<p>A database of 534 large-scale direct shear test results was assembled in this study to evaluate the interface shear strength between geosynthetic clay liners GCLs and geomembranes GMs . The tests were conducted between 1992 and 2003 by a single independent ...

A torsional ring shear apparatus and test procedure are described for measuring soil - geosynthetic and geosynthetic - geosynthetic interface strengths based also on back analysis of Kettleman Hills Waste Repository in California.