Laboratory Investigation of the Effects of Temperature and Moisture on Interface Shear Strength of Textured Geomembrane and Geosynthetic Clay Liner

Modified stress and temperature-controlled direct shear apparatus on soil-geosynthetics interfaces

“…With regard to the decrease in the magnitude of variation between the shear stress at failure for the room temperature and at elevated temperature due to the increase in normal stress. This can be attributed to, in elevated temperature, the softening drainage core has greater flow (Chrysovergis, 2012), with an increase in the contact area between soil and GDL, enhancing the skin friction resistance, but the rising in shear strength caused by augmenting contact area is lower than the reduction in strength resulted from weakening interlocking effects between soil and GDL, thus, overall, the peak shear strength of the Clay-GDL interfaces decreases with the rise in temperature. Under high normal stress, the increasing magnitude in the contact area with the rise of temperature is higher than that under low normal stress because the drainage core has larger compressive force driving the deformation, which results in the rise in peak shear strength caused by the augmenting contact area under high normal stress being larger than that under low normal stress.…”