Thermomechanical in-situ heating experiments for the measurement of critical stresses. Final report. Text part, attachments vol. 1-2, contract work reports

A safety evaluation of thermomechanical processes resulting from heat produced by radioactive waste stored in bore-holes requires large-scale in-situ examinations to be made for data acquisition, which then can be taken as the basis for assessment of the complex interactions between the salt rock and the radioactive heat sources in the bore-holes. The evaluation of the data obtained by the mono-heater experiments has shown that further data are required for analysis of the thermomechanical processes in the rock formation, and that these have to be measured by multi-heater experiments. Thus the projects KWA 5204 8 and KWA 5205 9 are continued by the project under review, KWA 5203 9. This project is divided into two project parts relating to the analysis of rock mechanics or geophysics, both with the following, common tasks: to establish a database of rock-mechanical and geophysical data, to be measured in the salt rock by multi-heater experiments; to evaluate the measured data, also using FE calculations, for description of the processes induced by heating; to verify the FE-calculated models by comparison with the in-situ measurements; and to derive conclusions from these analyses relating to the conditions governing the final storage and isolation of heat-producing waste in a salt rock formation. (orig.)