缓冲/回填材料-压实高庙子钠基膨润土的胀缩性试验研究  

Experimental Study on Swell-Shrink Characteristics of Compacted Gaomiaozi Bentonite as Buffer/Backfilling Materials for HLW Disposal

作　　者：杨婷[1] 刘晓东[1,2] 朱国平[1] 郑举功[1] 

机构地区：[1]东华理工大学,江西抚州344000 [2]核资源与环境省部共建教育部重点试验室,江西抚州344000

出　　处：《辐射防护》2013年第1期16-20,36,共6页Radiation Protection

基　　金：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

摘　　要：选用内蒙古高庙子钠基膨润土压实试样进行了室内膨胀力、膨胀变形以及收缩变形的实验。结果表明:高庙子膨润土具有高膨胀、低收缩的良好特性。试样的膨胀力随时间呈渐近线趋势增长,随含水量呈线性增长,随干密度呈指数增长;膨胀变形受初始干密度影响较大,收缩变形受初始含水量的影响较大;在高水分和干密度态下,试样膨胀力为0.85～4.64 MPa,无荷膨胀率为24.4%～40.8%,收缩系数为0.19～0.50。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.

关 键 词：高庙子膨润土 胀缩性能 膨胀力 收缩系数 

分 类 号：P579[天文地球—矿物学]