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Andra is in charge of studying the feasibility of a disposal facility for  longlived high-level nuclear waste (LL-HLW) in a deep geological environment.  With this aim, dedicated experiments have been carried out for several years at  the Meuse/Haute Marne Underground Research Laboratory excavated in a 500 m deep  argillaceous rock formation. These experiments include determining the  feasibility of the excavation of disposal cells for LL-HLW, consisting of 40  meter long, 70 cm in diameter, horizontal cased micro tunnels. The hydro  mechanical impact of the excavation of such openings on the rock mass behaviour  is continuously monitored as well as their mean term mechanical behaviour. Since  LL-HLW produce heat, the impact of temperature on the surrounding rock mass and  on the micro tunnel steel casing will also be studied. Specific instrumentation  has been developed to study this impact. The first step of the microtunnel  excavation tests, carried out in 2009, has led to improving the excavation  method and the drilling machine. These improvements will be tested in the next  step of the excavation tests planned for 2010. The THM experiment dedicated to  studying the behaviour of the rock mass under thermal solicitation started early  2010. The behaviour of a steel casing in contact with the rock mass and under  thermal solicitation will be studied in an experiment scheduled to start in  September 2010

In-situ experiments for the determination of rock properties and behaviour at the Meuse/Haute Marne Centre