Hydraulic Performance of GCL Seams without Field-Applied Supplemental Bentonite below a Geomembrane Wrinkle

作者：Joshi Prabeen; Brachman Richard W I^*; Rowe R Kerry

来源：Journal of Geotechnical and Geoenvironmental Engineering, 2017, 143(9): 04017068.

DOI：10.1061/(ASCE)GT.1943-5606.0001756

• Geosynthetic clay liner
• Overlapped seams
• Wrinkles
• Leakage
• Heattacking

The hydraulic performance of geosynthetic clay liner (GCL) overlapped seams relying on hydration of panel bentonite through a melted groove in one of its geotextiles to seal the overlap is reported for the situation where the seam is below a wrinkle in an overlying geomembrane. The amount of hydrated bentonite extruded through the groove at the seam depended on whether or not the groove melt was continuous. Flow along a seam having complete groove melt with well-hydrated bentonite was 2-3 times higher than that through a single panel of GCL below a wrinkle, but two orders of magnitude lower than that through a seam with incomplete groove melt. The effect of heat tacking on the hydraulic performance of an overlapped seam is examined. The method of heat tacking, the width of the heat-tacked zone, and its positioning at the seam were found to impact seam flow.

• 出版日期2017-9