Abstract
A geosynthetic liner system that consists of geomembrane (GMB) and geosynthetic clay liner (GCL) is vital for landfill stability analysis and it is essential to investigate the shear characteristics of GMB/GCL interface. This paper introduces a new direct shear apparatus for various geosynthetic interfaces with innovative designing, and using this apparatus 48 shear test sets of four GMB/GCL interface types are conducted under a normal stress level of 100–500 kPa and a shear rate of 0.1–100 mm/min. Effects of the surface roughness of GMB and the hydration condition of GCL on the shear stress–displacement relationship and shear strength of interfaces are investigated. Results show that the evolution of physical phenomena from shear deformation of GCL (denoted as shear phase) to frictional slip between GMB and GCL (denoted as friction phase) occurs at the critical state of peak shear strength where GMB/GCL interfaces provide the largest shear resistance. For GMB/hydrated GCL, shear phase can be further divided into pure shear phase and reinforced shear phase by initial peak strength. Thus, phased shear mechanism of GMB/GCL interface is revealed with explanations on physical and mechanical results. Some future prospects on GMB/GCL interfaces are also proposed.
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Abbreviations
- GCL:
-
Geosynthetic clay liner
- UGCL:
-
Unhydrated geosynthetic clay liner
- HGCL:
-
Hydrated geosynthetic clay liner
- GMB:
-
Geomembrane
- GMBS:
-
Smooth geomembrane
- GMBX:
-
Textured geomembrane
- HDPE:
-
High-density polyethylene
- NP:
-
Needle-punched
- NW:
-
Nonwoven
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Acknowledgements
The authors would like to greatly acknowledge all these financial supports and express the most sincere gratitude.
Funding
This work was supported by the National Natural Science Foundation of China under Grant Nos. 41931289, 41725012 and 42007249, the Shanghai Science and Technology Innovation Action Plan under Grant No. 20DZ1203402 and the China Postdoctoral Science Foundation under Grant No. 2020M671218.
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Shi-Jin Feng contributed to conceptualization, writing—review and editing, and supervision. Yang Shen provided methodology and performed formal analysis and investigation. Qi-Teng Zheng performed formal analysis and investigation and writing—original draft preparation. Jia-Liang Shi provided methodology.
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Feng, SJ., Shen, Y., Zheng, QT. et al. Multi-functional direct shear apparatus for geosynthetic interfaces with its application on various GMB/GCL interfaces. Acta Geotech. 17, 993–1008 (2022). https://doi.org/10.1007/s11440-021-01279-6
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DOI: https://doi.org/10.1007/s11440-021-01279-6