As a device for efficient heat transfer working without external power supply or control instrumentation, a two-phase closed thermosyphon (TPCT) is an engineering instrument for protecting permafrost under embankments from thawing. The process and mechanism of heat transfer in TPCT embankments were well investigated using experimental and theoretical methods. However, the mechanical performance of TPCT embankments is the most key factor controlling safe operation, but it is sometimes ignored. In particular, there are many TPCT embankments located in the earthquake-prone Qinghai-Tibet Plateau (QTP), and their seismic performances dominate their safe operation. To study the seismic characteristic of the TPCT embankment, we established a thermodynamic model for TPCT embankments and selected a unilateral TPCT embankment to simulate the seismic responses over four representative seasons after 10 years in service. The numerical results show the TPCT embankment has lower temperature distributions compared with that of the embankment without TPCTs, and its temperatures exhibit seasonal differences, resulting in differential seismic responses. In general, throughout the year, the seismic responses of the TPCT embankment are more intensive on October 15 and less intensive on January 15. Moreover, distinct sliding planes appear in the TPCT embankment. Therefore, additional reinforcement measurements should be designed to improve the seismic behavior of the TPCT embankment according to the thermal regimes and seismic response characteristics. Meanwhile, this study is a theoretical reference for the construction, maintenance and further study of other TPCT embankments in permafrost regions.

作为无需外部电源或控制仪器即可进行高效传热工作的设备，两相闭式热虹吸管（TPCT）是一种工程工具，可保护路堤下的永久冻土不融化。利用实验和理论方法对TPCT路堤的传热过程和机理进行了深入研究。然而，TPCT路堤的机械性能是控制安全操作的最关键因素，但有时会被忽略。特别是，在地震多发的青藏高原（QTP）上有许多TPCT路堤，其抗震性能主导着其安全运行。为了研究TPCT路堤的抗震特性，我们建立了TPCT路堤的热力学模型，并选择了单边TPCT路堤来模拟服役10年后四个代表性季节的地震响应。数值结果表明，与无TPCT的路堤相比，TPCT的路堤温度分布更低，并且其温度表现出季节性差异，从而导致不同的地震响应。通常，全年中，TPCT路堤的地震响应在10月15日更加强烈，而1月15日则不那么强烈。此外，TPCT路堤中出现了明显的滑动面。因此，应根据热状况和地震响应特征设计附加的加固措施，以改善TPCT路堤的地震性能。与此同时，