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

Evaluation of EBS following the gas test;
Determination of sand/bentonite properties
Detection of gas- and water-flow paths;
Assessment of the construction methods used;
Evaluation of interface properties (concrete silo/buffer concrete joint, instrumentation arms, risers);
Assessment of concrete silo performance and interaction of concrete and bentonite/sand effects
Recalibration of instrument

The excavation and characterisation of the silo was carried out in a series of eight steps (explained in greater detail in the sections shown in the side menu above):

Step 1: Depressurisation of GMT Cavern.

Step 2: Cutting through the concrete plug.

Step 3: Removal of backfill from GMT Cavern.

Step 4: Investigations from top of Layer 12.

Step 5: Removal of sand/bentonite by layers to top of concrete silo.

Step 6: Investigations in Layers 8 and 7.

Step 7: Removal of Layers 6-5.

Step 8: Restoration of GMT site.

Gas Migration in EBS and Geosphere (GMT) Experiment

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