不同通风方式对高地温施工隧道通风降温效果影响研究

Study on the Influence of Different Ventilation Methods on the Ventilation and Cooling Effect of High Ground Temperature Construction Tunnel

为了对比不同的通风条件下高地温隧道施工通风降温的效果,利用Fluent建立侧壁压入式通风和混合式通风模型,进行了数值模拟。同时研究了高地温隧道在两种通风方式下隧道内温度和降温速度的分布规律,对比两种通风方式的优缺点,得出降温效果较好的通风方式。结果表明:对于高地温隧道施工,风流速度越大降温效果越明显,且相比于混合式通风,侧壁压入式通风更能有效降低掌子面附近温度,提高施工的安全性和效率,而混合式通风能同时对掌子面和隧道进口附近降温。

In order to compare the cooling effect of ventilation in high ground temperature tunnel construction under different ventilation conditions,fluent was used to establish sidewall press-in ventilation and hybrid ventilation models,and numerical simulations were carried out.At the same time,the temperature and velocity distribution law of the tunnel under the two ventilation modes of the high ground temperature tunnel were studied,and the advantages and disadvantages of the two ventilation methods were compared,and the ventilation method with better cooling effect was obtained.The results showed that for the construction of high ground temperature tunnel,the larger the airflow velocity is,the more obvious the cooling effect is.Compared with the hybrid ventilation,the side wall press-in ventilation can effectively reduce the temperature near the tunnel face and improve the safety and efficiency of the construction,while the hybrid ventilation can cool the tunnel face and the tunnel entrance at the same time.