不同测试条件下岩土体热导率对比分析研究  

Thermal conductivity of rock and soil under different test conditions

作　　者：贾子龙 郑佳 李娟 刘爱华 李富 JIA Zilong;ZHENG Jia;LI Juan;LIU Aihua;LI Fu(Geothermal Research Institute of Beijing,Beijing 102218,China;Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing 102218,China)

机构地区：[1]北京市地热调查研究所,北京102218 [2]自然资源部浅层地热能重点实验室,北京102218

出　　处：《城市地质》2023年第1期49-54,共6页Urban Geology

基　　金：通州区南部(751 km2)重大地质问题调查与评价项目浅层地温能资源调查与评价专题资助。

摘　　要：岩土热导率是浅层地热能开发利用评价的重要参数,依据实际工程案例中的测试孔开展了实验室测试和现场热响应测试,对取得的岩土体热导率进行了对比分析。结果显示,在第四系松散沉积物中,岩土热导率与天然含水率、孔隙比呈负相关;岩土平均热导率在大功率(9 kW)条件下比小功率(6 kW)大;同一测试孔,实验室与现场热响应测试取得的岩土体热导值存在差异,实际工程应根据不同参数需求和应用场景,选择合适的测试方法。Geotechnical thermal conductivity is an important parameter in the evaluation of the exploitation and utilization of shallow geothermal energy.We conducted both laboratory and field thermal response tests on test holes in actual engineering cases and analyzed the thermal conductivity obtained.The results show that the thermal conductivity is negatively correlated with the natural water content and the porosity ratio in the Quaternary loose sediments.The average thermal conductivity of rock and soil is higher at high power(9kW)than at low power(6kW).For the same test hole,the thermal conductivity of rock and soil bodies obtained differs for laboratory test and field thermal response test.Therefore in actual projects,appropriate testing method should be selected according to different parameter requirements and application scenarios.

关 键 词：热导率 地源热泵系统 实验室测试 现场热响应测试 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程] P314[天文地球—固体地球物理学]