Liu Zhanlei, Shi Jianyong, Lin Hai, Zhang Yuchen
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China.
School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China.
Polymers (Basel). 2023 May 29;15(11):2497. doi: 10.3390/polym15112497.
This paper aims to investigate the interfacial strength characteristics, particularly the residual strength, of a high-density polyethylene smooth geomembrane (GMB-S)/nonwoven geotextile (NW GTX) interface using a novel ring shear apparatus under high normal stresses and two specimen conditions. A total of eight normal stresses (from 50 kPa to 2308 kPa) and two specimen conditions (dry and submerged at ambient temperature) are considered in this study. The reliability of using the novel ring shear apparatus to study the strength characteristics of the GMB-S/NW GTX interface was demonstrated by conducting a series of direct shear experiments with a maximum shear displacement of 40 mm and ring shear experiments with a shear displacement of 10 m. The peak strength, post-peak strength development, and residual strength determination method of the GMB-S/NW GTX interface are explained. Three exponential equations suitable for characterizing the relationship between the post-peak friction angle and the residual friction angle of the GMB-S/NW GTX interface are established. This relationship can be used with the relevant apparatus (i.e., an apparatus with deficiencies in executing large shear displacement) in determining the residual friction angle of the high-density polyethylene smooth geomembrane/nonwoven geotextile interface.
本文旨在利用一种新型环剪仪，在高法向应力和两种试样条件下，研究高密度聚乙烯光滑土工膜（GMB-S）/非织造土工织物（NW GTX）界面的界面强度特性，特别是残余强度。本研究共考虑了八个法向应力（从50 kPa到2308 kPa）和两种试样条件（常温下干燥和浸没）。通过进行一系列最大剪切位移为40 mm的直剪试验和剪切位移为10 m的环剪试验，证明了使用新型环剪仪研究GMB-S/NW GTX界面强度特性的可靠性。阐述了GMB-S/NW GTX界面的峰值强度、峰值后强度发展及残余强度测定方法。建立了三个适用于表征GMB-S/NW GTX界面峰值后摩擦角与残余摩擦角关系的指数方程。该关系可与相关仪器（即执行大剪切位移存在缺陷的仪器）一起用于确定高密度聚乙烯光滑土工膜/非织造土工织物界面的残余摩擦角。
