Abstract
ABSTRACT: This paper examines the role of geotextile constraint during laboratory testing on geotextile/geomembrane interface shear behavior. This study specifically involved four needle-punched nonwoven geotextiles as well as a smooth and a textured HDPE geomembrane representative of products commonly used in practice. The effects of allowing geotextile strain on geotextile/geomembrane interface performance were quantified through a series of laboratory tests using an interface shear device that can be used to perform tests with geotextiles in both constrained and unconstrained conditions. Testing was conducted over a range of normal stresses between 10 and 400 kPa. Results showed that allowing geotextile strain decreased the peak interface shear resistance against a smooth geomembrane surface by 11% to 25% and by 13% to 33% for quasi-residual interface shear resistance. Decreases in interface shear resistance for unconstrained geotextiles against a moderately textured geomembrane were found to be 19% to 35% and 6% to 23% for peak and quasi-residual states, respectively. A distinct pattern of vertical displacements was observed for various combinations of materials and boundary conditions. This study provides quantitative insight into texture-filament interlocking mechanisms potentially relevant to in situ conditions. Based on the experimental observations, generalized interface shear mechanisms are proposed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.