岩土力学 ›› 2020, Vol. 41 ›› Issue (8): 2712-2721.doi: 10.16285/j.rsm.2019.1455

• 基础理论与实验研究 • 上一篇    下一篇

基于同步辐射小角X射线散射和液氮吸附 所测分维计算高庙子膨润土膨胀变形

彭磊,陈兵   

  1. 上海交通大学 船舶海洋与建筑工程学院,上海 200240
  • 收稿日期:2019-08-23 修回日期:2019-12-04 出版日期:2020-08-14 发布日期:2020-10-18
  • 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 E-mail:ptmgc168@sjtu.edu.cn
  • 作者简介: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
  • 基金资助:
    国家自然科学基金(No. 51972209)

Calculation of swelling deformation of Gaomiaozi bentonite based on fractal dimension measured by synchrotron radiation SAXS and liquid nitrogen adsorption

PENG Lei, CHEN Bing   

  1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
  • Received:2019-08-23 Revised:2019-12-04 Online:2020-08-14 Published:2020-10-18
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51972209).

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。

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

Abstract: 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.

Key words: synchrotron radiation, small angle X-ray scattering, Gaomiaozi bentonite, liquid nitrogen adsorption, expansion force

中图分类号: 

  • TU 433
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