Gas Migration in EBS and Geosphere (GMT) - Removal of sand/bentonite by layers to top of concrete silo

The upper most layers of the sand bentonite were very carefully excavated to minimise the potential disturbance of the silo, to avoid damage of the instrumentation and to preserve any structural alteration of the layers below which may have arisen from the water and gas injection.

Excavation pattern for the GMT

Ingo Blechschmidt (Nagra) carefully removes the sand/bentonite from layer 9


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.