Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes

The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which as supply for buildings mines and surrounding areas. efficient performance this strongly depends on thermal process between HET its cemented paste backfill body (CPB). In study, validated simulation model is established investigate CPB, nonuniformly distributed properties CPB are fully considered. results indicate that increase porosity has negative effect CPB. With porosity, decreased rate conductive transfer could up approximately 18%. conditions with seepage flow, capacity improved. Generally, higher hydraulic conductivity corresponds When velocity rose from 2 × 10−6 6 m/s, achieved 114% 1.843 3.957 W/(m·K). Furthermore, it was found accumulates along flow direction, enhancing influencing radius direction. Thus, arrangement HETs should take into account effect. This proposed provide reference parameter determination optimization CMBG systems.