Buried pipe heat exchange enhancing system and method based on composite backfill

The invention provides a buried pipe heat exchange enhancing system and method based on composite backfill. The buried pipe heat exchange enhancing system mainly comprises a drilling backfill material, a buried pipe heat exchanger and an operation monitoring device. And a permeable material is used for backfilling below the underground water level. Temperature change generated by heat exchange between water in the pipeline and surrounding underground water enables molecules of the underground water around the heat exchange pipe and water molecules far away from the heat exchange pipe to generate energy difference, fluid is driven to flow, the phenomenon that heat drives the underground water to flow is formed, heat or cold energy emitted by the heat exchange pipe is taken away by the flowing underground water, and a heat flow channel is formed. The heat transfer resistance is greatly reduced, and the heat accumulation phenomenon is reduced. And above the underground water level, the bentonite and fine sand mi