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Table 1 Features of the main in situ heating tests performed in the Mont Terri rock laboratory

From: Performance of the Opalinus Clay under thermal loading: experimental results from Mont Terri rock laboratory (Switzerland)

Experiment HE-B (HE) HE-D HE-E
Borehole/tunnel Vertical Horizontal Horizontal
Borehole/tunnel diameter (m) 0.3 0.3 1.3
Heater/liner diameter (m) 0.1 0.3 0.3
Heater length (m) 2.02 2 × 2 2 × 4
Max. heater temperature (°C) 100 100 140
Backfill thickness (m) 0.1 0.5
Backfill material Compacted blocks (Febex bentonite) Granular bentonite (MX80, MX80 + sand)
Backfill hydration Artificial Natural
Heating duration 18 months 11 months Long term
Heating period February 2002–August 2003 March 2004–February 2005 June 2011–?