基于线热源模型计算岩土热物性参数的研究
Rock-soil thermal physical parameter calculation based on line heat source model
摘要：
针对温州市某地埋管地源热泵项目，通过岩土热响应试验获取原始测试数据。基于线热源模型，分别采用斜率法与非线性曲线拟合法，计算得到土壤的导热系数与单位体积热容随测试时间变化的规律，并利用非线性曲线拟合法分析了初始测试数据对计算结果的影响。结果表明：斜率法与非线性曲线拟合法具有相同的稳定性，但斜率法的计算结果较大地偏离了推荐值；非线性曲线拟合法受初始测试数据的影响较小，计算结果较为接近推荐值；在地下水丰富地区，岩土热响应测试得到的土壤热物性参数与推荐范围存在偏差。
Abstract：
Obtains the original test data by in-situ thermal response test from a ground-source heat pump project in Wenzhou. Based on the line heat source model, calculates the rule of heat conduction coefficient and heat capacity per unit volume of soil changing with the test time using slope method and non-linear curve fitting method respectively, and analyses the influence of the initial test data on the result of calculation by non-linear curve fitting method. The results indicate that the slope method has the same stability as the non-linear curve fitting method, but its calculation results deviate from the recommended values greatly. The non-linear curve fitting method is less affected by the initial test data, and the calculation results are close to the recommended range. There is a deviation between the soil thermal physical parameters obtained by in-situ thermal response test and the recommended range in the areas rich in groundwater.
Keywords:rock-soil, thermal response test, line heat source model, heat conduction coefficient, heat capacity per unit volume, slope method, non-linear curve fitting method