Technical Session: Mine Covers & Geosynthetics
Abstract
Recent heap leach failures have highlighted composite liner performance as a potential controlling factor on global stability, particularly at the geomembrane–geosynthetic clay liner (GM-GCL) interface. Current design practice relies mainly on interface shear strength data obtained above freezing and does not explicitly consider frozen or freeze–thaw conditions.
This paper presents results from a large direct shear testing program on GM-GCL systems subjected to controlled freezing. Testing at room and sub-zero temperatures evaluates peak and large-displacement, along with displacement behaviour and post-shear interface condition. Supporting index testing of the GCL, subgrade, and geomembrane texture is used to interpret changes in interface response.
The results define temperature-dependent changes in shear strength and post-peak behaviour, assess the adequacy of commonly assumed design parameters, and provide guidance for cold-region liner testing and design.
Authors
- Bryce Marcotte | Senior Geotechnical Engineer
- Betsy Ugolo | University of Saskatchewan
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