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以新疆塔什库尔干河齐热哈塔尔水电站引水隧洞为例,使用ANSYS Workbench软件建立了热-固耦合分析模型,采用数值模拟的方法分析了高地热、高地应力、压力水头311.49 m条件下,水工隧洞运行期衬砌的稳定性。结果表明:隔热层的设置能明显改善一期混凝土衬砌的受力情况,衬砌平均主应力减小约46%,但对二期混凝土几乎没有影响,且衬砌结构的平均位移增大约14%;设置隔热层能显著提高一期混凝土的安全性,但二期混凝土除两底角安全系数大于1外,其余部位的安全系数仍小于1;隔热层+一期混凝土+二期混凝土组成的支护结构有其合理之处,但必须使用高性能混凝土提高支护结构的抗裂性能,才能满足工程安全的要求。
Taking the water diversion tunnel of Qi’er-Qatar Hydroelectric Power Station in Taschurgan River in Xinjiang as an example, a thermo-mechanical coupling model was established by using ANSYS Workbench software. The numerical simulation method was used to analyze the geothermal, high ground stress and pressure head conditions of 311.49 m. Tunnel lining stability during operation. The results show that the installation of thermal insulation layer can obviously improve the stress of the first - phase concrete lining, the average principal stress of the lining decreases about 46%, but has little influence on the second - stage concrete and the average displacement of the lining structure increases about 14%. The insulation layer can significantly improve the safety of the first phase of concrete, but the safety factor of the second phase of concrete is still less than 1, except for the safety factor of the bottom two corners is greater than 1; the second layer of concrete is composed of the first layer of concrete + the second phase of concrete Support structure has its reasonable place, but must use high-performance concrete to improve the crack resistance of support structure in order to meet the engineering safety requirements.