本文为国家自然科学基金（编号 41302189）、中国地质调查项目（编号 DD20189112）、中国地质调查局地热资源调查研究中心与自然资源部地热与干热岩勘查开发技术创新中心共同资助的成果。
现场热响应试验方法可以获得换热深度内岩土体热物性参数的平均值，能够较真实地模拟地源热泵的实际运行情况，在地源热泵工程勘查设计阶段得到了广泛的应用。本文基于华北平原89个钻孔的热响应试验数据，对地表以下200 m深度内岩土体的综合导热能力进行分析，并对影响综合热导率的因素进行了探讨。结果表明，华北地区综合热导率大部分处于1. 50~2. 16 W/(m·K)之间（25%<累积概率<75%）。在富水性较好、岩石颗粒粗、地下水径流速度较快的区域，地埋管换热器的换热效果明显高于富水性差、岩石颗粒细、地下水径流速度慢的地区。地层岩性、含水率特征和地下水径流条件是影响岩土体综合热导率的主要因素。其中200m深度以内不同地区岩土体的岩性组成各不相同、地下水位埋深不同，是造成综合热导率差异的重要影响因素，地下水径流对岩土体的综合导热能力有促进作用。用无量纲Peclet值（Pe）判断地下水流动对换热过程影响的大小，在0. 28＜Pe＜0. 84的情况下，Pe值增加47%，岩土体综合导热能力增加7. 56%。
Average thermal parameters of the whole heat exchanger can be measured by in situ thermal response test (TRT). TRT can simulate the actual operation of the ground source heat pump (GSHP) and has been widely used in designing the GSHP. Data of TRTs from 89 different boreholes in China were collected and analyzed. Effective thermal conductivity (λeff) of the ground within 200 m was analyzed and its influencing factors were evaluated. Results show that thermal conductivity from TRT results are mostly between 1. 50 and 2. 16 W/(m·K) with cumulative probability between 25%~75%. Generally speaking, underground materials with coarse grain, high water yield and strong groundwater velocity show better heat transfer capacity. Lithology, water content and groundwater flow are import influencing factors for effective thermal conductivity. The regional variability of the underground material and groundwater level depth within 200m are important factors controlling effective thermal conductivity. Groundwater flow also plays an important role and the modified Peclet number (Pe) is introduced to define the effect of groundwater flow. When Pe is between 0. 28 and 0. 84, a 47% increase in Pe number results in a 7. 56% increase in the effective thermal conductivity of the ground.
王婉丽,王贵玲,刘春雷,李郡.2020.华北平原主要城市浅层岩土综合导热能力研究——基于现场热响应试验分析[J].地质学报,94(7):2089-2095.
WANG Wanli, WANG Guiling, LIU Chunlei, LI Jun.2020. A study of effective thermal conductivity in the North China Plain based on in situ thermal response tests[J]. Acta Geologica Sinica,94(7):2089-2095.
