In order to solve the heat-harm,create a comfortable and safe working condition,and promote the development of cooling technology in deep-mine,a cooling and heat-collecting system based on direct expansion ground-coupled heat pump(DX-GCHP)was established,and laboratory test was performed to study the operation condition of the system and its cooling effect in tailings.The system performing results indicate that the temperature distribution in soil drops from 45-55 ℃ to 20-25 ℃ during room temperature(RT)of 29.1-34.3 ℃,and the heat conduction...