Abstract
Abstract In order to study nuclear waste repositories in rock salt, an in situ test was undertaken in a salt bed in Alsace (France). Three vertical boreholes were drilled in the gallery floor and were heated by electrical probes simulating the waste canisters. This paper deals with the results of the test on the first borehole during one year of monitoring. Two heating levels followed by a cooling period were applied. The experimental probe and many sensors measuring temperature, convergence, extension, inclination and pressure were designed to be capable of functioning normally at a temperature around 350°C. Twenty eight different sensors were placed inside the probe and in the surrounding rock mass according to the scheme. Tilt meters were placed in two directions on the gallery floor; parallel and normal to the gallery axis.
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