岩土力学Issue(z1)：215-220,6.
Eu（III）溶液对膨润土-砂混合物渗透性能影响研究
Research on effect of Eu(III) solution on the permeability of bentonite-sand mixtures
摘要
Abstract
Radionuclides will transport to the biosphere after the overpack destroyed in the high-level radioactive waste(HLW) disposal repository. The hydraulic conductivity of buffer/backfill material plays an important role in evaluating the properties of the engineering barrier of HLW disposal repository. The permeability characteristics of Gaomiaozi bentonite-sand mixtures are studied by using the flexible wall permeameter and taking 2.0×10-5 mol/L Eu(III) solution as influent. The hydraulic conductivities are measured at K=(2.07-5.23)×10-10 cm/s. Test results show that there is no significant change in hydraulic conductivity of bentonite-sand mixtures, swelling with water, with the sand ratio ranging from 0% to 50%. Therefore, the requirement of low permeability for buffer/backfill material should be met by these mixtures. The effective clay dry density (ECDD) is used in this paper;and a good exponential relationship between volume swelling strain and ECDD and a linear-attenuation relationship between the logarithm value of hydraulic conductivity and ECDD of bentonite-sand mixtures are obtained. Compared with the distilled water, the hydraulic conductivities of bentonite-sand mixtures are smaller when influent is the 2.0×10-5 mol/L Eu(III) solution, which may result from the effect of influent viscosity.关键词
高放废物/Eu(III)溶液/膨润土-砂混合物/水力传导系数/有效黏土密度Key words
high-level radioactive waste (HLW)/Eu(III) solution/bentonite-sand mixtures/hydraulic conductivity/effective clay dry density (ECDD)分类
建筑与水利引用本文复制引用
张虎元,周浪,陈航,闫铭..Eu（III）溶液对膨润土-砂混合物渗透性能影响研究[J].岩土力学,2014,(z1):215-220,6.基金项目
兰州大学中央高校基本科研业务费专项资金资助（No.lzujbky-2013-k03）。 （）
