Stress-strain analysis of geogrid-supported liners over subsurface cavities |
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Authors: | M A Gabr T J Hunter |
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Institution: | (1) Department of Civil Engineering, West Virginia University, Box 6101, 26505-6101 Morgantown, WV, USA;(2) CH2M Hill, Tampa, Florida, USA |
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Abstract: | Summary Finite element analyses were conducted to investigate the magnitude of tensile strains imposed on landfill liners due to the
formation of subsurface cavities. The study incorporated the significance of using geogrids to reduce the magnitude of strains
and possibly the potential for collapse of landfill liners. Variations of key parameters included depth of overburden (D) and diameter of the cavity (B). Estimated stress distributions were compared to theoretical values obtained from a model reported in the literature.
Results indicated that, contrary to conventional wisdom, the critical area based on the mechanics of arching was above the
edge of the cavity where stress concentration occurred. Incorporation of geogrid reinforcement reduced the magnitude of tensile
strains. The tensile force in the geogrid was dependent upon the size of the cavity, the depth of the overburden, and the
applied pressure. |
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Keywords: | Arching cavity finite element geogrids liners reinforcement soil strain stress |
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