用于现场测量深层岩土导热系数的简化方法

为便于工程上实现应用现场测量确定实际介质的物性，采用一种简化的传热分析方法确定深层岩土导热系数。该方法不需要测量钻孔中埋管的具体位置、上升管和下降管之间的距离以及埋管和回填材料的特性等参数，可消除上述参数测量带来的误差。通过现场测量地下埋管回路的加热热流、回路循环水流量以及回路出入口水温度随时间的变化，利用简化分析和最优化估计方法，确定了某工地地下岩土的导热系数，检验证实了该方法的实用性和可靠性。

A Simplified Method for On-site Measurement of the Thermal Conductivity of Deep-layer Rock Soil

To facilitate the on site measurement of physical properties of media in engineering applications, a simplified heat transfer analytical method is proposed to determine the thermal conductivity of deep layer rock soil. The method under discussion does not need exact information about the following parameters: the specific location of an embedded tube in a borehole, the distance between a riser tube and a downcomer, and the physical properties of the embedded tube and backfill material, etc. As a result, all errors brought about by the measurement of the above parameters can be eliminated. An on site measurement was taken of the heat flux of an embedded tube loop, the loop circulating water flow rate and the time dependent change of inlet and outlet water temperature of the loop. On this basis and by utilizing a simplified analytical and optimized evaluation method the thermal conductivity of underground rock soil on a certain working site was determined, thus verifying and confirming the practicality and reliability of the recommended method.