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Numerical simulation of ventilation and dust suppression system for open-type TBM tunneling work area

机译：敞开式TBM掘进工作区通风抑尘系统的数值模拟

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In order to study the characteristics of the ventilation and dust suppression system for open-type TBM tunneling work area in a 08.53 diversion project, the numerical simulation method is adopted, and a three-dimensional steady airflow model, a dust flow model as well as other related flow characteristic equation models are established by considering the dust production mechanism of TBM construction. Besides, corresponding simulation models validated by experiment are established using CFD software, and the impacts of the main vent location, the air baffle length in the main beam and the exhausting air flow quantity on flow field distribution and dust flow behavior in open-type TBM tunneling work area are investigated. The results show: when the main vent is located 70-80 m away from the working face, the ventilation in TBM tunneling work area is optimal; when the air baffle is as long as the main beam, the dust collection efficiency is the highest, reaching 89.4%; under the condition that the exhausting air flow quantity is less than half of the ventilation air flow quantity required by energy consumption and the minimum backflow velocity, the best dust suppression effect can be achieved when the exhausting air flow quantity is 40% of the ventilation air flow quantity. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为研究08.53导流工程中开放式TBM掘进工作区通风抑尘系统的特点，采用了数值模拟方法，并建立了三维稳定气流模型，粉尘流动模型以及通过考虑TBM施工的扬尘机理，建立了其他相关的流量特性方程模型。此外，利用CFD软件建立了相应的实验模型，并验证了敞口式TBM中主出风口位置，主梁的导流板长度和排风量对流场分布和粉尘流动行为的影响。调查隧道工作区。结果表明：当主出风口距离工作面70-80 m时，TBM掘进工作区的通风效果最佳。当导流板与主梁一样长时，除尘效率最高，达到89.4％。在排风量小于能耗所需的排风量的一半且回流速度最小的条件下，排风量为排风量的40％时，可获得最佳的抑尘效果流量。 （C）2016 Elsevier Ltd.保留所有权利。

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