为了研究高地温隧道施工环境中的降温措施及效果,探究其特征并确定设计参数,以成昆铁路保安营隧道工程为依托,采用自制模型试验平台,就不同隧道回风速度、风管出口温度和不同喷雾流量对高地温隧道中不同截面位置温度场分布影响问题进行了深入分析。结果表明,风速主要影响各隧道截面的起始降温时刻,风温主要影响隧道截面的降温效率,而风速风温均对降温速率有很大的影响;随着隧道断面位置距离掌子面越远,降温速率和降温效率均会有较大程度的衰减;不同位置的喷雾流量则对降温速率影响不同,降温效率从高到低排序为:喷头后方部分隧道流域>风管出口前部分隧道流域>两者间位置的隧道流域。
In order to study the cooling measures and effects in the construction environment of high geothermal tunnels and to explore their characteristics and determine the design parameters, a self-made model experimental platform was used, based on the Baoanying tunnel project in the Chengdu-Kunming railway. This platform deeply analyzed the influence of different tunnel return air velocities, fresh air initial temperatures, and different spray flows on the temperature field distribution in different cross-section positions in high ground temperature tunnels. The results show that wind speed mainly affects the initial cooling time of each tunnel section, while wind temperature mainly affects the cooling efficiency of the tunnel section. Both wind speed and wind temperature have a significant influence on the cooling rate. As the tunnel section is farther away from the tunnel face, the cooling rate and cooling efficiency will be greatly attenuated; The spray flow rate at different positions has different effects on the cooling rate, and the order of cooling efficiency from high to low is: part of tunnel basin behind nozzle > part of tunnel basin in front of air duct outlet > tunnel basin in between.
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