为研究中浅层同轴套管式地埋管换热器周围土壤温度全年变化特性，建立了二维中浅层同轴套管式地埋管换热器非稳态传热模型，基于有限体积法进行求解，并用项目实验数据进行验证。研究结果表明：单独制热制冷工况下，循环方式外进内出对土壤深度100 m温度影响较大，内进外出对土壤深度500 m温度影响较大，夏季工况在外进内出循环方式下更易出现逆向传热现象。第一年冬（夏）季结束时土壤热影响半径小于10 m，随着时间增加土壤热影响半径增大。一个运行周期结束，300 m左右以浅土壤温度升高，300 m左右以深土壤温度降低。通过正交实验可得，冬夏季进水温度对土壤深度为100 m的温度波动影响显著，夏季进水温度对土壤深度为500 m的温度波动影响显著。

To investigate the annual variation characteristics of soil temperature around the medium-shallow coaxial tube ground heat exchanger, a two-dimensional unsteady heat transfer model for the medium-shallow coaxial tube ground heat exchanger was established. The model was solved based on the finite volume method and validated using experimental data from the project. The research findings indicate that under individual heating and cooling conditions, the circulation mode of outer-in and inner-out has a greater impact on soil temperature at a depth of 100 m, while the inner-in and outer-out mode has a more significant effect on soil temperature at a depth of 500 m. During summer conditions, reverse heat transfer is more likely to occur with the outer-in and inner-out circulation mode. At the end of the first winter (or summer) season, the thermal influence radius of the soil is less than 10 m, but this radius increases over time. At the end of one operational cycle, the soil temperature increases at depths shallower than approximately 300 m and decreases at depths deeper than approximately 300 m. Orthogonal experiments reveal that the inlet water temperature in both winter and summer has a notable impact on temperature fluctuations at a soil depth of 100 m, while the inlet water temperature in summer significantly affects temperature fluctuations at a soil depth of 500 m.