济南市浅层岩土导热系数影响因素分析

热物性参数的选取对地源热泵系统的换热效率有明显的影响。根据济南市岩土热物性测试数据，通过分析对比获得岩性和导热系数、比热容等热物性参数的相关关系。分析表明，岩石的导热系数普遍大于第四系松散层，岩石导热系数由高到低为沉积岩、岩浆岩、变质岩，灰岩密度、含水率和孔隙率对热物性参数的影响显著。导热系数随密度增大呈线性增加，随含水率增大呈线性减小，随孔隙率增大呈线性减小。得到以孔隙率为单变量的导热系数和热扩散系数的估算公式。所得结论对济南市浅层地热能调查、评价和开发有指导意义。

Analysis of influencing factors on heat conductivities of shallow layer rock and soil in Jinan

The selection of thermal and physical parameters of rock and soil has obvious influence on the heat exchange efficiency of ground source heat pump system. According to test data of thermal properties of rock and soil samples from Jinan, the correlations between the lithology and thermal physical parameters such as thermal conductivity and specific heat capacity. The analysis showed that heat conductivities of rocks were generally higher than that of the Quaternary loose strata. Heat conductivities of rocks ranked from high to low as sedimentary rock，magmatic rock，metamorphic rock. The density, water content and porosity of limestone had significant effects on the thermal physical parameters. Lab measurements indicated heat conductivity of limestone increased linearly with the increase of its density, decreased linearly with increase of its moisture content or porosity. The formulas for estimating heat conductivity and thermal diffusivity with porosity as a single variable were obtained. This work should be instructive to the investigation, evaluation and development of shallow geothermal energy in Jinan.