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首页> 外文期刊>Journal of Contaminant Hydrology >Investigation on gas permeability of compacted GMZ bentonite with consideration of variations in liquid saturation, dry density and confining pressure
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Investigation on gas permeability of compacted GMZ bentonite with consideration of variations in liquid saturation, dry density and confining pressure

机译：考虑液体饱和度，干密度和围压变化的压实GMZ膨润土透气性研究

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摘要

During the long term operation of a disposal repository, gas will be inevitably generated. Determination of gas permeability of compacted bentonite is of great importance for the safety assessment of the engineered barrier system. In the present work, the steady-state and residual pressure methods were employed to determine the gas permeability of GaoMiaoZi (GMZ) bentonite with consideration of variations in liquid saturation, dry density and confining pressure. Results show that, gas migration in saturated GMZ bentonite was mainly controlled by diffusion with an effective gas permeability of 1E-23 m(2) - 1E-25 m(2). While in unsaturated GMZ bentonite, significant gas flow rates could be observed, which increased stably with the increase of gas injection pressure. Klinkenberg effect was significant when gas flow through GMZ bentonite. The Klinkenberg corrected gas permeability decreased by 3.5-5.5 orders of magnitude as the liquid saturation increased from 10% to 70%. A decreasing magnitude of 1-2 orders in Klinkenberg corrected gas permeability was presented with the dry density increased from 1.5 Mg/m(3) and 1.7 Mg/m(3). The Klinkenberg corrected gas permeability decreased by 0-1 orders of magnitude as the confining pressure increased from 3 MPa to 7 MPa. By using the accessible porosity, gas measured intrinsic permeability could be determined with values ranged between 1E-15 m(2) to 4E-15 m(2), which was higher than the water measured one by 5 orders of magnitude. Additionally, a generalized power law was successfully adopted in this study to describe the evolution of gas relative permeability with the liquid saturation. Overall, the effective gas permeability, Klinkenberg corrected gas permeability, intrinsic and relative permeability determined in this study provided a comprehensive perspective to assess the buffering property of GMZ bentonite in multi-physical field coupling environment. The parameters obtained can be adopted in further simulation works for long-term safety analysis of the disposal repository from the viewpoint of gas migration.
机译：在处置库的长期运行中，不可避免地会产生气体。压实膨润土的气体渗透性的确定对于工程屏障系统的安全评估非常重要。在目前的工作中，考虑到液体饱和度，干密度和围压的变化，采用稳态和残余压力方法确定高庙子（GMZ）膨润土的透气度。结果表明，饱和GMZ膨润土中的气体迁移主要受扩散控制，有效气体渗透率为1E-23 m（2）-1E-25 m（2）。在不饱和GMZ膨润土中，可以观察到明显的气体流速，随着气体注入压力的增加，气体流速稳定增加。当气体流过GMZ膨润土时，克林根贝格效应非常明显。随着液体饱和度从10％增加到70％，克林肯伯格校正的气体渗透率降低了3.5-5.5个数量级。 Klinkenberg校正的气体渗透率下降了1-2个数量级，干密度从1.5 Mg / m（3）和1.7 Mg / m（3）增加。随着围压从3 MPa增加到7 MPa，克林肯伯格校正的气体渗透率降低了0-1个数量级。通过使用可达到的孔隙率，可以确定气体测得的固有渗透率，其范围介于1E-15 m（2）至4E-15 m（2）之间，该值比水测得的值高五个数量级。此外，这项研究成功地采用了广义幂律来描述气体相对渗透率随液体饱和度的变化。总体而言，本研究确定的有效气体渗透率，克林肯伯格校正的气体渗透率，本征和相对渗透率为评估GMZ膨润土在多物理场耦合环境中的缓冲性能提供了全面的视角。从气体迁移的角度来看，所获得的参数可用于进一步的模拟工作中，以对处置库进行长期安全性分析。

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  • 来源
    《Journal of Contaminant Hydrology》 |2020年第3期|103622.1-103622.12|共12页
  • 作者

  • 作者单位

    Tongji Univ Coll Civil Engn Dept Geotech Engn Shanghai 200092 Peoples R China;

    Tongji Univ Coll Civil Engn Dept Geotech Engn Shanghai 200092 Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China;

    Tongji Univ Coll Civil Engn Dept Geotech Engn Shanghai 200092 Peoples R China|Ecole Ponts ParisTech Lab Navier Paris France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas permeability; GMZ bentonite; Diffusion; Klinkenberg effect; Intrinsic permeability;

    机译：透气性GMZ膨润土;扩散;克林根贝格效应;固有渗透率;

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