An investigation of field performance of geomembrane-geosynthetic clay liner landfill bottom lining systems
An investigation of field performance of geomembrane-geosynthetic clay liner landfill bottom lining systems
Significant research has been performed on assessing the leakage rate through GM-GCL and US Subtitle D composite lining systems using analytical solutions and empirical equations. The main objectives of this research were to assess the field performance of a GM-GCL landfill bottom lining system, to analyse its performance against the existing leakage estimation equations, and to provide probable causes of the disparities between the calculated and observed leakage rates. The field leakage data from two landfill cells, lined with a double liner system consisting of a primary GM-GCL composite, a leak detection system (LDS), and GM-GCL secondary liner system, were found to be relatively high as compared to those obtained from leakage equations reported in literature. An analysis of the probable causes of the relatively high field leakage rate from the GM-GCL lining system included (1) the possible effects of leachate chemistry on the hydraulic conductivity of the GCL, and (2) groundwater seepage into the LDS from below. The investigation suggests that the excessive observed leakage rate was likely caused by groundwater intrusion into the LDS.
L. Okine; P. Zhang; T. Abichou; J. Chen
9th International Congress on Environmental Geotechnics (ICEG2023)
Geosynthetics for the Geoenvironment
https://doi.org/10.53243/ICEG2023-279
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