摘要
针对核废料缓冲回填材料内蒙古高庙子钠基膨润土GMZ01,采用同步辐射小角X射线散射(SAXS)和液氮吸附法,基于双对数曲线求斜率测定了SAXS分形维数,基于FHH(Frenkel-Halsey-Hill)模型计算了液氮吸附分形维数。归纳了膨润土膨胀变形计算模型和所需计算参数。基于膨润土膨胀变形双电层和分形模型,采用SAXS分形维数和液氮吸附分形维数分别计算了膨润土膨胀力参数K值,对比了两种方法所测分形维数的计算膨胀力的迥异。结果表明:同步辐射小角散射(SAXS)和液氮吸附所测分形维数较为接近,分别是2.600和2.636,两者差值较小。在双对数坐标表下散射强度和散射矢量存在良好的线性关系;在孔隙比和膨胀力关系中,两种方法所得预测值小于试验实测值;相同的膨润土密度条件下,由SAXS分维计算膨胀应变预测值大于由液氮吸附测试的分维所预测的值。
The fractal dimension is determined based on the slope of the double logarithmic curve using synchrotron radiation small angle X-ray scattering(SAXS)and liquid nitrogen adsorption for sodium-based bentonite in Gaomiaozi,Inner Mongolia,as a backfill material for nuclear waste buffering.Based on the FHH(Frenkel-Halsey-Hill)model,the fractal dimension of liquid nitrogen adsorption was calculated.The calculation of bentonite expansion deformation and the required parameters are summarized.Based on the electric double layer model and fractal model of bentonite expansion deformation,the K value of the expansion force parameter of bentonite was calculated by SAXS fractal dimension and liquid nitrogen adsorption fractal dimension.The difference of the calculated expansion force of the fractal dimension measured by the two methods was compared.The results show that the fractal dimensions measured by SAXS and liquid nitrogen adsorption are close,which are 2.600 and 2.636 respectively,and the difference between the two is small.There is a good linear relationship between scattering intensity and scattering vector in the double logarithmic relationship.In the correlation between void ratio and expansion force,the predicted values obtained by the two methods are smaller than the experimental measured values.Under the same bentonite density,the fractal dimension is calculated by SAXS.The predicted value of the expansion strain is greater than the value predicted by the fractal dimension from the liquid nitrogen adsorption test.
作者
彭磊
陈兵
PENG Lei;CHEN Bing(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第8期2712-2721,共10页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51972209)。
关键词
同步辐射
X射线小角散射
高庙子膨润土
液氮吸附
膨胀力
synchrotron radiation
small angle X-ray scattering
Gaomiaozi bentonite
liquid nitrogen adsorption
expansion force
作者简介
第一作者:彭磊,男,1992年生,博士研究生,主要从事环境岩土工程和非饱和土力学方面的相关研究,E-mail:ptmgc168@sjtu.edu.cn;通讯作者:陈兵,男,1973年生,博士,教授,主要从事混凝土材料方面的相关研究。E-mail:hntchen@sjtu.edu.cn。
