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《Radiation Protection》 2013-01
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Experimental Study on Swell-Shrink Characteristics of Compacted Gaomiaozi Bentonite as Buffer/Backfilling Materials for HLW Disposal

Yang Ting1,Liu Xiaodong1,2,Zhu Guoping1,Zheng Jugong1 (1.East China Institute of Technology,Jiangxi Fuzhou 344000; 2.Key Laboratory of Nuclear Reasources and Environment of Ministry of Education,Jiangxi Fuzhou 344000)  
In the HLW deep geological disposal,buffer/backfill materials act as engineering,hydraulic and chemical barrier,which transmit and propagate the heat generated by radioactive waste in the deep geological repository.Gaomiaozi(GMZ) bentonite has been chosen as the first choice for buffer/backfill materials in HLW deep disposal in China.The swelling pressure,swelling and shrinking deformation property of the compacted(GMZ) bentonite are studied in this paper.The results show a property of high swelling and low shrink of(GMZ) bentonite whose swelling pressure increases asymptotically with time linearly with water content and an exponentially with dry density.The swelling property is influenced mainly by initial dry density,and the shrinking property is influenced mainly by initial water content.On the condition of the high water content and dry density,swelling pressure is about 0.85—4.64 MPa,unloaded swelling ratio and shrinkage coefficient are around 24.4%—40.8% and 0.19—0.50 respectively.
【Fund】: 国防科工委基础研究项目(A3420061167)资助;; 2010年度东华理工大学校长基金资助
【CateGory Index】: P579
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