为研究寒区隧道洞口空气幕保温技术的可行性，采用流体力学原理、叠加原理和贝塞尔特征函数等方法，构建完整的寒区隧道洞口空气幕温度场的理论体系。通过数值模拟，验证该保温技术的可行性，总结该保温技术的保温原则。结果表明：理论计算结果和数值计算结果较为接近，空气幕保温技术可有效防止隧道冻害；空气幕保温技术的保温原则可总结为加热为主，隔风为辅。研究成果可为今后的工程实践提供理论基础。

In order to study the effectiveness of air curtain insulation technology at tunnel portal in cold regions, the principles of fluid mechanics, superposition principle, and Bessel characteristic function were adopted, and a theoretical system for the temperature field of air curtain at tunnel portal in cold regions was constructed. The feasibility of this insulation technology was verified through numerical simulation methods, and the insulation principles of this insulation technology were summarized. The results show that the theoretical calculation results are relatively close to the numerical calculation results, and tunnel freezing damage can be effectively prevented by air curtain insulation technology. The insulation principle of air curtain insulation technology can be summarized as heating is primary and air isolation is secondary. The research results can provide a theoretical basis for future engineering practice.