Quality requirements for borehole heat exchanger backfilling materials
Participating PartnersSubproject 3 focuses on investigations of the actual behaviour of backfill materials in the subsurface. On the one hand, this is done to improve the understanding of the formation of faults, and on the other hand, it shows which situations are uncritical for the formation of faults while using shallow geothermal sources. Therefore, investigations beyond laboratory-scale are carried out to enable a realistic representation of a borehole heat exchanger. In 5 subprojects various problems are addressed:
- TP 3.1: Filtration characteristics of BHE backfilling materials
- TP 3.2: Determination of the hydraulic permeability of system samples
- TP 3.3: Realistic combination of investigation aspects of filtration effects
- TP 3.4: Backfill material quality check for BHEs under real conditions
- TP 3.5: New backfilling concept for BHE´s