POTENTIAL COUPLED CHEMICAL EFFECTS IN A CRYSTALLINE ROCK EDZ
The Excavation Damaged Zone, EDZ, will be exposed to air during the time the drifts and tunnels are open. Oxygen and carbon dioxide from the air will be in contact with the EDZ during decades. Oxygen can react with reducing minerals containing ferrous iron such as biotite and pyrite and generate precipitates of ferric oxyhydroxides in the fractures as well as in the porous rock matrix. In addition these reactions lead to the formation of acid which can react with some rock forming minerals. Carbon dioxide from the air dissolved in pore water can react with rock forming minerals. The increased water flowrate into an open repository can bring up brine from depth by up-coning or freshwater by down-coning from the surface. The change in salinity will induce reactions. Changes in rock stress cause chemical disequilibrium as does the increased temperature caused by the presence of heat emitting radioactive waste. The possible impact of these effects is discussed.
Ivars Neretnieks
Department of Chemical Engineering and Technology,Royal Institute of Technology Stockholm, Sweden
国际会议
南京
英文
638-647
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）