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针对热响应试验中2次测试间地温未恢复的情况,提出了一种基于线热源叠加法计算岩土平均导热系数的方法,根据时间函数和流体平均温度之间的线性关系计算得到岩土导热系数。建立了地埋管换热器的线热源模型,对3个钻孔分别依次进行了高、低2种输入功率的热响应测试,2次测试间地温未完全恢复至初始地温。分别采用常规线热源法和线热源叠加法对第2次测试结果进行分析,采用线热源叠加法2次测试结果偏差明显减小。
Aiming at the situation that the ground temperature does not recover between the two tests in the thermal response test, a method of calculating the average thermal conductivity of geomaterials based on the superposition of linear heat sources is proposed. According to the time function and the linear relationship between the average temperature of the fluid, coefficient. The heat source model of ground heat exchanger was established. The thermal response of high and low input power to the three boreholes was tested in succession. The ground temperature did not return completely to the initial ground temperature between the two tests. The results of the second test were analyzed by the conventional line heat source method and the line heat source superposition method, respectively. The deviation of the second test by the line heat source superposition method was significantly reduced.