Abstract
Needle-punched geosynthetic clay liner (NPGCL) has been widely used in landfills. The internal strength of the GCL changes with temperature variation, which affects its application in landfills. A large-scale temperature-controlled direct shear apparatus was developed to study the internal shear strength characteristics of GCL affected by temperature. The internal strength of the GCL was dependent on the bentonite, the fibers, and the interaction between the fibers and the bentonite. The influence of temperature on the internal strength of the GCL was mainly reflected in the displacement at peak strength. However, the peak strength was basically unchanged. The strength of the bentonite and the fibers-reinforced bentonite increased when the temperature increased. The tensile strength of needle-punched fibers decreased with increasing temperature. The peak strength displacement of the fibers-reinforced bentonite decreased with increasing temperature.
Highlights
Temperature-controlled direct shear test of bentonite was conducted with the same apparatus in Geosynthetic clay liner (GCL) direct shear test
A large scale temperature-controlled direct shear apparatus was developed to study the characteristics of GCL internal shear strength under the influence of temperature
The internal strength of the GCL was dependent on three parts: the strength of the bentonite, the tensile strength of the needle-punched fibers, and the strength generated by the interaction between the fibers and the bentonite
Summary
Geosynthetic clay liner (GCL) has been widely used in landfill liner structures [1,2]. Research on the shear strength characteristics of GCL was conducted primarily through indoor shear tests to study the product type, hydration, temperature and hydration time, consolidation time, shear rate, shear displacement, the drainage condition of the normal stress, the process of hydration and shear, hydrated solution, and other specific factors of equipment (such as the specimen clamping system) that influence the shear strength characteristics of the GCL alone or with other geosynthetic materials [4,8,22,28,34,35]. The temperaturecontrolled direct shear tests of the GCL, the bentonite, the fibers and the fibers-reinforced bentonite were conducted to study how the mechanism of temperature affected the shear characteristics of the GCL
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