Databank

Workreport 1997-3

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Name:

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR1

Writer:

Heikki Hämäläinen

Language:

Finnish

Page count:

370

Summary:

Working report: HYDRAULIC CONDUCTIVITY MEASUREMENTS AT
OLKILUOTO, BOREHOLE OL-KR1

ABSTRACT

As a part of the detailed site investigations hydraulic conductivity
measurements were carried out in borehole KR1 at Olkiluoto in
Eurajoki. Olkiluoto is one of the three areas selected as possible
locations for repository of spent nuclear fuel. The objective was to
investigate the distribution of hydraulic conductivity in the sur-
rounding bedrock volume.

Out of the total measurable length of 960,85 m in the borehole
224 m was measured with 2 m packer separation. A total of
complete 112 tests were made. Additionally some tests were
made to check the real depth of fractures at known locations.
Double-packer constant-head method was used throughout with
generally 200 kPa head. Both injection and fall-off stages lasted
normally 20 minutes. Test section was stabilised for at least 5
minutes before the injection to find out the natural pressure.
Some predetermined sections were, however, stabilised up to
several hours. Two transient interpretations (Horner and 1/Q) and
one stationary-state (Moye) interpretation were made immediately
after the measurement.

Hydraulic Testing Unit, HTU-system, designed and manufactured
by Fiskars Geoinstruments to a specification of Teollisuuden
Voima Oy, was used and operated by a crew of Geopros Ltd.
HYDRAULIC CONDUCTIVITY MEASUREMENTS AT
OLKILUOTO, BOREHOLE OL-KR1

ABSTRACT

As a part of the detailed site investigations hydraulic conductivity
measurements were carried out in borehole KR1 at Olkiluoto in
Eurajoki. Olkiluoto is one of the three areas selected as possible
locations for repository of spent nuclear fuel. The objective was to
investigate the distribution of hydraulic conductivity in the sur-
rounding bedrock volume.

Out of the total measurable length of 960,85 m in the borehole
224 m was measured with 2 m packer separation. A total of
complete 112 tests were made. Additionally some tests were
made to check the real depth of fractures at known locations.
Double-packer constant-head method was used throughout with
generally 200 kPa head. Both injection and fall-off stages lasted
normally 20 minutes. Test section was stabilised for at least 5
minutes before the injection to find out the natural pressure.
Some predetermined sections were, however, stabilised up to
several hours. Two transient interpretations (Horner and 1/Q) and
one stationary-state (Moye) interpretation were made immediately
after the measurement.

Hydraulic Testing Unit, HTU-system, designed and manufactured
by Fiskars Geoinstruments to a specification of Teollisuuden
Voima Oy, was used and operated by a crew of Geopros Ltd.

Keywords:

File(s):

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR1 (pdf) (5.2 MB)


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