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Extra info for FLAC and numerical modeling in geomechanics : proceedings of the third International FLAC Symposium, 21-24 October 2003, Sudbury, Ontario, Canada

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95–103. Balkema. Rotterdam. Shah, S. 1992. A study of the behaviour of jointed rock masses. Ph. D. thesis, Dept. Civil Engineering, University of Toronto. 4) For the case of non-associated flow rule (with dilation angle equal to zero) the solution for the radial stress field is computed from integration of the following second-order differential equation, APPENDIX A. 5) The solution presented in thisAppendix is based on a scaled solution for cylindrical tunnels in Hoek-Brown media discussed in Carranza-Torres and Fairhurst (1999).

A progressive damage of the rock structure in time. Some creep tests and UCS tests have been done by Schmidtke & Lajtai (1985) showing that this granite presents an apparent “viscous” behavior. This phenomenon corresponds to a decrease in the strength in accordance with the loading rate. 0075 MPa/s. At this low loading rate, the measured strength is about 150 MPa. This does not seem enough to justify the field failure, however, we have to be conscious that field loading rates are much lower than those applied in laboratory conditions.

Comparison of convergence analysis. Figure 9. Mesh used in the circular shape. Figure 12. Geometry of the tunnel in the axisymmetric calculation.

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