Research Project GeoTU6

GeoTU6 – a geothermal Research Project for Tunnels

1 Energy segment provided with absorber pipes at the reinforcement cage coupled in the annular joint

2 Cross-section Fasanenhof Tunnel absorber system driven by mining means [7]

3 Absorber system prior to installation of the inner shell reinforcement in the Fasanenhof Tunnel

4 Energy block in the Fasanenhof Tunnel: absorber pipes between inner and outer shells, connecting pipe to the main pipe in the floor [5]

5 Presentation of the measured rock heat conductivities throughout the length of the tunnel; measured perpendicular to the bedding

6 Average values of the heat conductivity of roughly 400 rock samples (value in brackets = number of tests)

Owing to the high degree of earth contact underground cavities are at the centre of geothermal deliberations for low energy systems. Within the scope of a research project known as GeoTU6 a geothermal test section was set up at the Stuttgart-Fasanenhof Tunnel. The project is described in the following report.

Underground cavities are at the centre of geothermal deliberations for low energy systems. They involve a high degree of earth contact and can also take over a thermal-energy function in addition to the original static-constructional one with relatively little added technical outlay. Examples from tunnelling are known both from bores created by conventional mining means as well as by mechanised construction methods. They are by and large restricted to the
D-A-CH countries Germany, Austria and Switzerland.

During the production of the Stuttgart-Fasanenhof urban rail link (U6) by the Stuttgarter...