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针对高地温隧洞存在的严重高温现象,以齐热哈塔尔水电工程为例,采用ANSYS软件对隧洞围岩高温段自然通风和采取降温措施两种工况进行模拟研究。与实测数据对比分析表明,随着自然通风和降温措施时间的增加,隧洞内部温度逐渐降低,最后达到平衡状态,模拟结果与实测数据基本吻合;同时对于隧洞整体围岩降温周期长、难度大的特点,可采取局部降温的措施达到施工作业要求的温度,这为工程项目的实施提供了可靠参考。
Aiming at the severe high temperature phenomenon in the high temperature tunnel, the Qidian Qatar Hydroelectric Project is taken as an example. The natural ventilation in the high temperature section of tunnel surrounding rock and the cooling measures are simulated by ANSYS software. Compared with the measured data, it is shown that with the increase of time of natural ventilation and cooling measures, the internal temperature of the tunnel gradually decreases and finally reaches the equilibrium state. The simulation results are in good agreement with the measured data. At the same time, the cooling period of the whole surrounding rock of the tunnel is long and difficult Characteristics, can take the local cooling measures to achieve the temperature required for construction operations, which provides a reliable reference for the implementation of the project.