Community Research and Development Information Service - CORDIS

FP5

Ventilation Experiment in Opalinus Clay for the disposal of radioactive waste in underground repositories, Final Report

Project ID: FIKW-CT-2001-00126
Funded under: FP5-EAECTP C

Abstract

The ventilation of the underground drifts during the construction and operation of a radioactive waste repository could produce the partial desaturation of the rock around the drifts, modifying its thermohydro-mechanical properties, specially in clayey rocks. This change of rock properties may have an impact on the design of the repositories (drifts spacing and repository size), which depends on the thermal load that the clay barrier and the rock can accept.
To evaluate "in situ" and better understand the desaturation process of a hard clay formation, the Ventilation Experiment (VE) has been carried out at the Mont Terri underground laboratory (Switzerland), generating a flow of dry air during several months along a section of a microtunnel. Specifically, the VE test has been performed, under practically isothermal conditions (T ~ 15 - 16ºC), in a 10 m long section of a non-lined horizontal microtunnel (diameter = 1,3 m), excavated in 1999 in the shaly facies of the Opalinus Clay of Mont Terri. The microtunnel is oriented perpendicular to the bedding strike direction of the rock (mean value of the bedding dip ~ 25º).

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Record Number: 7181 / Last updated on: 2006-07-13
Category: MISC