地下水流向对大型地埋管群热量运移影响分析*
摘要：
为研究实际大型地埋管群工程中不同地下水流向的热影响差异,以郑州市浅层地热能示范工程为研究对象,通过地温监测和数值模拟,对上游垂直、下游平行地下水流向不同深度的地温差异进行了分析。结果表明:上游垂直地下水流向热影响半径为4 m,下游平行地下水流向热影响半径为5 m;随着与换热区距离增大,径向、垂向热影响均减弱;上部含水层厚有利于岩土体换热,大部分热量在上层扩散,深部岩土体分层对热量运移影响减弱。
Abstract：
In order to study the thermal influence difference of different groundwater flow direction in the actual large-scale buried pipe group projects, taking the shallow geothermal energy demonstration project of Zhengzhou city as the research object, the differences in ground temperature at different depths for upstream vertical and downstream parallel groundwater flow directions are analysed through ground temperature monitoring and numerical simulation.The results show that the thermal influence radius is 4 m for the upstream vertical groundwater flow direction and 5 m for the downstream parallel groundwater flow direction. The radial and vertical thermal influences are weakened with the increase of the distance from the heat exchange zone.The thick upper aquifer is conducive to the heat exchange of rock and soil. Most heat diffuses in the upper layer, and the influence of deep rock and soil stratification on heat transfer is weakened.
Keywords:groundwater flow direction; buried pipe group; heat transfer; ground temperature monitoring; thermal influence radius; layered rock and soil