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Influence of particle shape on the shear strength and dilation of sand-woven geotextile interfaces

机译：颗粒形状对砂编织土工织物界面抗剪强度和膨胀的影响

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The influence of particle shape on the mechanical behavior of sand-woven geotextile interfaces over a wide domain of soil density and normal stress is studied. A uniformly graded angular fine sand, and a blend of well rounded glass beads with identical particle size distributions, were selected as granular material. Experiments revealed the impact of particle shape on peak and residual friction angles as well as the maximum dilation angle of interfaces between both granular media and woven geotextile. It was observed that the residual friction angles of interfaces between angular sand/glass-beads and woven geotextile are very similar to the residual friction angles of angular sand and glass-beads in soil-soil direct shear test. It is understood that the peak friction angle and maximum dilation angle of angular sand-woven geotextile were slightly lower than corresponding values for angular sand in soil-soil direct shear test. While the peak friction angle and maximum dilation angle of angular sand-woven geotextile interface decrease with the increase in normal stress, experiments showed that these factors are insensitive to normal stress for glass beads-woven geotextile interfaces, at least for the range studied herein. All interfaces with woven geotextile as the contact surface exhibit an abrupt loss of shear strength in the post-peak regime of behavior. Finally, a unified stress-dilation law for the angular sand-woven geotextile, glass beads-woven geotextile, and angular sand-roughened steel interfaces is obtained. (C) 2016 Elsevier Ltd. All rights reserved.
机译：研究了在大范围的土壤密度和法向应力下，颗粒形状对砂编织土工织物界面力学行为的影响。选择均匀梯度的角细砂和具有相同粒径分布的良好圆形玻璃珠的混合物作为粒状材料。实验揭示了颗粒形状对峰值和残余摩擦角以及颗粒介质与机织土工织物之间界面的最大膨胀角的影响。观察到，在土壤-土壤直接剪切试验中，角砂/玻璃珠与机织土工布之间的界面的残余摩擦角与角砂与玻璃珠的界面的残余摩擦角非常相似。可以理解，在土壤-土壤直接剪切试验中，角砂编织土工布的峰值摩擦角和最大膨胀角略低于角砂的相应值。虽然角砂编织土工织物界面的峰值摩擦角和最大扩张角随法向应力的增加而减小，但实验表明，对于玻璃珠编织土工织物界面，这些因素至少对本文研究的范围不敏感于法向应力。在峰值后的行为状态下，所有以土工纺织布为接触面的界面都表现出剪切强度的突然损失。最后，获得了角砂编织土工布，玻璃珠编织土工布和角砂粗化钢界面的统一应力-膨胀规律。 （C）2016 Elsevier Ltd.保留所有权利。

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