Research On Expansion Character Of High-level Radioactive Waste RepositoryBuffer And Backfill Material

There are many ways to the disposal of nuclear waste, according to the research of scholars both at home and abroad, the current method of deep geological disposal is regarded as the most realistic way. Bentonite because of its extremely low permeability and excellent properties, such as nuclide adsorption is considered to be the buffer/backfill material for containment to the disposal of underground disposal repository of channels, in order to partition the rolls nuclear waste material of choice for environmental contact with the outside world. Using geotechnical test related test methods, this study on the expansion of the altay, xinjiang bentonite performance conducted a large number of tests, according to the result of test research and analysis the expansion force, expansion ratio, stability, relevant results are obtained:1.The factors affecting sample expansion force maximum is dry density,followed by bentonite content, solution concentration of medium, initial water content,the conclusion is consistent with the similar experimental results at home and abroad;2.Sample of initial moisture content has inhibitory effect on expansion forces play;3.When the sample sand ratio of more than 30%, the expansion of the sample will be lower than 1 mpa, cannot meet the buffer backfill material in expanding the use of performance requirements;4.The selected samples, bentonite, zeolite, pyrite mass ratio of 63: 27:10 set of sample in the expansion of the salt solution under the action of performance is good, and shows a good stability;5.The selected sample, bentonite, quartz sand quality of 9:1 ratio of the sample expansion under the effect of alkali solution stability is good;6.The three experiments, choose formula samples under the action of water and salt solution, alkali solution, no one can in under the action of three kinds of medium solution are showed better performance of inflation.7.All the expansion of the sample process, showed two phases: rapid expansion,close to linear; Inflation slowing down, close to the quadratic curve。...