均质地层非稳态热传导特征分析

Analysis on the Characteristics of Unsteady State Heat Conduction in Homogeneous Rock Mass

基于在均质地层场地内进行的热响应试验,此文通过对地埋管热响应试验观测孔不同深度地温数据与稳态温度场理论分析特征对比,从时间和空间两方面总结了非稳态下均质岩体内竖直地埋管周围的热传导特征。分析发现:该次试验竖直地埋管排热过程中周围地层非稳态地温场的分布特征与根据公式求得的均质无限大介质中线热源排热形成的稳态地温场分布在空间分布形态上有一致性;持续排热工况下竖直地埋管的影响半径为一动态数值,与排热持续时间相关性较大。

Based on the thermal response test conducted in a homogeneous formation site, through analysis and comparasion of geothermal data and steady state temperature field at different, from the aspects of time and space, heat conduction characteristics of homogeneous rock mass surrounding the borehole tube under the unsteady state condition have been summarized. It is found that the distribution characteristics of the unsteady geothermal field of the surrounding strata in the vertical heat dissipation process of this ex periment are consistent with the steady state geothermal field distribution formed by the heat source heat removal of the homogeneous infinite medium obtained by the formula. The influence radius of the vertical buried pipe under continuous heat discharging conditions is a dynamic value, which is highly correlated with the duration of heat removal.