Thermal analysis and air temperature prediction in TBM construction tunnels

Thermal analysis and air temperature prediction in TBM construction tunnels
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TBM 施工隧道热分析和气温预测

DOI:
10.1016/j.applthermaleng.2019.113822
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发表时间:
2019-07
影响因子:
6.4
通讯作者:
Hu Hui
Hu Hui
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Feng;Luo Feiyu;Huang Yubing;Zhu Lei;Hu Hui

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本文首先对隧道掘进机(TBM)开启和关闭状态下的室内空气温度进行了现场测试。随后开发了一个模拟模型,并重现了试验。采用该模型研究了围岩温度、掘进机利用率和施工通风对掘进机机房内空气温度的影响。结果表明,空气温度在20 min后达到稳定状态。随着RT和TBM利用率的增加,稳态气温呈线性上升。当RT大于17.7 °C或全层空气质量利用率大于38.0%时,气温高于28 °C。文中还讨论了施工通风的影响。空气温度随新风量的增加呈抛物线型下降,而随新风量的增加呈线性增加。结果表明,通风是降低TBM室内空气温度的一种非常有效的方法。但当RT高于45 °C时,不足以提供可行和舒适的热环境。
In this work, field tests on the air temperature in the TBM (tunnel boring machine) room are initially carried out for TBM on and off, respectively. A simulation model is subsequently developed and reproduced the tests. The comparison shows an acceptable agreement, thus this model is adopted to study effects of RT (rock temperature), TBM utilization factor and construction ventilation on the air temperature in the TBM room. The results show the air temperature reaches a steady state after 20 min. The steady air temperature increases linearly with the increase of RT and TBM utilization factor. The air temperature is higher than 28 °C when RT is greater than 17.7 °C or when TBM utilization factor is greater than 38.0%. Effects of construction ventilation are discussed as well. The air temperature is observed to decreases in a form of parabola with the increase of fresh air volume, whereas it increases linearly with the increase of fresh air temperature. As a result, it can be found that ventilation is a very useful method to reduce the air temperature in the TBM room. But it is not enough to provide a workable and comfortable thermal environment when RT is higher than 45 °C.
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发表时间: 2019-02
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