Abstract
Because the normal stress applied to landfill liner systems increases with the volume of waste during the construction of engineered landfills, traditional shear tests do not adequately describe the loading process on the liner system because only one shear test is performed on a single sample. In this study, a series of laboratory tests using a new test method that differs from traditional shear tests were performed to investigate the repeated shear behaviors of geotextile/geomembrane (GT/GM) and geomembrane/clay (GM/clay) interfaces under various normal stresses. The test results indicated that increasing shearing times decrease the peak and residual shear strengths of both GT/GM and GM/clay interfaces. Additionally, the strength parameters obtained from traditional and repeated shear tests were both used to analyze global stability along the liner system of a typical landfill. The results of repeated shear tests and limit equilibrium analysis were determined to be significant for landfill liner system anti-slide design. The limitations of the tests were also discussed.
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Abbreviations
- FS:
-
Factor of safety
- GM:
-
Geomembrane
- GT:
-
Geotextile
- HDPE:
-
High density polyethylene
- LE:
-
Limit equilibrium
- MSW:
-
Municipal solid waste
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Acknowledgments
Much of the work described in this paper was supported by the National Natural Science Foundation of China under Grant Nos. 41172245 and 41222021, the National Basic Research Program of China (973 Program) under Grant No. 2012CB719803, the Program for New Century Excellent Talents in University under Grant No. NCET-13-0421, the Fundamental Research Funds for the Central Universities, and the Opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) under Grant No. SKLGP2013K005. The writers would like to greatly acknowledge all these financial supports and express the most sincere gratitude.
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Feng, SJ., Lu, SF. Repeated shear behaviors of geotextile/geomembrane and geomembrane/clay interfaces. Environ Earth Sci 75, 273 (2016). https://doi.org/10.1007/s12665-015-4994-2
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DOI: https://doi.org/10.1007/s12665-015-4994-2