By Chin-Fu Tsang
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Let the shear stress in the rock mass be increased until a limiting state of stress exists at A. The unloading modulus at this point has a flatter slope than the reduced Griffith modulus, so that the fracture growth would be unstable and the applied load would move along the unloading modulus until the shear resistance of the fracture equals the applied shear stress at point B. In fact the energy supplied by the system as it unloads is greater than that absorbed by the fracture as it evolves from A to B in the amount shown by the area ABC, so that the fracture would shoot past the Average Shear Displacement Figure 8.
Experience and in situ testing are seen to be of the greatest importance in identifying and understanding coupled phenomenon in geomechanics. Coupled Processes Associated with Nuclear Waste Repositories 39 Copyright © 1987 by Academic Press, Inc. All rights of reproduction in any form reserved. 40 Overviews of Coupled Processes INTRODUCTION The overall geomechanical requirements for a waste repository are to ensure safety during repository excavation, waste emplacement and backfilling, and to obviate disturbances to the rock mass that could result in the release of radioactive material to the accessible environment after closure.
In this particular experiment, the rock mass in which the canister hole was drilled was heated also by a ring of peripheral heaters to simulate the thermal field in an actual repository that would result from adjacent canisters of waste. The phenomenon of wellbore breakouts has attracted considerable attention recently as a method for determining stresses in rock at depth. Gough and Bell (1981, 1982) have analyzed breakouts in terms of elastic stress distributions and a Mohr Coulomb failure criterion.
Coupled Processes Associated with Nuclear Waste Repositories by Chin-Fu Tsang