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Particle size effects on interface shear behavior and geomembrane wear

机译：粒度对界面剪切行为和土工膜磨损的影响

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Composite systems comprised of particulate and continuum materials in contact at an interface are frequently encountered in geotechnical engineering. An understanding of the shear behavior occurring at this interface is of considerable importance as it governs the behavior of the entire composite system. Previous research in this area has focused on the behavior involving uniformly sized particulate materials. This is despite the fact that particulate mixtures comprised of differing particle sizes and shapes are most frequently encountered in practice. There is a need for a framework whereby the macroscale response of soil mixtures in contact with an interface can be quantitatively predicted from knowledge of the particulate and interface properties. Such a framework would prove useful in selecting the optimal materials for the design of engineered soils and interfaces. This research explores the case of binary mixtures of quartz sands in contact with smooth geomembrane surfaces. Index properties of the binary sand mixtures have been determined for different particle size ratio combinations. The particle size ratio of the binary mixtures ranges from 2.1 to 6.1 and the size of the particles ranges from 0.13mm to 0.78mm. A series of interface shear tests were conducted to determine the macroscale interface shear behavior and resulting geomembrane wear. The effects of mean particle size and particle size ratio were investigated. Changes to the surface topography of the counterface material are quantified using stylus profilometry and related to the characteristics of the sand mixtures.
机译：在岩土工程中经常遇到由封路中接触的颗粒和连续材料组成的复合系统。在该界面发生的剪切行为的理解是重要的重要性，因为它控制了整个复合系统的行为。以前的这一领域的研究专注于涉及均匀尺寸的颗粒材料的行为。尽管在实践中最常遇到由不同粒度和形状组成的颗粒状混合物。需要一种框架，可以从颗粒和界面性质的知识定量预测与界面接触的土壤混合物的宏观响应。这样的框架将证明在选择设计的工程污染和界面的最佳材料方面是有用的。该研究探讨了与光滑地产膜表面接触的石英砂二元混合物的情况。已针对不同的粒度比组合确定二元砂混合物的指数特性。二元混合物的粒度比为2.1至6.1，颗粒的尺寸范围为0.13mm至0.78mm。进行了一系列界面剪切测试以确定宏观界面剪切行为并得到地膜磨损。研究了平均粒径和粒度比的影响。使用触控笔轮廓测量测量和与砂混合物的特性进行量化的对抗面材料的表面形貌的变化。

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