Abstract
The installation process may cause unwanted changes in the mechanical behaviour of the geosynthetics. In this work, some geosynthetics used in the base liner system of landfills (a combination of a geotextile, a geomembrane and a geosynthetic clay liner) were submitted to mechanical damage under repeated loading tests (procedure adapted from EN ISO 10722), being monitored the changes occurred in their short-term behaviour. The mechanical damage under repeated loading tests consisted in placing the geosynthetics between a flexible base (granite residual soil with a relative density of 80%) and an aggregate and submitting them to cyclic dynamic loading. The geosynthetics were damaged with a natural aggregate (gravel 14/20), a recycled ceramic aggregate and corundum (synthetic aggregate used in EN ISO 10722). The damage suffered by the geosynthetics was evaluated by monitoring changes in their tensile, tearing (only for the geomembrane) and static puncture properties.
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References
EN ISO 10722 (2007) Geosynthetics – Index test procedure for the evaluation of mechanical damage under repeated loading. Damage caused by granular material
EN ISO 9862 (2005) Geosynthetics – Sampling and preparation of test specimens
Lopes MP, Lopes ML (2003) Equipment to carry out laboratory damage during installation tests on geosynthetics. Geotech J Port Geotech Soc 98:7–24 (in Portuguese)
ASTM D638 (2014) Standard test method for tensile properties of plastics
EN ISO 10319 (2008) Geosynthetics – Wide-width tensile test
ASTM D1004 (2013) Standard test method for tear resistance (graves tear) of plastic film and sheeting
EN ISO 12236 (2006) Geosynthetics – Static puncture test (CBR test)
Acknowledgements
This work was financially supported by projects POCI-01-0145-FEDER-028862 and POCI-01-0145-FEDER-007457, funded by FEDER funds through COMPETE 2020 – “Programa Operacional Competitividade e Internacionalização” (POCI) and by national funds (PIDDAC) through FCT/MCTES. J.R. Carneiro would like to thank FCT for the research grant SFRH/BPD/88730/2012 (grant supported by POPH/POCH/FSE funding).
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Carneiro, J.R., Brás, A.C., de Lurdes Lopes, M. (2019). Mechanical Damage of Geosynthetics Used in the Base Liner System of Landfills Caused by Different Aggregates. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2224-2_86
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DOI: https://doi.org/10.1007/978-981-13-2224-2_86
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