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Workreport 1997-11

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Name:

Syväkairaus HH-KR2 Loviisan Hästholmenilla vuonna 1997

Writer:

Risto Niinimäki

Language:

Finnish

Page count:

201

Summary:

Working report: CORE DRILLING OF DEEP BOREHOLE HH-KR2 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

Hästholmen in Loviisa was one of the four sites selected for detailed site
investigations. The detailed site investigations will be carried out during years
1993...2000

As a part of the investigation programme Suomen Malmi Oy (Smoy) coredrilled
a 1005,48 m deep borehole with a diameter of 56 mm in April-May 1997 at
Hästholmen. The identification number of the borehole is HH-KR2.

A set of control measurements and sampletaking of the flush water were
carried out during the drilling. Both the volume and the conductivity of the flush
water and the return water were recorded as well as the pressure of the flush
water. The objective of these measurements was to obtain more information
from the bedrock and groundwater.

Uranine was used as a label in the flush water. The volume of the used flush
water was about 298 m³ and the volume of the return water was about 90 m³.
At the end of the work the borehole was flushed by pumping water about 44,5
m³ from the bottom of the borehole. The deviation of the borehole was
measured with the deviation instruments Reflex Maxibor and Boremac D2. The
results of the Maxibor measurement indicate that the borehole deviates 47,67
m to the right and 63,29 m up in the depth of 993 m.

Core samples were photographed and they were reported by a geologist at the
site. Uniaxial compressive strength, Young`s modulus and the Poisson`s ratio
were measured from core samples. Most of the rock is unweathered, there is
weathered rock at some broken zones and beside joints. The main rock types
are rapakivigranites, pyterlite and homogenous granite. Most of the fractures
are open or tight. The average fracture frequence is over 3,2 pcs/m. The
borehole penetrated 50 pcs of broken zones.

Keywords: coredrilling, borehole, fracture, rapakivigranite, control
measurements, elastic parameters, deviation measurements
CORE DRILLING OF DEEP BOREHOLE HH-KR2 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

Hästholmen in Loviisa was one of the four sites selected for detailed site
investigations. The detailed site investigations will be carried out during years
1993...2000

As a part of the investigation programme Suomen Malmi Oy (Smoy) coredrilled
a 1005,48 m deep borehole with a diameter of 56 mm in April-May 1997 at
Hästholmen. The identification number of the borehole is HH-KR2.

A set of control measurements and sampletaking of the flush water were
carried out during the drilling. Both the volume and the conductivity of the flush
water and the return water were recorded as well as the pressure of the flush
water. The objective of these measurements was to obtain more information
from the bedrock and groundwater.

Uranine was used as a label in the flush water. The volume of the used flush
water was about 298 m³ and the volume of the return water was about 90 m³.
At the end of the work the borehole was flushed by pumping water about 44,5
m³ from the bottom of the borehole. The deviation of the borehole was
measured with the deviation instruments Reflex Maxibor and Boremac D2. The
results of the Maxibor measurement indicate that the borehole deviates 47,67
m to the right and 63,29 m up in the depth of 993 m.

Core samples were photographed and they were reported by a geologist at the
site. Uniaxial compressive strength, Young`s modulus and the Poisson`s ratio
were measured from core samples. Most of the rock is unweathered, there is
weathered rock at some broken zones and beside joints. The main rock types
are rapakivigranites, pyterlite and homogenous granite. Most of the fractures
are open or tight. The average fracture frequence is over 3,2 pcs/m. The
borehole penetrated 50 pcs of broken zones.

Keywords: coredrilling, borehole, fracture, rapakivigranite, control
measurements, elastic parameters, deviation measurements

Keywords:

kairaus; kairanreikä; rako; rapakivigraniitti; tarkkailumittaukset; muodonmuutosominaisuudet; sivusuuntamittaus

File(s):

Syväkairaus HH-KR2 Loviisan Hästholmenilla vuonna 1997 (pdf) (5.6 MB)


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