Databank

Workreport 2007-12

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Name:

Ground Penetrating Radar Measurements at the ONKALO Research Tunnel and Eastern Part of the Olkiluoto Investigation Area at July 2006

Writer:

Sipola, V., Tarvainen, A-M.

Language:

English

Page count:

45

Summary:

Ground Penetrating Radar (GPR) measurements were carried out at ONKALO research site in summer 2006. Measurements included 400 metres of measurements inside ONKALO access tunnel and about 1800 metres of measurements on the ground, at the eastern parts of Olkiluoto investigation area.

The purpose of the measurements done inside the access tunnel was to investigate, whether it would be possible to locate deformation structures or long fractures in the rock mass below the tunnel. The purpose of the measurements made on top of the ground was to investigate, whether it would be possible to locate glacio-isostatic faults from the soils. A secondary target was to try and locate the rock surface.

The chosen part of ONKALO tunnel was measured using five different frequencies, which enabled comparing the results to each other. It also enabled getting a higher resolution picture of the top rock, than what would have been possible using only one low-frequency antenna. The on-the-ground measurements were measured using only one frequency.

Keywords:

Ground Penetrating Radar, ONKALO

File(s):

Ground Penetrating Radar Measurements at the ONKALO Research Tunnel and Eastern Part of the Olkiluoto Investigation Area at July 2006 (pdf) (5.5 MB)


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