Research on bentonite’s microstructure in GCLs after hydration

XU Chao; LI Zhi-bin; HUANG Liang

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Research on bentonite’s microstructure in GCLs after hydration

更新时间：2026-06-25

- Research on bentonite’s microstructure in GCLs after hydration
- Vol. 27, Issue S2, (2006)
- 作者机构：
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  CLC： TU452
- Online First：16 December 2006，
  
  Published：2006
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XU Chao, LI Zhi-bin, HUANG Liang. Research on bentonite’s microstructure in GCLs after hydration[J]. 2006, 27(S2).
DOI：

XU Chao, LI Zhi-bin, HUANG Liang. Research on bentonite’s microstructure in GCLs after hydration[J]. 2006, 27(S2). DOI：

摘要

近年来土工织物膨润土垫（GCL）被越来越多地应用到各种防渗工程之中，而水化后GCL中膨润土的微观结构会对GCL的长期防渗性能和力学性能产生影响。采用压汞试验，对水化后GCL中膨润土的微观结构进行定量分析，研究了液体对微观结构的影响，并通过化学分析来揭示液体产生影响的机制。结果表明，(1) 采用垃圾渗滤液水化后的膨润土孔隙体积密度最大，大孔径孔隙所占比例最高；(2) 出现上述规律的原因可以归结为两个方面，一是由于渗滤液中阳离子浓度最高而使得蒙脱石表面双电层厚度最小，二是更加频繁的离子交换作用使得蒙脱石表面大直径离子比例最高。

Abstract

Recently

geosynthetic clay liners (GCL) have been more and more used in different anti-seepage engineering projects; and bentonite’s microstructure in GCLs after hydration has great influences on its long-term hydraulic properties and mechanical characteristics. Based on quantitative analysis of bentonite’s microstructure in GCLs after hydration

the influence of liquids is discussed and the mechanism of the influence is revealed by chemical analysis of liquids. The results show that: ①when the hydration liquid is landfill leachate

the pore volume density of bentonite is the biggest

and the ratio of large pores is the highest; ②the reasons of the above rule lie in two aspects. On one hand

thickness of montmorillonite surface double-layer is the smallest because of high cation concentration in landfill leachate. On the other hand

the ratio of large cations on montmorillonite surface is the highest because of more frequent cation exchange.

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