基于线热源模型的岩土热导率测量探针研制

Development of the probe for measuring thermal conductivity of rock and soil based on linear heat source model

基于线热源模型,研制了一种可应用于室内和原位实验的岩土热导率测量探针。通过数值模型模拟了探针的传热过程,结果表明探针整体轴向传热不明显,符合线热源模型假设。在设定的加热参数下,当测量时间大于40 s时,热导率计算精度满足要求。用室内制备黏性土样品测试探针性能的实验结果显示,探针测量岩土热导率准确,具有测量快速、操作方便等特点。该探针可应用于岩土原位测量实验和实习课程,有助于加深学生对线热源模型的理解,培养学生的创新能力。

Based on the linear heat source model, a probe for measuring the thermal conductivity of rock and soil is developed, which can be used in indoor and in-situ experiments. The heat transfer process of the probe is simulated by numerical model. The results show that the axial heat transfer of the probe is not obvious, which conforms to the assumption of linear heat source model. Under the set heating parameters, when the measurement time is greater than 40 s, the calculation accuracy of thermal conductivity meets the requirements. The experimental results of testing the performance of the probe with clay samples prepared indoor show that the probe is accurate in measuring the thermal conductivity of rock and soil, and has the characteristics of rapid measurement and convenient operation. The probe can be applied to geotechnical in-situ measurement experiments and internship courses, which is helpful to deepen students’ understanding of linear heat source model and cultivate students’ innovation ability.