 1.6. After the scheme’s optimization, the dust diffusion distance in the tunnel was shortened considerably by 53 %, the mean dust concentration was reduced to 1.52E-06 kg/m³, and the dust-collecting efficiency was enhanced by 13.19 %. Under these optimal conditions, a ventilation dust removal system can maximize the operational efficiency and ensure a clean air environment during any production activities.

中文翻译：

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基于正交试验的TBM隧道抑尘清洁生产方案优化

摘要 本研究旨在探讨在使用隧道掘进机（TBM）施工的隧道中使用通风除尘系统是否可以实现清洁生产。选取青岛地铁1号线贵州路站至桂牌井站段为研究区，研究通风除尘系统对开挖过程中粉尘扩散距离和平均浓度的影响通过使用基于 CFD 的数值模拟对区域进行了调查。首先发现，当通风除尘系统的第一压力量、排气量、压力进排气口位置均保持不变时，确定最佳抑尘效果对应的二级压力量为8立方米/秒。下一个，对压力进排气口位置和强制吸风量比进行正交试验，考察不同组合对隧道抑尘效果的影响。以扬尘扩散距离、隧道内平均扬尘浓度和集尘效率为评价指标，确定了3个有利方案，从中选出最优方案。优化组合中，二次压力进风口和排风口分别距掌子面28m和11m，强制吸风量比为1.6。方案优化后，隧道内粉尘扩散距离大幅缩短53%，平均粉尘浓度降至1.52E-06 kg/m³，集尘效率提高了13.19%。在这些最佳条件下，通风除尘系统可以最大限度地提高运行效率，并确保任何生产活动中的空气清洁环境。