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Geometrical and mechanical properties of the fractures and brittle deformation zones based on ONKALO tunnel mapping, 0-2400 m tunnel chainage

Technical Report:

Abstract

In this report, the rock mechanics parameters of fractures and brittle deformation zones in the vicinity of the ONKALO area have been estimated, the analysed data being from the ONKALO tunnel over the chainage range 0-2400 m. Some analysis has also been made based on core logging data from the drillholes OL-KR1-OL-KR40. At this stage, the main objective of the work is to obtain preliminary parameters for the rock mechanics simulations and the rock mechanics design. In this report, the rock mechanics parameters of the fractures are mainly associated with the rock engineering classification quality index, Q, which incorporates the RQD, Jn, Jr and Ja values. The friction angle of the fracture surfaces is estimated from the Jr and Ja numbers. The fracture wall compressive strength (JCS) has been systematically estimated for the chainage range 1280-2400 m using Schmidt hammer tests. So far, only a few laboratory direct shear tests have been conducted on fracture samples. Estimation of the mechanics properties of the brittle deformation zones (BDZ) is based on the mapped Q value, which is transformed to the GSI value in order to estimate strength and deformability properties. A component of the mapped Q values is from the ONKALO  More>>
Authors:
Kuula, H [1] 
  1. WSP Finland Oy, Helsinki (Finland)
Publication Date:
Sep 15, 2010
Product Type:
Technical Report
Report Number:
POSIVA-WR-10-64
Resource Relation:
Other Information: 13 refs.
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; FINLAND; RADIOACTIVE WASTE DISPOSAL; UNDERGROUND DISPOSAL; ROCK MECHANICS; TUNNELS; GEOLOGIC FRACTURES; DEFORMATION; ROCKS; ZONES; BOREHOLES
OSTI ID:
1010738
Research Organizations:
Posiva Oy, Helsinki (Finland)
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
TRN: FI1104012
Availability:
Available in fulltext at http://www.posiva.fi/files/1408/WR_2010-64_web.pdf or as a soft back edition from Posiva Oy, Olkiluoto, 27160 Eurajoki, Finland, tel. +358-2-837231
Submitting Site:
FIN
Size:
76 p. pages
Announcement Date:
Apr 11, 2011

Technical Report:

Citation Formats

Kuula, H. Geometrical and mechanical properties of the fractures and brittle deformation zones based on ONKALO tunnel mapping, 0-2400 m tunnel chainage. Finland: N. p., 2010. Web.
Kuula, H. Geometrical and mechanical properties of the fractures and brittle deformation zones based on ONKALO tunnel mapping, 0-2400 m tunnel chainage. Finland.
Kuula, H. 2010. "Geometrical and mechanical properties of the fractures and brittle deformation zones based on ONKALO tunnel mapping, 0-2400 m tunnel chainage." Finland.
@misc{etde_1010738,
title = {Geometrical and mechanical properties of the fractures and brittle deformation zones based on ONKALO tunnel mapping, 0-2400 m tunnel chainage}
author = {Kuula, H}
abstractNote = {In this report, the rock mechanics parameters of fractures and brittle deformation zones in the vicinity of the ONKALO area have been estimated, the analysed data being from the ONKALO tunnel over the chainage range 0-2400 m. Some analysis has also been made based on core logging data from the drillholes OL-KR1-OL-KR40. At this stage, the main objective of the work is to obtain preliminary parameters for the rock mechanics simulations and the rock mechanics design. In this report, the rock mechanics parameters of the fractures are mainly associated with the rock engineering classification quality index, Q, which incorporates the RQD, Jn, Jr and Ja values. The friction angle of the fracture surfaces is estimated from the Jr and Ja numbers. The fracture wall compressive strength (JCS) has been systematically estimated for the chainage range 1280-2400 m using Schmidt hammer tests. So far, only a few laboratory direct shear tests have been conducted on fracture samples. Estimation of the mechanics properties of the brittle deformation zones (BDZ) is based on the mapped Q value, which is transformed to the GSI value in order to estimate strength and deformability properties. A component of the mapped Q values is from the ONKALO and another component is from the drill cores. The intact rock strength of the brittle deformation zones has been evaluated using Schmidt hammer tests. (orig.)}
place = {Finland}
year = {2010}
month = {Sep}
}