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Workreport 1997-21

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Name:

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR2

Writer:

Heikki Hämäläinen

Language:

Finnish

Page count:

607

Summary:

Working report: ABSTRACT

HYDRAULIC CONDUCTIVITY MEASUREMENTS AT EURAJOKI,
OLKILUOTO, BOREHOLE OL-KR2


As a part of the detailed site investigations hydraulic conductivity
measurements were carried out in borehole KR2 at Olkiluoto in
Eurajoki. Olkiluoto is one of the four areas selected as possible loca-
tions for repository of spent nuclear fuel. The objective was to in-
vestigate the distribution of hydraulic conductivity in the surrounding
bedrock volume.
Out of the total measurable length of 1011,54 m in the borehole 380 m
was measured with 2 m packer separation. A total of 190 complete
tests were made. Additionally some tests were made to check the real
depth of the 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 15 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) interpretations were made
immediately after the measurement.
Hydraulic Testing Unit, HTU-system, designed and manufactured by
Fiskars Geoinstruments to a specification of TVO, was used and
operated by the crew of Geopros Ltd.


Keywords: HTU, hydraulic conductivity, constant head test, hydraulic injection test,
Moye, Horner, skin-effect, transient interpretation, stationary flow
ABSTRACT

HYDRAULIC CONDUCTIVITY MEASUREMENTS AT EURAJOKI,
OLKILUOTO, BOREHOLE OL-KR2


As a part of the detailed site investigations hydraulic conductivity
measurements were carried out in borehole KR2 at Olkiluoto in
Eurajoki. Olkiluoto is one of the four areas selected as possible loca-
tions for repository of spent nuclear fuel. The objective was to in-
vestigate the distribution of hydraulic conductivity in the surrounding
bedrock volume.
Out of the total measurable length of 1011,54 m in the borehole 380 m
was measured with 2 m packer separation. A total of 190 complete
tests were made. Additionally some tests were made to check the real
depth of the 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 15 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) interpretations were made
immediately after the measurement.
Hydraulic Testing Unit, HTU-system, designed and manufactured by
Fiskars Geoinstruments to a specification of TVO, was used and
operated by the crew of Geopros Ltd.


Keywords: HTU, hydraulic conductivity, constant head test, hydraulic injection test,
Moye, Horner, skin-effect, transient interpretation, stationary flow

Keywords:

HTU; vedenjohtavuus; vakiopainekoe; vesimenekkikoe; Moye; Homer; virtauseromittaus; skin-tekijä; transienttitulkinta; stationäärivirtaus

File(s):

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR2 (pdf) (9.2 MB)


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