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Relationship between the shrinkage crack characteristics and the water content gradient of compacted clay liner in a landfill final cover

机译：填埋场最终覆盖层中压实粘土衬砌的收缩裂缝特征与含水量梯度的关系

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摘要

Shrinkage cracking is the primary reason for the anti-seepage failure of compacted clay liner (CCL) in a landfill final cover. With a focus on the surface crack characteristics and the water content distribution of three CCLs with different liquid limits and their mineral compositions, experiments were conducted to investigate the cracking mechanism of a CCL during the drying process. The results showed that the total crack ratio (TCR), the sum of the surface shrinkage crack ratio (SCR) and the surface boundary shrinkage ratio (BSR), is a function of the surface water content of a CCL. The change in the TCR with surface water content is consistent with the soil shrinkage characteristic curve (SSCC). The surface SCR is a function of the surface water content gradient of a CCL. The variations in the SCR with the water content gradient can be divided into the following three stages: the crack open stage, the crack linear expansion stage and the crack linear close stage. The effect of sample size, surface boundary shrinkage and shrinkage cracking are the main deformations of CCL specimens with low and high liquid limits, respectively, during the drying process. An increase in the amount of clay minerals in CCLs enhances the soil shrinkage capacity, leading to an increase in the SCR under the same water content gradient. A unified linear relationship exists between SCR/K-j (where K-j is the slope of the SSCC) and the water content gradient in the crack linear expansion stage and the crack linear close stage for different CCL types. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：收缩开裂是垃圾填埋场最终压实的粘土衬里（CCL）防渗失效的主要原因。针对三种液位不同的覆铜板的表面裂纹特征和含水量分布及其矿物组成，进行了实验研究，探讨了覆铜板在干燥过程中的开裂机理。结果表明，总裂纹率（TCR），表面收缩裂纹率（SCR）和表面边界收缩率（BSR）之和是CCL表面含水量的函数。 TCR随地表含水量的变化与土壤收缩特性曲线（SSCC）一致。表面SCR是CCL的表面水含量梯度的函数。 SCR随水含量梯度的变化可分为以下三个阶段：裂纹开放阶段，裂纹线性膨胀阶段和裂纹线性闭合阶段。样品大小，表面边界收缩和收缩裂纹的影响分别是在干燥过程中低和高液体含量的CCL样品的主要变形。覆铜板中粘土矿物含量的增加增强了土壤的收缩能力，导致在相同含水量梯度下SCR的增加。 SCR / K-j（其中K-j是SSCC的斜率）与不同CCL类型的裂纹线性膨胀阶段和裂纹线性闭合阶段的水含量梯度之间存在统一的线性关系。 （C）2018年由Elsevier B.V.代表日本岩土工程学会制作和托管。

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  • 来源
    《Soils and foundations》 |2018年第6期|1435-1445|共11页
  • 作者

    Wan Yong; Xue Qiang; Liu Lei; Wang ShanYong;

  • 作者单位

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Univ Newcastle, ARC Ctr Excellence Geotech Sci & Engn, Civil Surveying & Environm Engn, Callaghan, NSW 2308, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Landfill; Compacted clay liner; Cracking characteristics; Water content gradient; Permeability; Pore-size distribution;

    机译：垃圾填埋场;压实的粘土衬里;裂缝特性;含水量梯度;渗透率;孔尺寸分布;

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