化学溶液作用下基于压实膨润土孔隙结构演化的土水特征模型研究

贺勇 卢普怀 滕继东 叶为民

贺勇, 卢普怀, 滕继东, 等. 2022. 化学溶液作用下基于压实膨润土孔隙结构演化的土水特征模型研究[J]. 工程地质学报, 30(2): 338-346. doi: 10.13544/j.cnki.jeg.2021-0149
引用本文: 贺勇, 卢普怀, 滕继东, 等. 2022. 化学溶液作用下基于压实膨润土孔隙结构演化的土水特征模型研究[J]. 工程地质学报, 30(2): 338-346. doi: 10.13544/j.cnki.jeg.2021-0149
He Yong, Lu Puhuai, Teng Jidong, et al. 2022. Analysis of pore structure based SWRC predicting models in characterizing chemical effects on SWRC of compacted bentonite[J]. Journal of Engineering Geology, 30(2): 338-346. doi: 10.13544/j.cnki.jeg.2021-0149
Citation: He Yong, Lu Puhuai, Teng Jidong, et al. 2022. Analysis of pore structure based SWRC predicting models in characterizing chemical effects on SWRC of compacted bentonite[J]. Journal of Engineering Geology, 30(2): 338-346. doi: 10.13544/j.cnki.jeg.2021-0149

化学溶液作用下基于压实膨润土孔隙结构演化的土水特征模型研究

doi: 10.13544/j.cnki.jeg.2021-0149
基金项目: 

国家自然科学基金 42072318

国家自然科学基金 42030714

国家自然科学基金 41807253

国家自然科学基金 41972282

湖南省自然科学基金 2019JJ50763

国家重点研发计划项目 2019YFC1803600

国家重点研发计划项目 2019YFC1805900

详细信息
    通讯作者:

    贺勇(1987-),男,博士,副教授,博士生导师,主要从事环境工程地质与非饱和土力学方面研究. E-mail: heyong18@csu.edu.cn

  • 中图分类号: P619.25+5

ANALYSIS OF PORE STRUCTURE BASED SWRC PREDICTING MODELS IN CHARACTERIZING CHEMICAL EFFECTS ON SWRC OF COMPACTED BENTONITE

Funds: 

the National Natural Science Foundation of China 42072318

the National Natural Science Foundation of China 42030714

the National Natural Science Foundation of China 41807253

the National Natural Science Foundation of China 41972282

Natural Science Foundation of Hunan Province 2019JJ50763

the National Key Research and Development Program of China 2019YFC1803600

the National Key Research and Development Program of China 2019YFC1805900

  • 摘要: 在高放废弃物深地质处置库复杂的地下水环境影响下,缓冲/回填材料微观孔隙结构的改变通常会大大影响其水力性质。为探究这种影响,众多学者从不同理论出发,建立了相应的土水特征模型。然而,针对这些模型的对比研究较少,且缺少将模型应用于考虑化学影响的情况。在压实膨润土微观结构分析的基础上,基于分形理论和双孔理论,分别构建了压实膨润土土水特征预测模型,然后基于不同浓度NaCl溶液处理后压实GMZ膨润土的压汞试验数据,用两种模型预测其土水特征曲线,并与实测曲线进行比较。研究结果表明:两种模型均适用于预测化学溶液作用下压实膨润土的土水特征曲线;经历干湿循环使压实膨润土孔径趋于均一,导致其土水特征曲线为单峰形式,试样的持水作用由小孔主导,故相较于双孔持水的实测试样,预测试样在低吸力范围内持水能力较低;与蒸馏水处理后相比,盐溶液导致集聚体间孔隙减少,在相同基质吸力下试样的含水量降低;而在高浓度盐溶液处理后,由于孔隙流体通道增加和压实膨润土内部产生微裂隙,试样在高吸力范围内的持水性略有增强。
  • 图  1  考虑压实膨润土双孔结构的SWRC

    Figure  1.  The double-peak SWRC considering the dual-porosity structure of compacted bentonite

    图  2  膨润土微观结构示意图(修自Nasir et al.(2017))

    Figure  2.  The microstructure of bentonite(modified from Nasir et al.(2017))

    图  3  压实GMZ膨润土(ρd=1.7 Mg ·m-3)的孔径密度曲线(He et al., 2016)

    Figure  3.  The pore size density curve of compacted GMZ bentonite(ρd=1.7 Mg ·m-3)(He et al., 2016)

    图  4  压实GMZ膨润土(ρd=1.7 Mg ·m-3)的累计压汞曲线(He et al., 2016)

    Figure  4.  The pore size cumulative curve of compacted GMZ bentonite(ρd=1.7 Mg ·m-3)(He et al., 2016)

    图  5  基于He et al.(2016)孔径分布数据预测的压实GMZ01膨润土SWRC

    Figure  5.  Predicted SWRCs according to the pore size distribution data from He et al.(2016)

    图  6  预测的SWRC与实测SWRC比较

    Figure  6.  Comparation between the predicted and measured SWRCs

    表  1  分形模型参数

    Table  1.   Parameters of the fractal model

    参数 DWS110 C0.1S110 C1.0S110
    e(试验求得) 0.67838 0.63973 0.62477
    Gs(试验给出) 2.66 2.66 2.66
    β(拟合参数) 0.43768 0.83013 1
    ψAEV(由孔径求得)/MPa-1 2.304 2.326 0.641
    D(拟合参数) 2.84334 2.92321 2.95016
    R2 0.98098 0.98044 0.62477
    下载: 导出CSV

    表  2  双孔模型参数

    Table  2.   Parameters of the dual-porosity model

    参数 DWS110 C0.1S110 C1.0S110
    em(试验求得) 0.65063 0.61198 0.53249
    e(试验求得) 0.67838 0.63973 0.62477
    Gs(试验给出) 2.66 2.66 2.66
    αom(拟合参数)/MPa-1 0.17318 0.14358 0.35903
    αoM(拟合参数)/MPa-1 8.55×1041 4.167×1041 8.053×1042
    nm(拟合参数) 1.25065 1.30729 1.31483
    nM(拟合参数) 1.00325 1.00293 1.00092
    mm(拟合参数) 0.200416 0.235059 0.239445
    mM(拟合参数) 0.003239 0.002921 0.000919
    R2 0.98186 0.98459 0.99516
    下载: 导出CSV
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  • 收稿日期:  2021-03-22
  • 修回日期:  2021-04-28
  • 刊出日期:  2022-04-25

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