Gas Migration in EBS and Geosphere (GMT) - Depressurisation of the GMT Cavern

During the course of the experiment, the GMT cavern and the EBS were pressurised to around 600kPa by continuous water injection into the backfill. Depressurisation of the cavern was achieved by stepwise reduction of water injection into backfill and a controlled extraction of water from the backfill and silo.

In total some 30m3 of water was removed during the dewatering stage.


The GTS underground facilities are also available to interested 3rd parties for underground testing and research. The GTS offers cost-effective access to a fully developed, well characterised underground research facility with round the year logistical support - please contact Dr. Ingo Blechschmidt, Head of the Grimsel Test Site, for further details.