Workreport 2009-111
Back
|
Name:
|
Core Drilling of Deep Drillhole OL-KR53 at Olkiluoto in Eurajoki 2009
|
|
Writer:
|
Toropainen, V.
|
|
Language:
|
English
|
|
Page count:
|
114
|
|
Summary:
|
As a part of the confirming site investigations at Olkiluoto, Suomen Malmi Oy (Smoy) core drilled 300.48 m and 45.44 m deep drillholes, OL-KR53 and OL-KR53B, at Olkiluoto in July - August 2009. The diameter of the drillholes is 75.7 mm.
A set of monitoring measurements and samplings from the drilling and returning water was carried out during the drilling. Both the volume and the electric conductivity of the returning and drilling water were recorded. The drill rig was computer controlled and the computer recorded drilling parameters during drilling. The objective of the measurements was to obtain more information about bedrock and groundwater properties. Sodium fluorescein was used as a label agent in the drilling water. The total volumes of the used drilling and washing water were 217 m3 and 24 m3 in the drillholes OL-KR53 and OL-KR53B, respectively. The measured volumes of the returning water in the drillholes were 164 m3 and 20 m3, respectively. The deviations of the drillholes were measured with the deviation measuring instruments EMS and Maxibor II.
Uniaxial compressive strength, Young’s Modulus and Poisson’s ratio were measured from the core samples. The average uniaxial compressive strength was 107.7 MPa, the average Young’s Modulus was 47.0 GPa and the average Poisson’s ratio was 0.29.
The main rock types are diatexitic and veined gneisses and tonalitic-granodioritic-granitic gneiss. The average fracture frequency is 2.6 pcs/m in drillhole OL-KR53 and 2.9 pcs/m in the drillhole OL-KR53B. The average RQD values are 93.9 % and 95.1 %. Ten separate fractured zones were interpreted from OL-KR53 and two fractured zoned from OL-KR53B.
|
|
Keywords:
|
Core drilling, drillhole, veined gneiss, diatexitic gneiss, tonalitic-granodioriticgranitic gneiss, fracture, monitoring measurements, elastic parameters, deviation surveys, Olkiluoto
|
|
File:
|
 Core Drilling of Deep Drillhole OL-KR53 at Olkiluoto in Eurajoki 2009 (pdf) (1.6 MB)
|
Back
|
