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为了准确获得地下岩土体热物性参数,基于线热原模型理论,详细分析了岩土体热物性现场热响应测试的理论模型及数据处理方法。以丹阳市滨江新城DYG084号100m深单U型垂直埋管试验孔恒热流散热试验为例,采集现场测试数据得到埋管供回水温度响应曲线,采用了基于线热源模型的数据拟合法对试验数据进行分析处理。数据分析表明,土壤的初始地层温度为19.23℃,夏季工况下,岩土体综合导热系数、容积比热容和钻孔内热阻分别为2.29W/(m·K)、2.33×106J/(m3·K)和0.143(m·℃)/W;试验表明,本文所建立的地下岩土体热物性测试数据分析模型是可行的,可应用于实际地源热泵工程地下岩土体热物性测试数据的处理分析。
In order to obtain the thermal physical parameters of underground rock and soil accurately, the theoretical model and data processing method of on-site thermal response test of geothermal body are analyzed in detail based on the theory of linear pyrogen model. Taking Danyang City Binjiang New City DYG084 100m deep single U-shaped vertical borehole heat and moisture dissipation test as an example, field test data were collected to obtain the temperature response curve of the pipe for water supply and return, the data fitting method based on linear heat source model was used to test Data analysis and processing. Data analysis shows that the initial formation temperature of soil is 19.23 ℃. Under summer conditions, the thermal conductivity, volume specific heat capacity and thermal resistance of the rock mass are 2.29W / (m · K) and 2.33 × 106J / (m3 · K) and 0.143 (m · ° C) / W respectively. The experiment shows that the model of thermal property test data of underground rock and soil established in this paper is feasible and can be applied to the thermophysical properties data of the underground geothermal ground source heat pump project Processing analysis.