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Workreport 1997-45

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Name:

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR4

Writer:

Heikki Hämäläinen

Language:

Finnish

Page count:

821

Summary:

Working report: HYDRAULIC CONDUCTIVITY MEASUREMENTS AT EURAJOKI, OLKILUOTO,
BOREHOLE OL-KR4

ABSTRACT

As a part of the detailed site investigations hydraulic conductivity measurements
were carried out in borehole KR4 at Olkiluoto in Eurajoki. Olkiluoto is one of the
four 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 861,50 m in the borehole 512 m was
measured with 2 m packer separation. A total of 256 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 sections were, however, stabilised or injected
up to several hours. Two transient (Horner and 1/Q) and one
stationary-state (Moye) interpretations were made immediately after the measu-
rement.
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
HYDRAULIC CONDUCTIVITY MEASUREMENTS AT EURAJOKI, OLKILUOTO,
BOREHOLE OL-KR4

ABSTRACT

As a part of the detailed site investigations hydraulic conductivity measurements
were carried out in borehole KR4 at Olkiluoto in Eurajoki. Olkiluoto is one of the
four 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 861,50 m in the borehole 512 m was
measured with 2 m packer separation. A total of 256 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 sections were, however, stabilised or injected
up to several hours. Two transient (Horner and 1/Q) and one
stationary-state (Moye) interpretations were made immediately after the measu-
rement.
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

Keywords:

HTU; vedenjohtavuus; vakiopainekoe; vesimenekkikoe

File(s):

Vedenjohtavuuden mittaukset Eurajoen Olkiluodossa, kairanreikä OL-KR4 (pdf) (12 MB)


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