Abstract: Ground thermal properties are critical for ground source heat pipe (GSHP)systems design and operation.These properties are usually measured in situ with a polyethylene U tube buried in a borehole with the depth of about 100 m.So the model describing the heat transfer between buried U tube and the ground is very important for the in situ  measurement.The solid cylindrical heat source model considers the inner borehole of a vertical buried loop of ground heat exchanger (GHE) as a solid and heat flux is imposed on the borehole wall，so it is more approximate than the hollow cylindrical heat source model which assumes the inner borehole has no mass，and also more approximate than the line source model which regards the buried U tube as a line heat source with a diameter of zero.This paper used the solid cylindrical heat source model，together with the parameter estimation method，to determine ground thermal properties in situ.Application in real GSHP projects indicates that the measured ground thermal properties were credible and can be used for GSHP systems design.

Key words: geothermal heat exchanger, ground thermal property, solid cylindrical heat source, measurement

摘要： 一维实心圆柱面热源模型比现有的线热源模型和空心圆柱面热源模型能更好地描述竖直地埋管换热器与周围岩土的的传热过程。利用一维实心圆柱面热源模型结合参数估计方法建立了一种可用于现场测量确定岩土热物性参数的方法。利用该方法对实际工程进行了测试分析，结果表明该方法得到的地下岩土热物性参数可信，可以用于工程设计。

关键词: 地热换热器, 岩土热物性, 实心圆柱面热源模型, 测量方法