Estimation of rock mass strength and deformability in 3D for a 30 m cube at a depth of 485 m at Äspö Hard Rock Laboratory
 P. H. S. W. Kulatilake,
 Jinyong Park,
 Jeonggi Um
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The rock fracture data provided by Swedish Nuclear Fuel and Waste Management Company were used to develop a 3D stochastic fracture network model for a 30 m cube of Äspö diorite located at a depth of 485 m at Äspö Hard Rock Laboratory, Sweden. This fracture network model was validated. A new procedure is developed to estimate rock block strength and deformability in threedimensions allowing for the anisotropy and incorporating the inherently statistical fracture geometry for the selected cube. The mean rock mass strength was found to be 47% of the mean intact rock strength of 297 MPa at 485 m depth. The mean rock mass modulus was found to be 51% of the intact rock Young's modulus of 73 GPa. The rock mass Poisson's ratio was found to be 21% higher than the intact rock Poisson's ratio of 0.28. These percentages indicate the level of weakening of the rock mass due to the presence of fractures. The ratio of mean major principal rock mass strength/mean minor principal rock mass strength turned out to be 1.28. The ratio of mean major principal rock mass modulus/mean minor principal rock mass modulus turned out to be 1.21.
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 Title
 Estimation of rock mass strength and deformability in 3D for a 30 m cube at a depth of 485 m at Äspö Hard Rock Laboratory
 Journal

Geotechnical & Geological Engineering
Volume 22, Issue 3 , pp 313330
 Cover Date
 20040901
 DOI
 10.1023/B:GEGE.0000025033.21994.c0
 Print ISSN
 09603182
 Online ISSN
 15731529
 Publisher
 Kluwer Academic Publishers
 Additional Links
 Topics
 Keywords

 anisotropy
 3D numerical modeling
 rock fracture network modeling
 rock mass deformability
 rock mass strength
 underground rock mechanics
 Industry Sectors
 Authors

 P. H. S. W. Kulatilake ^{(1)}
 Jinyong Park ^{(1)}
 Jeonggi Um ^{(1)}
 Author Affiliations

 1. Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ, 85721, USA