Macro-microscopic mechanical behavior of geogrid reinforced calcareous sand subjected to triaxial loads: Effects of aperture size and tensile resistance

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-02-23 DOI:10.1016/j.geotexmem.2024.01.006

Zhao-gang Luo , Xuan-ming Ding , Qiang Ou , Yi-wei Lu

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引用次数: 0

Abstract

Reinforcing calcareous sands with geogrids is a potentially effective method for large-scale geotechnical constructions in coastal lands. The breakable nature of polygonal calcareous sands determines the complex particle-geogrid interactions. A three-dimensional numerical model of geogrid reinforced calcareous sand (GRCS) was established to investigate the potential mechanical laws based on the discrete element method (DEM), and the reasonableness of the numerical model was verified by comparing with the indoor triaxial test. It follows that the macro-microscopic mechanical behavior of GRCS under the influence of aperture size and tensile resistance of geogrids was further investigated via effective DEM simulations. The presented results show that the decreased aperture size and increased tensile resistance are beneficial to enhance the macro-mechanical properties of GRCS, including strength, internal friction angle and pseudo cohesion. Particle crushing is mainly affected by shear strain and confining pressure. The bulging deformation of GRCS is partially suppressed due to the confining effect of geogrids. Besides, the source of strength enhancement of GRCS is revealed based on the microscopic particle-geogrid interactions, and the calculation method of horizontal and vertical additional stresses in the reinforced soil element considering the effects of tensile resistance and aperture size is further established.

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承受三轴载荷的土工格栅加固钙质砂的宏观-微观力学行为：孔径大小和抗拉强度的影响

用土工格栅加固钙质砂是沿海地区大规模岩土工程建设的一种潜在有效方法。多边形钙质砂的易破碎特性决定了颗粒与土工格栅之间复杂的相互作用。基于离散元法（DEM），建立了土工格栅加固钙质砂（GRCS）的三维数值模型来研究其潜在的力学规律，并通过与室内三轴试验的对比验证了数值模型的合理性。随后，通过有效的 DEM 仿真进一步研究了孔径大小和土工格栅抗拉性能影响下 GRCS 的宏观微观力学行为。结果表明，减小孔径和增加抗拉强度有利于提高 GRCS 的宏观力学性能，包括强度、内摩擦角和假内聚力。颗粒破碎主要受剪切应变和约束压力的影响。由于土工格栅的约束效应，GRCS 的隆起变形受到部分抑制。此外，基于微观颗粒-土工格栅相互作用揭示了 GRCS 强度增强的来源，并进一步建立了考虑抗拉强度和孔径大小影响的加筋土元件水平和垂直附加应力的计算方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.