Large scale gas injection test (Lasgit) performed at the Äspö Hard Rock Laboratory. Summary report 2008

Cuss, R.J.; Harrington, J.F.; Noy, D.J.. 2008 Large scale gas injection test (Lasgit) performed at the Äspö Hard Rock Laboratory. Summary report 2008. British Geological Survey, 122pp. (CR/08/173N) (Unpublished)

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This report describes the set-up, operation and observations from the first 1385 days (3.8 years) of the large scale gas injection test (Lasgit) experiment conducted at the Äspö Hard Rock Laboratory. During this time the bentonite buffer has been artificially hydrated and has given new insight into the evolution of the buffer. After 2 years (849 days) of artificial hydration a canister filter was identified to perform a series of hydraulic and gas tests, a period that lasted 268 days. The results from the gas test showed that the full-scale bentonite buffer behaved in a similar way to previous laboratory experiments. This confirms the up-scaling of laboratory observations with the addition of considerable information on the stress responses throughout the deposition hole. During the gas testing stage, the buffer was continued to artificially hydrate. Hydraulic results, from controlled and uncontrolled events, show that the buffer continues to mature and has yet to reach full maturation. Lasgit has yielded high quality data relating to the hydration of the bentonite and the evolution in hydrogeological properties adjacent to the deposition hole. The initial hydraulic and gas injection tests confirm the correct working of all control and data acquisition systems. Lasgit has been in successful operation for in excess of 1385 days.

Item Type: Publication - Report
Programmes: BGS Programmes > Chemical and Biological Hazards
Funders/Sponsors: SKB (Stockholm)
Additional Information. Not used in RCUK Gateway to Research.: This report made open by author in September 2016. This item has been internally reviewed but not externally peer-reviewed
Additional Keywords: Lasgit, gas injection, bentonite, modelling, hydration, hydraulic, storage, gas entry pressure
NORA Subject Terms: Earth Sciences
Date made live: 06 Sep 2016 10:27 +0 (UTC)

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